vue学习第四天

时间：2019-10-14 17:24:56 阅读：65 评论：0 收藏：0 [点我收藏+]

一：路由跳转

this.$router.push(‘/course‘);
this.$router.push({name: course});
this.$router.go(-1);
this.$router.go(1);
<router-link to="/course">课程页</router-link>
<router-link :to="{name: ‘course‘}">课程页</router-link>

<template>
    <div class="nav">
        <ul>
            <li :class="{active: currentPage === ‘/‘}">
                <router-link to="/">主页</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course‘}">
                <router-link to="/course">课程</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course_detail‘}">
<!--                路由跳转-->
                <router-link :to="{name: ‘course_detail‘}">课程详情页</router-link>
            </li>
        </ul>
    </div>
</template>

<script>
    export default {
        name: "Nav"
    }
</script>

<style scoped>
    .nav {
        width: 100%;
        height: 60px;
        background-color: black;
    }

    .nav li {
        float: left;
        font: normal 20px/60px ‘微软雅黑‘;
        padding: 0 30px;
    }

    .nav li:hover {
        cursor: pointer;
        background-color: aquamarine;
    }

    .nav li.active {
        cursor: pointer;
        background-color: aquamarine;
    }
</style>

component组件层

<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav
        },
        data() {
            return {
                course_list
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
             gocourse_detail(){
            // this.$router.push({name:‘course_detail‘})
                    this.$router.push({name: ‘course_detail‘});
        }
        },



    }
</script>

<style scoped>

</style>

View页面层一

<template>
    <div class="">
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
    </div>
</template>

<script>

    import Nav from "../components/Nav";


    export default {
        name: ‘home‘,
        components: {
            Nav,

        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)  // 跳转到页面

                }
            },
            goBack() {
                this.$router.go(-1); // 返回上一页
                this.$router.go(-2);  // 返回上两页

                this.$router.go(1)  // 前进一页
            },
            gocourse_detail(){
                this.$router.push({name: ‘course_detail‘});  // 路由跳转
            }

        }
    }
</script>

View页面层二

二：路由传参

（1）方式一

<template>
    <div class="course-card">
        <h3 @click="goDetail">{{course.name}}</h3>
    </div>
</template>

<script>
    export default {
        name: "CourseCard",
        props: [‘course‘],
        methods:{
            goDetail(){
                this.$router.push({
                    name:‘course_detail‘,
                    query:{id:this.course.id},   // 页面刷新传参不会消失
                    params:{id:this.course.id}  //  页面刷新传参会消失
                })
            }
        }
    }
</script>


<style scoped>
    .course-card h3, .course-card a {
        width: 200px;
        height: 200px;
        border-radius: 50%;
        background-color: coral;
        font: normal 20px/200px ‘STSong‘;
        float: left;
        text-align: center;
        cursor: pointer;
        display: block;
    }
</style>

小组件一

<template>
    <div class="nav">
        <ul>
            <li :class="{active: currentPage === ‘/‘}">
                <router-link to="/">主页</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course‘}">
                <router-link to="/course">课程</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course_detail‘}">
<!--                路由跳转-->
                <router-link :to="{name: ‘course_detail‘}">课程详情页</router-link>
            </li>
        </ul>
    </div>
</template>

<script>
    export default {
        name: "Nav",
        data(){
            return{
                currentPage:‘‘
            }
        },
        created() {
            this.currentPage = this.$route.path
        }
    }
</script>

<style scoped>
    .nav {
        width: 100%;
        height: 60px;
        background-color: black;
    }

    .nav li {
        float: left;
        font: normal 20px/60px ‘微软雅黑‘;
        padding: 0 30px;
    }

    .nav li:hover {
        cursor: pointer;
        background-color: aquamarine;
    }

    .nav li.active {
        cursor: pointer;
        background-color: aquamarine;
    }
</style>

小组件二

<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程页</h2>
        <hr>
        <div>
            <CourseCard v-for="course in course_list" :key="course.name" :course="course"></CourseCard>
        </div>
    </div>
</template>

<script>
    import Nav from "../components/Nav";
    import CourseCard from ‘@/components/CourseCard‘

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav,
            CourseCard
        },
        data() {
            return {
                course_list
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});
            }
        },


    }
</script>

<style scoped>

</style>

页面渲染一

<template>
    <div>
        <Nav></Nav>

        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>

        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程详情页</h2>
        <hr>
        <p> {{course.name}} </p>
        <p> {{course.info}}</p>
        <p> {{course.price}}</p>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘,
            price: 6.66,
            info: ‘三分钟入门，一分钟入土！学了你不吃亏，不学你就废了！‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘,
            price: 3.66,
            info: ‘学习前端，忘掉所有痛苦！‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘,
            price: 5.22,
            info: ‘别做梦了！‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘,
            price: 80000,
            info: ‘就是他，错不了！‘
        },
    ];

    export default {
        name: "Course-detail",
        components: {
            Nav
        },
        data() {
            return {
                course: {},
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)
                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1);
            }
        },
        created() {

            let id = this.$route.query.id;  // 接受传参值
            // let id = this.$route.query.id;      // 接受传参值
            for (let courses of course_list) {  // 便利所有的值
                if (id == courses.id) {

                    this.course = courses;


                    break
                }
            }
        }
    }
</script>

<style scoped>

</style>

页面渲染二

<template>
    <div class="">
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>

        <button type="button" @click="goBack">页面前进返回</button>
        <h2>主页</h2>
        <hr>
    </div>
</template>

<script>

    import Nav from "../components/Nav";


    export default {
        name: ‘home‘,
        components: {
            Nav,

        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)  // 跳转到页面

                }
            },
            goBack() {
                this.$router.go(-1); // 返回上一页
                this.$router.go(-2);  // 返回上两页

                this.$router.go(1)  // 前进一页
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});  // 路由跳转
            }

        }
    }
</script>

页面渲染三

PS：

（1）query：传参的时候刷新页面传参数据不会消失

（2）params：传参的时候刷新页面数据会消失

（2）方式二

<template>
    <div class="nav">
        <ul>
            <li :class="{active: currentPage === ‘/‘}">
                <router-link to="/">主页</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course‘}">
                <router-link to="/course">课程</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course_detail‘}">
<!--                路由跳转-->
                <router-link :to="{name: ‘course_detail‘}">课程详情页</router-link>
            </li>
        </ul>
    </div>
</template>

<script>
    export default {
        name: "Nav",
        data(){
            return{
                currentPage:‘‘
            }
        },
        created() {
            this.currentPage = this.$route.path
        }
    }
</script>

<style scoped>
    .nav {
        width: 100%;
        height: 60px;
        background-color: black;
    }

    .nav li {
        float: left;
        font: normal 20px/60px ‘微软雅黑‘;
        padding: 0 30px;
    }

    .nav li:hover {
        cursor: pointer;
        background-color: aquamarine;
    }

    .nav li.active {
        cursor: pointer;
        background-color: aquamarine;
    }
</style>

小组件一

<template>
    <div class="course-card">
        <h3 @click="goDetail">{{course.name}}</h3>
    </div>
</template>

<script>
    export default {
        name: "CourseCard",
        props: [‘course‘],
        methods:{
            goDetail(){
                this.$router.push(
                    this.$router.push(`/course_detail/${this.course.id}`)  // 通过传参id 需要使用``这个双引号可以添加变量
                )
            }
        }
    }
</script>


<style scoped>
    .course-card h3, .course-card a {
        width: 200px;
        height: 200px;
        border-radius: 50%;
        background-color: coral;
        font: normal 20px/200px ‘STSong‘;
        float: left;
        text-align: center;
        cursor: pointer;
        display: block;
    }
</style>

小组件二

<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程页</h2>
        <hr>
        <div>
            <CourseCard v-for="course in course_list" :key="course.name" :course="course"></CourseCard>
        </div>
    </div>
</template>

<script>
    import Nav from "../components/Nav";
    import CourseCard from ‘@/components/CourseCard‘

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav,
            CourseCard
        },
        data() {
            return {
                course_list
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});
            }
        },


    }
</script>

<style scoped>

</style>

页面层一

<template>
    <div>
        <Nav></Nav>

        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>

        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程详情页</h2>
        <hr>
        <p> {{course.name}} </p>
        <p> {{course.info}}</p>
        <p> {{course.price}}</p>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘,
            price: 6.66,
            info: ‘三分钟入门，一分钟入土！学了你不吃亏，不学你就废了！‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘,
            price: 3.66,
            info: ‘学习前端，忘掉所有痛苦！‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘,
            price: 5.22,
            info: ‘别做梦了！‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘,
            price: 80000,
            info: ‘就是他，错不了！‘
        },
    ];

    export default {
        name: "Course-detail",
        components: {
            Nav
        },
        data() {
            return {
                course: {},
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)
                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1);
            }
        },
        created() {


            let id = this.$route.params.id;      // 接受传参值
            for (let courses of course_list) {  // 便利所有的值
                if (id == courses.id) {

                    this.course = courses;


                    break
                }
            }
        }
    }
</script>

<style scoped>

</style>

页面层二

<template>
    <div class="">
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>

        <button type="button" @click="goBack">页面前进返回</button>
        <h2>主页</h2>
        <hr>
    </div>
</template>

<script>

    import Nav from "../components/Nav";


    export default {
        name: ‘home‘,
        components: {
            Nav,

        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)  // 跳转到页面

                }
            },
            goBack() {
                this.$router.go(-1); // 返回上一页
                this.$router.go(-2);  // 返回上两页

                this.$router.go(1)  // 前进一页
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});  // 路由跳转
            }

        }
    }
</script>

页面层三

 {
      path: ‘/course_detail/:id‘,  // 类似于正则表达式
      name: ‘course_detail‘,
      component: course_detail
    },

路由层

PS：

（1）此种方式使用了正则表达式通过匹配正则传递的参数进行数据的筛选

三：VUE跨组件传参

（1）方式一：localstorage

    <template>
        <div class="course-card">
            <h3 @click="goDetail">{{course.name}}</h3>
        </div>
    </template>

    <script>
        export default {
            name: "CourseCard",
            props: [‘course‘],
            methods:{
                goDetail(){
                    this.$router.push(
                        {
                            name:‘course_detail‘,
                            query:{id:this.course.id}
                        }  // 通过传参id 需要使用``这个双引号可以添加变量
                    )
                }
            }
        }
    </script>


    <style scoped>
        .course-card h3, .course-card a {
            width: 200px;
            height: 200px;
            border-radius: 50%;
    background-color: coral;
            font: normal 20px/200px ‘STSong‘;
            float: left;
            text-align: center;
            cursor: pointer;
            display: block;
        }
    </style>

小组件一

<template>
    <div class="nav">
        <ul>
            <li :class="{active: currentPage === ‘/‘}">
                <router-link to="/">主页</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course‘}">
                <router-link to="/course">课程</router-link>
            </li>
            <li :class="{active: currentPage === ‘/course_detail‘}">
<!--                路由跳转-->
                <router-link :to="{name: ‘course_detail‘}">课程详情页</router-link>
            </li>
        </ul>
    </div>
</template>

<script>
    export default {
        name: "Nav",
        data(){
            return{
                currentPage:‘‘
            }
        },
        created() {
            this.currentPage = this.$route.path
        }
    }
</script>

<style scoped>
    .nav {
        width: 100%;
        height: 60px;
        background-color: black;
    }

    .nav li {
        float: left;
        font: normal 20px/60px ‘微软雅黑‘;
        padding: 0 30px;
    }

    .nav li:hover {
        cursor: pointer;
        background-color: aquamarine;
    }

    .nav li.active {
        cursor: pointer;
        background-color: aquamarine;
    }
</style>

小组件二

<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>{{cTitle}}</h2>
        <hr>
        <div>
            <CourseCard v-for="course in course_list" :key="course.name" :course="course"></CourseCard>
        </div>
    </div>
</template>

<script>
    import Nav from "../components/Nav";
    import CourseCard from ‘@/components/CourseCard‘

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav,
            CourseCard
        },
        data() {
            return {
                course_list,
                cTitle: ‘课程页‘
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});
            }
        },
        created() {
            localStorage.cTitle && (this.cTitle = localStorage.cTitle)
        }

    }
</script>

<style scoped>

</style>

页面层一

<template>
    <div>
        <Nav></Nav>

        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>

        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程详情页</h2>
        <p>
            主页:<input type="text" v-model="hTitle">
            <!--            点击修改主页的名称会发生改名-->
            <button @click="changehTitle">修改主页</button>
        </p>
        <p>
            课程页:<input type="text" v-model="cTitle">
            <!--            点击修改课程页的名称会发生改名-->
            <button @click="changecTitle"> 修改课程页</button>
        </p>
        <hr>
        <p> {{course.name}} </p>
        <p> {{course.info}}</p>
        <p> {{course.price}}</p>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘,
            price: 6.66,
            info: ‘三分钟入门，一分钟入土！学了你不吃亏，不学你就废了！‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘,
            price: 3.66,
            info: ‘学习前端，忘掉所有痛苦！‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘,
            price: 5.22,
            info: ‘别做梦了！‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘,
            price: 80000,
            info: ‘就是他，错不了！‘
        },
    ];

    export default {
        name: "Course-detail",
        components: {
            Nav
        },
        data() {
            return {
                course: {},
                hTitle: ‘‘,
                cTitle: ‘‘,
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)
                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1);
            },
            changehTitle() {
                this.hTitle && (localStorage.hTitle = this.hTitle);     // 只有this.hTitle为真（也就是输入的有值） 后面的才会成立


            },
            changecTitle() {
                this.cTitle && (localStorage.cTitle = this.cTitle)        // 只有this.cTitle为真（也就是输入的有值） 后面的才会成立
            },

        },
        created() {


            let id = this.$route.query.id;      // 接受传参值
            for (let courses of course_list) {  // 便利所有的值
                if (id == courses.id) {

                    this.course = courses;


                    break
                }
            }
        }
    }
</script>

<style scoped>

</style>

页面层二

<template>
    <div class="">
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>

        <button type="button" @click="goBack">页面前进返回</button>
        <h2>{{hTitle}}</h2>
        <hr>
    </div>
</template>

<script>

    import Nav from "../components/Nav";


    export default {
        name: ‘home‘,
        components: {
            Nav,

        },
        data() {
            return {
                hTitle: ‘主页‘

            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)  // 跳转到页面

                }
            },
            goBack() {
                this.$router.go(-1); // 返回上一页
                this.$router.go(-2);  // 返回上两页

                this.$router.go(1)  // 前进一页
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});  // 路由跳转
            }

        },
        created() {
            localStorage.hTitle && (this.hTitle = localStorage.hTitle)  // 如果localStorage有值 则使用仓库的 没有值使用默认值
        }
    }
</script>

页面层三

PS:

　　（1）上述课程详情页更改了主页与课程页面的名称且刷新之后课程名称不会更改为原有的

　　（2）localstorage存储的是永久的数据

（2）方式二：VUE仓库（store.js）

（1）

<template>
    <div>
        <Nav></Nav>
        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>
        <button type="button" @click="gocourse_detail(‘/course_detail‘)">跳转课程详情页面</button>
        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>{{cTitle}}</h2>
        <hr>
        <div>
            <CourseCard v-for="course in course_list" :key="course.name" :course="course"></CourseCard>
        </div>
    </div>
</template>

<script>
    import Nav from "../components/Nav";
    import CourseCard from ‘@/components/CourseCard‘

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘
        },
    ];

    export default {
        name: "course",
        components: {
            Nav,
            CourseCard
        },
        data() {
            return {
                course_list,
                cTitle: ‘课程页‘
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)

                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1)
            },
            gocourse_detail() {
                this.$router.push({name: ‘course_detail‘});
            }
        },
        created() {
                
                this.cTitle = this.$store.state.cTitle  // 获取仓库数据
        }

    }
</script>

<style scoped>

</style>

课程页

<template>
    <div>
        <Nav></Nav>

        <button type="button" @click="goPage(‘/course‘)">跳转课程页面</button>

        <button type="button" @click="goPage(‘/‘)">跳转主页</button>
        <button type="button" @click="goBack">页面前进返回</button>
        <h2>课程详情页</h2>
        <p>
            主页:<input type="text" v-model="hTitle">
            <!--            点击修改主页的名称会发生改名-->
            <button @click="changehTitle">修改主页</button>
        </p>
        <p>
            课程页:<input type="text" v-model="cTitle">
            <!--            点击修改课程页的名称会发生改名-->
            <button @click="changecTitle"> 修改课程页</button>
        </p>
        <hr>
        <p> {{course.name}} </p>
        <p> {{course.info}}</p>
        <p> {{course.price}}</p>
    </div>
</template>

<script>
    import Nav from "../components/Nav";

    let course_list = [
        {
            id: 1,
            name: ‘Python入门到入土‘,
            price: 6.66,
            info: ‘三分钟入门，一分钟入土！学了你不吃亏，不学你就废了！‘
        },
        {
            id: 2,
            name: ‘前端放弃攻略‘,
            price: 3.66,
            info: ‘学习前端，忘掉所有痛苦！‘
        },
        {
            id: 3,
            name: ‘你最棒，他最强‘,
            price: 5.22,
            info: ‘别做梦了！‘
        },
        {
            id: 4,
            name: ‘基佬修炼法则‘,
            price: 80000,
            info: ‘就是他，错不了！‘
        },
    ];

    export default {
        name: "Course-detail",
        components: {
            Nav
        },
        data() {
            return {
                course: {},
                hTitle: ‘‘,
                cTitle: ‘‘,
            }
        },
        methods: {
            goPage(path) {
                let current_path = this.$route.path;
                if (current_path != path) {
                    this.$router.push(path)
                }
            },
            goBack() {
                this.$router.go(-1);
                this.$router.go(1);
            },
            changehTitle() {
                this.hTitle && (localStorage.hTitle = this.hTitle);     // 只有this.hTitle为真（也就是输入的有值） 后面的才会成立


            },
            changecTitle() {
                console.log(this.$store);  // 查看仓库数据存储在哪个目录下
                this.$store.state.cTitle = this.cTitle;  // 数据更改

            },

        },
        created() {


            let id = this.$route.query.id;      // 接受传参值
            for (let courses of course_list) {  // 便利所有的值
                if (id == courses.id) {

                    this.course = courses;


                    break
                }
            }
        }
    }
</script>

<style scoped>

</style>

课程详情页

import Vue from ‘vue‘
import Vuex from ‘vuex‘
import cookies from ‘vue-cookies‘


Vue.use(Vuex);
Vue.use(cookies);
export default new Vuex.Store({
  state: {
      cTitle:‘课程页‘
  },
  mutations: {

  },
  actions: {

  }
})

store.js

PS:

　　（1）如上述课程详情页从仓库获取数据更改了课程页的名称

　　（2）刷新更改名称之后的页面页面名称又恢复之前的页面

　　（3）vue通过仓库存储的数据不会临时有效刷新就没了

（2）仓库插件

export default new Vuex.Store({
    state: {
        title: ‘默认值‘
    },
    mutations: {
        // mutations 为 state 中的属性提供setter方法
        // setter方法名随意，但是参数列表固定两个：state, newValue
        setTitle(state, newValue) {
            state.title = newValue;
        }
    },
    actions: {}
})

store.js

任意组件给变量赋值
this.$store.state.title = ‘newTitle‘
this.$store.commit(‘setTitle‘, ‘newTitle‘)

任意组件获取变量的值
console.log(this.$store.state.title)

（3）方式三：cookie

（1）安装

cnpm install vue-cookies  // 安装cookie插件

（2）配置

// 第一种
import cookies from ‘vue-cookies‘      // 导入插件
Vue.use(cookies);                    // 加载插件
new Vue({
    // ...
    cookies,                        // 配置使用插件原型 $cookies
}).$mount(‘#app‘);

// 第二种
import cookies from ‘vue-cookies‘    // 导入插件
Vue.prototype.$cookies = cookies;    // 直接配置插件原型 $cookies
PS：推荐使用第二种

<template>
    <div class="tst-page">
        <Nav></Nav>
        <h2>测试页面</h2>
        <p>
            <input type="text" v-model="token">
            <button @click="setToken">设置token</button>
        </p>
        <p>
            <button @click="getToken">获取token</button>
        </p>
        <p>
            <button @click="delToken">删除token</button>
        </p>
    </div>
</template>

<script>
    import Nav from ‘@/components/Nav.vue‘

    export default {
        name: "TestPage",
        components: {
            Nav
        },
        data() {
            return {
                token: ‘‘
            }
        },
        methods: {
            setToken() {
                if (this.token) {
                    let token = this.token;
                    this.$cookies.set(‘token‘, token, ‘1d‘); // 设置token 第一个参数是key 第二个参数是值 第三个参数是token生存时间 默认一天
                    console.log(token);
                    this.token = ‘‘
                }
            },
            getToken() {
                this.$cookies.get(‘token‘)  // 获取token
            },
            delToken() {
                this.$cookies.remove(‘token‘)  // 删除token
            },
        }
    }
</script>

<style scoped>

</style>

页面层

PS：

　　（1）token：用来认证的字符串

　　（2）产生：后台产生

　　（3）存储：后台存储（session表文件缓存）前台存储：cookie

　　（4）使用：服务器生成返回给前台前台进行认证的时候携带cookie进行认证

　　（5）前后台分离项目：后台生成token，返回给前台 => 前台自己存储，发送携带token请求 => 后台完成token校验 => 后台得到登陆用户

四：axios

（1）作用：前后台数据进行交互

（2）安装

cnpm install axios

（3）main.js

import axios from ‘axios‘

Vue.prototype.$axios = axios;

（3）

<template>
    <div class="tst-page">
        <Nav></Nav>
        <h2>测试页面</h2>
        <p>
            用户名称:
            <input type="text" v-model="username">
        </p>
        <p>
            用户密码:
            <input type="text" v-model="password">
        </p>
        <button type="button" @click="axiosAction">后台提交数据</button>

    </div>
</template>

<script>
    import Nav from ‘@/components/Nav.vue‘

    export default {
        name: "TestPage",
        components: {
            Nav
        },
        data() {
            return {
                username: ‘‘,
                password: ‘‘
            }
        },
        methods: {

            axiosAction() {
                // this.$axios({
                //     url: ‘http://127.0.0.1:8000/test/‘,  // 因为不在一个服务器必须写全路径
                //     method: ‘get‘,  // get请求
                //     params: {
                //         username: this.username,
                //         password: this.password,
                //     }
                // })
                this.$axios({
                        url: ‘http://127.0.0.1:8000/test/‘,  // 因为不在一个服务器必须写全路径
                        method: ‘post‘,  // get请求
                        params: {
                            username: this.username,
                            password: this.password,

                        }

                    },
                    this.username = ‘‘,
                    this.password = ‘‘
                )
                    .then(function (response) {  // 回调函数 成功
                        console.log(response)
                    }).catch(function (response) {
                    console.log(response)
                })
            },

        }

    }
</script>

<style scoped>

</style>

前段

五：域间同源问题

// 后台接收到前台的请求，可以接收前台数据与请求信息，发现请求的信息不是自身服务器发来的请求，拒绝响应数据，这种情况称之为 - 跨域问题（同源策略 CORS）

// 导致跨域情况有三种
// 1) 端口不一致
// 2) IP不一致
// 3) 协议不一致

// Django如何解决 - django-cors-headers模块
// 1) 安装：pip3 install django-cors-headers
// 2) 注册：
INSTALLED_APPS = [
    ...
    ‘corsheaders‘
]
// 3) 设置中间件：
MIDDLEWARE = [
    ...
    ‘corsheaders.middleware.CorsMiddleware‘
]
// 4) 设置跨域：
CORS_ORIGIN_ALLOW_ALL = True

六：element-ui插件

（1）安装：

>: cnpm i element-ui -S

（2）main.js配置

import ElementUI from ‘element-ui‘;
import ‘element-ui/lib/theme-chalk/index.css‘;
Vue.use(ElementUI);

vue学习第四天

标签：方法 comm 数列 smi 匹配行数据 store back 发送

原文地址：https://www.cnblogs.com/asdaa/p/11672552.html

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