2019.8.27更新：《Vue.js实战一书p231练习试做（3）

const install=function(Vue,opotions={}){
    const ajax=new Vue({
        data(){
            return{
                options:null,
                data:‘‘,
                type:‘GET‘,
                url:‘‘,
                success:function(){},
                error:function(){},
                xhr:null
                
            };
        },
        methods:{
            initialize(options){
                this.setOptions(options);
                //this.data=this.setData(this.options.data);
                this.data=this.options.data;
                this.type=this.options.type;
                this.url=this.options.url;
                this.success=this.options.success;
                this.error=this.options.error;
                this.xhr=this.createXHR();
                this.start();
            },
            setOptions(options){
                this.options={
                    type:‘GET‘,
                    data:‘‘,
                    success:function(mes){alert(mes)},
                    error:function(mes){alert(mes)},
                    url:‘‘
                };
                Object.assign(this.options,options);
                //for(var p in options) this.options[p]=opotions[p];
            },
            //把传入的数据设置为key1=value1&key2=value2格式的字符串，如果
            //是使用FormData对象生成数据，则可以不用，不然会出错
            setData(data){
                let localdata=[];
                for(let i in data){
                    localdata.push(encodeURIComponent(i) +
                    ‘=‘+encodeURIComponent(data[i]));
                }
                localdata=localdata.join(‘&‘);
                return localdata;
            },
            createXHR(){
                const _this=this;
                const xhr = new XMLHttpRequest();
                xhr.onreadystatechange=function(){
                    if(xhr.readyState==4){
                        const status=xhr.status;
                        if(status>=200 && status<300){
                            _this.success &&
                            _this.success(xhr.responseText);
                        }else{
                            _this.error &&
                            _this.error(status);
                        }
                    }
                };
                return xhr;
            },
            get(url){
                this.xhr.open(‘get‘,url+‘?‘+this.data,true);
                this.xhr.send(null);
            },
            post(url,mes){
                this.xhr.open(‘post‘,url,true);
                //this.xhr.setRequestHeader(‘Content-Type‘, ‘application/x-www-form-urlencoded‘);
                this.xhr.send(mes);
            },
            start(){
                switch(this.type.toUpperCase()){
                    case ‘GET‘:
                        this.get(this.url);
                        break;
                    case ‘POST‘:
                        this.post(this.url,this.data);
                        break;
                }
            }
        },
        created(){
            this.initialize();
        }
    });
    Vue.prototype.$ajax=ajax;
};
export default install;

import VueAjax from ‘./components/vue-ajax‘;

Vue.use(VueAjax);

<template>
  <div id="app">
    <form id="user-info">
        <label for="user-name">Name:</label><input type="text" id="user-name" name="user-name" /><br />
        <label for="user-email">Email:</label><input type="text" id="user-email" name="user-email" /><br />
        <input type="button" value="Submit" @click="submitData" />
    </form>
  </div>
</template>
<script>
export default {
  methods:{
    submitData(){
      var form=document.getElementById(‘user-info‘);
      var objs={
        type:‘post‘,
        url:‘postexample.php‘,
        data:new FormData(form)
      }
      this.$ajax.initialize(objs);
    }
  },
  
}
</script>

this.$ajax.initialize(objs);
this.$ajax.get(‘example.txt‘);
this.$ajax.post(‘postexample.php‘,new FormData(form));