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给出一个简单的例子,讲述模板渲染的基础功能
在nodejs中使用express框架,默认的是ejs和jade渲染模板,以下是以ejs模板进行解析
1、ejs 模板安装
npm install ejs
目录安装好了之后,如何调用了,如下所示:
app.set("view engine","ejs");
2、默认的ejs模板只支持ejs为扩展名的文件,如果需要用html方式去书写,需要修改模板引擎,也就是express的engine函数
3、engine注册模板引擎的函数,处理指定的后缀名文件。
//修改模板文件的后缀名为html app.set("view engine","html"); //运行ejs模板 app.engine( ‘.html‘, require( ‘ejs‘ ).__express );
现在直接给一个渲染模板的例子:
1、在项目的目录下添加一个放静态文件的目录public以及放视图的文件夹views
2、在public目录下在添加三个存放js、css、img的目录,相应取名为javascripts、stylesheets、images。
3、在views中新建index.html,login.html,home.html三个页面
index.html文件内容如下:
<html> <header> <title>首页</title> <link href="/stylesheets/index.css" rel="stylesheet"> </header> <body> <div class="divMsg" style="text-align: center;"> <h2>欢迎来到首页</h2> <form action="#" role="form"> <div style=""> <input type="button" value="登录"> </div> </form> </div> <nav id="nav" class="nav-entry"> <div class="row"> <div class="col col-33"> <a id="c_hotel" title="酒店">酒店</a> </div> <div class="col col-33"> <a id="c_hotel_international" title="海外酒店">海外酒店</a> <a id="c_hotel_sale" title="特惠酒店">特惠酒店</a> </div> <div class="col col-33"> <a id="c_group" title="团购">团购</a> <a id="c_hotel_inn" title="客栈 公寓">客栈<span class="point">.</span>公寓</a> </div> </div> </nav> <div class="pic-banner"> <ul> <li> <a><img src="//webresource.c-ctrip.com/ResCRMOnline/R5/html5/images/zzz_pic_salead01.png" alt=""></a> </li> <li> <a><img src="http://images3.c-ctrip.com/rk/apph5/C1/201601/app_home_ad24_744_288.png" class="js_bottom" alt=""></a> </li> </ul> </div> </body> </html>
4、在stylesheets中新建index.css
index.css内容如下:
.row { display: -webkit-box; display: -webkit-flex; display: -moz-box; display: -moz-flex; display: -ms-flexbox; display: flex; width: 100%; -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box } .col { -webkit-box-flex: 1; -webkit-flex: 1; -moz-box-flex: 1; -moz-flex: 1; -ms-flex: 1; flex: 1; display: block; width: 100%; -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box } .col-33,.col-34 { -webkit-box-flex: 0; -webkit-flex: 0 0 33.3333%; -moz-box-flex: 0; -moz-flex: 0 0 33.3333%; -ms-flex: 0 0 33.3333%; flex: 0 0 33.3333%; max-width: 33.3333% } .nav-entry { padding: 5px; font-size: 15px } .nav-entry .row { margin-bottom: 5px; height: 6em } .nav-entry .row:last-of-type { margin-bottom: 0 } .nav-entry .col { border-left: 1px solid #fff; border-bottom: 1px solid #fff; height: 100% } .nav-entry .col a { height: 50% } .nav-entry .row:nth-child(1) .col a { background-color: #ff697a } .nav-entry .row:nth-child(2) .col a { background-color: #3d98ff } .nav-entry .row:nth-child(3) .col a { background-color: #44c522 } .nav-entry .row:nth-child(4) .col a { background-color: #fc9720 } .nav-entry .row:nth-child(1) .col:first-of-type a,.nav-entry .row:nth-child(2) .col:first-of-type a,.nav-entry .row:nth-child(3) .col:first-of-type a { height: 100% } .nav-entry .col a+a { border-top: 1px solid #fff } .nav-entry .col:first-of-type a { border-top-left-radius: 5px; border-bottom-left-radius: 5px } .nav-entry .col:last-of-type a:nth-child(1) { border-top-right-radius: 5px } .nav-entry .col:last-of-type a:nth-child(2) { border-bottom-right-radius: 5px } .nav-entry .row:nth-child(4) .col:first-of-type a:nth-child(1) { border-bottom-left-radius: 0 } .nav-entry .row:nth-child(4) .col:first-of-type a:nth-child(2) { border-top-left-radius: 0 } .nav-entry .col>a { position: relative; display: block; font-size: 1em; color: #fff; text-shadow: 0 2px 1px rgba(0,0,0,.2); text-align: center; line-height: 3em; box-sizing: border-box; overflow: hidden } .nav-entry .col>a em { font-style: normal; display: block; position: absolute; top: 50%; left: 50%; -webkit-transform: translate(-50%,-50%); -ms-transform: translate(-50%,-50%); -o-transform: translate(-50%,-50%); transform: translate(-50%,-50%); white-space: nowrap } .nav-entry .row:nth-child(1) .col:first-of-type a:after,.nav-entry .row:nth-child(2) .col:first-of-type a:after,.nav-entry .row:nth-child(3) .col:first-of-type a:after,.nav-entry .wallet,.nav-entry .ico_shadow { position: absolute; bottom: 10px; left: 50%; content: ""; background: url(//pic.c-ctrip.com/h5/home/un_ico_home_v66.png) 0 0 no-repeat; -webkit-background-size: 104px 326px; background-size: 104px 326px } .nav-entry li .ico_shadow { bottom: -12px; left: 0; width: 104px; height: 82px; background-position: 0 -30px } .nav-entry .row:nth-child(1) .col:first-of-type a:after { width: 40px; height: 33px; margin-left: -20px; background-position: 0 -130px } .nav-entry .row:nth-child(2) .col:first-of-type a:after { bottom: 15px; width: 43px; height: 28px; margin-left: -23px; background-position: -50px -120px } .nav-entry .row:nth-child(3) .col:first-of-type a:after { width: 35px; height: 43px; margin-left: -18px; background-position: 0 -180px } .nav-entry .wallet { bottom: 0; left: 0; width: 104px; height: 16px; text-align: center; line-height: 1.2; font-style: normal; font-size: 9px; color: #FF5F08; z-index: 3; background: url(//pic.c-ctrip.com/h5/home/tag_summer.png) 0 0 no-repeat; -webkit-background-size: 104px 17px; background-size: 104px 17px } .pic-banner { margin: 0 5px 5px 5px; -webkit-box-sizing: border-box; box-sizing: border-box } .pic-banner ul { display: table; width: 100%; border: 1px solid #d8d8d8; border-radius: 5px } .pic-banner li { -webkit-box-sizing: border-box; box-sizing: border-box; display: table-cell; width: 50% } .pic-banner li:first-child { border-right: 1px solid #d8d8d8 } .pic-banner img { width: 100%; min-height: 59px; vertical-align: middle } .pic-banner li:first-of-type a img { border-top-left-radius: 5px; border-bottom-left-radius: 5px } .pic-banner li:last-of-type a img { border-top-right-radius: 5px; border-bottom-right-radius: 5px }
在项目下新建app.js、内容如下:
var express=require("express"); var path=require("path"); var ejs=require(‘ejs‘); var app=express(); app.set("views",path.join(__dirname,"views")); app.set("view engine","html"); app.use(express.static(require(‘path‘).join(__dirname, ‘public‘))); app.engine(".html",ejs.__express); app.get("/",function(req,res){ res.render("index"); }); app.listen(8088);
render函数对模板进行渲染
格式为:res.render(view,[locals],callback);
参数view就是模板的文件名callback用来处理返回的渲染后的字符串,options、callback可省略,在渲染模板时locals可为其模板传入变量值,在模板中就可以调用所传变量了,在后面我们会讲述具体使用方法,也可先自行使用看其效果
备注:
在html文件中引用css的路径需要注意,例如index.html引用index.css样式代码为:
<link href="/stylesheets/index.css" rel="stylesheet">
为什么不从public目录开始了?那是因为代码中设置了启动静态文件的目录
app.use(express.static(require(‘path‘).join(__dirname, ‘public‘)));
代表从public目录下去查找静态资源,所以引入css不需要从public开始
目录结构如下图:
运行app.js,在浏览器输入地址http://127.0.0.1:8088/ 便可以看到浏览器加载了index.html网页的内容。
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原文地址:http://www.cnblogs.com/alice626/p/5149138.html