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HomeWeb Front-endJS TutorialDetailed explanation of EJS template engine examples

Detailed explanation of EJS template engine examples

Jun 24, 2017 pm 02:51 PM
javascriptenginetemplate

前面的话

  nodejs的模板引擎有很多, EJS是比较简单和容易上手的。本文将详细介绍EJS

 

概述

  EJS是一个简单高效的模板语言,通过数据和模板,可以生成HTML标记文本。可以说EJS是一个JavaScript库,EJS可以同时运行在客户端和服务器端,客户端安装直接引入文件即可,服务器端用npm包安装

【安装】

  ejs可以配合express框架使用,或直接在node中/浏览器中使用

$ npm install ejs

【特点】

  1、快速编译和渲染

  2、简单的模板标签

  3、自定义标记分隔符

  4、支持文本包含

  5、支持浏览器端和服务器端

  6、模板静态缓存

  7、支持express视图系统

 

用法

nbsp;html>


    <meta>
    <title>Document</title>


<div></div>
<script></script>
<script>var html = ejs.render(&#39;<%=123 %>&#39;,&#39;&#39;);
    document.getElementById(&#39;div1&#39;).innerHTML = html;</script>

 

方法

【ejs.compile(str,[option])】

  编译字符串得到模板函数,参数如下

str:需要解析的字符串模板
option:配置选项
var template = ejs.compile('');var result = template();
console.log(result);//123

【ejs.render(str,data,[option])】

  直接渲染字符串并生成html,参数如下

str:需要解析的字符串模板
data:数据
option:配置选项
var result = ejs.render('');
console.log(result);//123

  两个函数包括的配置选项参数options如下:

cache 缓存编译后的函数(ejs.compile(..) ,需要 filename参数作为缓存的key
filename 用于缓存的key,和include
context 函数的执行上下文
compileDebug 输出compile的信息来跟踪调试
client 返回编译后的函数
delimiter  指这里的%debug 输出ejs.compile()得到函数的函数体
strict ejs.compile()返回的函数是否执行在严格模式
_with 是否使用 with(){..} 来访问本地变量
localsName 保存本地变量的对象名,默认为locals
rmWhitespace 移除多余空格

 

常用标签

【js】

  所有使用 括起来的内容都会被编译成 Javascript,可以在模版文件中像写js一样Coding

//test.ejs
//test.jsvar ejs = require('ejs');var fs = require('fs');var data = fs.readFileSync('test.ejs');var result = ejs.render(data.toString());
console.log(result);//123

  或者,像下面这样写

var ejs = require('ejs');var result = ejs.render('');
console.log(result);//123

【变量】

  用输出变量,变量若包含 '' '&'等字符会被转义

var ejs = require('ejs');var result = ejs.render('',{a:'<div>123</div>'});
console.log(result);//<div>123</div>

  如果不希望变量值的内容被转义,那就这么用输出变量

var ejs = require('ejs');var result = ejs.render('',{a:'<div>123</div>'});
console.log(result);//<div>123</div>

【注释】

  用来注释,不执行不输出

【include】

  include 可以引用绝对路径或相对路径的模板文件

//test.ejs
//test.jsvar ejs = require('ejs');var result = ejs.render('');//throw new Error('`include` use relative path requires the \'filename\' option.');console.log(result);

  由上面的提示可知,使用相对路径时,必须设置'filename'选项

//test.ejs
//test.jsvar ejs = require('ejs');var result = ejs.render('',{filename:'test.ejs'});
console.log(result);//123

  

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