"$on" in vue refers to a method, with syntax such as "Event.$on('msg',function(msg){...}", where the first parameter is the name of the data , corresponding to the name when sending, the second parameter is a method to operate on the data.
The operating environment of this tutorial: Windows7 system, vue2. Version 0, Dell G3 computer.
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$emit and $on
var Event = new Vue(); 相当于又new了一个vue实例,Event中含有vue的全部方法; Event.$emit('msg',this.msg); 发送数据,第一个参数是发送数据的名称,接收时还用这个名字接收,第二个参数是这个数据现在的位置; Event.$on('msg',function(msg){ 接收数据,第一个参数是数据的名字,与发送时的名字对应,第二个参数是一个方法,要对数据的操作 /这里是对数据的操作 })
Example:
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>孙三峰--博客园</title> <script type="text/javascript" src="js/vue2.0.3.js" ></script> <script type="text/javascript"> //准备一个空的实例对象 var Event = new Vue(); var A={ template:` <div style="border: 1px solid red; margin-bottom: 10px; width: 300px;"> <h4>A组件</h4> <p>{{a}}</p> <input type="button" value="把A数据给C" @click="send" /> </div> `, data(){ return { a:'我是A里面的数据' } }, methods:{ send(){ //A发送数据 Event.$emit('a-msg',this.a); } } }; var B={ template:` <div style="border: 1px solid green; margin-bottom: 10px; width: 300px;"> <h4>B组件</h4> <p>{{b}}</p> <input type="button" value="把B数据给C" @click="send" /> </div> `, data(){ return { b:'我是B里面的数据' } }, methods:{ send(){ Event.$emit('b-msg',this.b); } } }; var C={ template:` <div style="border: 1px dotted green; margin-bottom: 10px;width: 300px;"> <h4>我是C组件,我在坐等接收数据</h4> <p>{{a}}</p> <p>{{b}}</p> </div> `, data(){ return{ a:'', b:'' } }, mounted(){ //两种接收的方式 var _this = this; Event.$on('a-msg',function(a){ _this.a=a; }); Event.$on('b-msg',function(b){ this.b = b; }.bind(this)) } }; window.onload=function(){ new Vue({ el:'#box', data:{ }, components:{ 'com-a':A, 'com-b':B, 'com-c':C } }) } </script> </head> <body> <div id="box"> <com-a></com-a> <com-b></com-b> <com-c></com-c> </div> </body> </html>
Rendering:
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