What does vue $on mean?
"$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.
Recommendation: "vue tutorial"
$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.$on('msg',function(msg){
接收数据，第一个参数是数据的名字，与发送时的名字对应，第二个参数是一个方法，要对数据的操作
/这里是对数据的操作
})Example:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>孙三峰--博客园</title>
<script type="text/javascript" src="js/vue2.0.3.js" ></script>
<script type="text/javascript">
//准备一个空的实例对象
var Event = new Vue();
var A={
template:`
<div style="border: 1px solid red; margin-bottom: 10px； width: 300px;">
<h4 id="A组件">A组件</h4>
<p>{{a}}</p>
<input type="button" value="把A数据给C" @click="send" />
</div>
`,
data(){
return {
a:'我是A里面的数据'
}
},
methods:{
send(){ //A发送数据
Event.$emit('a-msg',this.a);
}
}
};
var B={
template:`
<div style="border: 1px solid green; margin-bottom: 10px； width: 300px;">
<h4 id="B组件">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.$emit('b-msg',this.b);
}
}
};
var C={
template:`
<div style="border: 1px dotted green; margin-bottom: 10px；width: 300px;">
<h4 id="我是C组件-我在坐等接收数据">我是C组件,我在坐等接收数据</h4>
<p>{{a}}</p>
<p>{{b}}</p>
</div>
`,
data(){
return{
a:'',
b:''
}
},
mounted(){ //两种接收的方式
var _this = this;
Event.$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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