<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<button1></button1>
<button2></button2>
</div>
<script>
var bus = new Vue();
Vue.component(‘button1‘, {
template: `
<div>
<p>button1的值：{{ num }}</p>
<button @click="handle">点击使得btn2+1</button>
</div>
`,
data(){
return {
num: 0
}
},
methods: {
handle(){
bus.$emit("btn2", 1);
}
},
mounted(){
bus.$on("btn1", (val) => {
this.num += val;
});
}
});
Vue.component(‘button2‘, {
template: `
<div>
<p>button2的值：{{ num }}</p>
<button @click="handle">点击使得btn1+2</button>
</div>
`,
data(){
return {
num: 0
}
},
mounted() {
bus.$on("btn2", (val) => {
this.num += val;
});
},
methods: {
handle(){
bus.$emit("btn1", 2);
}
}
});
var vm = new Vue({
el: ‘#app‘,
data: {},
methods: {}
});
</script>
</body>
</html>
主要就是先创建一个vue实例（bus），然后其中一个组件在某个时刻触发（emit）事件,在另一个组件中监听（on）该事件的发生。
原文：https://www.cnblogs.com/liualex1109/p/12549538.html