子组件通过 $emit 触发父组件的方法时，如果需要传递参数，可在方法名后面加可选参数，参数以逗号隔开。
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>子组件通过 $emit 触发父组件的方法时，如果需要传递参数，可在方法名后面加可选参数，参数以逗号隔开。title>
head>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js">script>
<body>
<div id="app">
<div id="app">
<input v-model="par">
<button-counter v-on:love="incrementTotal" v-bind:message="par">button-counter><br/>
div>
div>
body>
<script>
Vue.component('button-counter', {
props:['message'],
template: `{{ message }}
`,
data: function () {
return {
par:'',
}
},
methods: {
incrementHandler: function (v){
this.message = +this.message;
if (v == 1) {
this.message -= 1
this.$emit('love', 1)
} else {
this.message += 1
this.$emit('love', 2)
}
}
},
})
new Vue({
el: '#app',
data: {
par:'',
},
methods: {
incrementTotal: function (par) {
if (par == 2) {
console.log(123)
this.par += 1
} else {
console.log(456)
this.par -= 1
}
console.log(this.par,"tttt");
}
}
})
script>
html>
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