元件通信-父子元件通信案例
這個案例中有一個問題，就是value未定義我也不知道怎麼解決
<!doctype html>
<html >
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div id="app">
<cpn :number1="num1"
:number2="num2"
@num1change="num1change"
@num2change="num2change"
></cpn>
</div>
<template id="cpn">
<div>
<h2>props:{{number1}}</h2>
<h2>data:{{dnumber1}}</h2>
<!--<input type="text" v-model="dnumber1">-->
<input type="text" v-bind:value="dnumber1" @input="num1input">
<h2>props:{{number2}}</h2>
<h2>data:{{dnumber2}}</h2>
<!--<input type="text" v-model="dnumber2">-->
<input type="text" v-bind:value="dnumber2" @input="num2input">
</div>
</template>
<script src="../../vue.min.js"></script>
<script>
const app=new Vue({
el:'#app',
data:{
message:'hello',
num1:1,
num2:0,
},
methods:{
num1change(){
this.num1=parseFloat(value)
},
num2change(){
this.num2=parseFloat(value)
}
},
components:{
cpn:{
template:'#cpn',
props:{
number1:Number,
number2:Number,
},
data(){
return{
dnumber1:this.number1,
dnumber2:this.number2,
}
},
methods:{
num1input(event){
//1.将input中的value指派到dnumber中
this.dnumber1=event.target.value
//2.為了讓父元件可以修改值，發出一個事件
this.$emit('num1change',this.number1)
//3.同時修改dnumber2的值
this.dnumber2=this.dnumber1*100;
this.$emit('num2change',this.dnumber2)
},
num2input(event){
this.dnumber2=event.target.value
this.$emit('num2change',this.number2)
//3.同時修改dnumber1的值
this.dnumber1=this.dnumber2/100;
this.$emit('num1change',this.dnumber1)
}
}
}
},
})
</script>
</body>
</html>
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