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vue.js ???, ???? ??

善為 2019-01-31 11:52:11

1302

<!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>
</head>
<body>

<div id="box">
input里面輸入值，從而改變結(jié)果<br>
{{num1}}+<input type="text" v-model="num2">={{num3}}
</div>
<script src="js/Vue.js"></script>
<script>
new Vue({
el:'#box',
data:{
num1:'1',
num2:'2',
num3:''
},
watch:{
num2:function(){
return this.num3=Math.floor(this.num1)+Math.floor(this.num2);

}
}
})
</script>
</body>
</html>

??? ??????. ???? ? ? num3? ?? ?? ????? ??? ?? ????