两个数相加，结果自动更新
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>两个数相加，结果自动显示</title>
</head>
<body>
<div id="box">
<input type="text" v-model="num1"> +
<input type="text" v-model="num2">
<h3 v-show="true">等于：{{countNum}}</h3>
</div>
<script src="js/vue.js"></script>
<script>
new Vue({
el: '#box',
data: {
num1: '',
num2: '',
},
computed:{
countNum:function() {
return parseInt(this.num1) + parseInt(this.num2)
}
}
});
</script>
</body>
</html>