06.VUE学习之非常实用的计算属性computed实例

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<title>vue</title>
	<link rel="stylesheet" href="">
	<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
	<!-- <script type="text/javascript" src="../js/vue.js"></script> -->

</head>
<body>
	<div id="vue">
		<input type="text" v-model="n1">+
		<input type="text" v-model="n2">=
		<input type="text" v-model="sum">
	</div>
</body>
<script type="text/javascript">
	var app=new Vue({
		el:'#vue',
		computed:{
//		    写法一:
		    sum:function(){
		        //*1 是把字符串转为数字型 用this会从data里找变量
		        return this.n1*1+this.n2*1;
			}
//			写法二:
//			sum(){
//				return this.n1*1+this.n2*1
//			}
		},
		data:{
		  n1:0,
		  n2:0,
		}
	});
</script>
</html>
效果: