计算属性的缓存
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<!--1.直接拼接:语法过于繁琐-->
<h2>{{firstName}} {{lastName}}</h2>
<!--2.通过定义methods-->
<h2>{{getFullName()}}</h2>
<!--3.通过computed-->
<h2>{{fullName}}</h2>
</div>
<script src="../js/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
firstName: 'Kobe',
lastName: 'Bryant'
},
methods: {
getFullName: function () {
return this.firstName+' '+this.lastName
}
},
computed: {
fullName: function () {
return this.firstName+' '+this.lastName
}
}
})
</script>
</body>
</html>
- 在多次循环使用时，methods时会多次调用，而computed只调用一次
