newValue=app.fullName的值
计算属性的缓存
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="vue-2.5.21/dist/vue.js" type="text/javascript" charset="utf-8"></script>
<style>
</style>
</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>
</body>
<script type="text/javascript">
const app = new Vue({
el: "#app",
data: {
firstName: "Lebron",
lastName: "James",
},
computed: {
// 不用 get
fullName: {
// set不常用
set: function(newValue){
console.log(newValue);
const names = newValue.split(" ");
this.firstName = names[0];
this.lastName = names[1];
},
get: function(){
return this.firstName+" "+this.lastName;
}
}
},
methods: {
getFullName: function(){
return this.firstName+" "+this.lastName;
}
}
});
</script>
</html>