使用场景：当我们用v-model绑定了一个计算属性，想直接设置计算属性时，就要利用到setter
demo：
<template>
<div>
<div>First Name:
<el-input v-model="firstName" placeholder="请输入内容"></el-input>
</div>
<div>Second Name:
<el-input v-model="secondName" placeholder="请输入内容"></el-input>
</div>
<div>Full Name:
<el-input v-model="fullName" placeholder="请输入内容"></el-input>
</div>
</div>
</template>
export default{
data () {
return {
firstName: '',
secondName: ''
}
},
components: {},
computed: {
fullName: {
get: function () {
return this.firstName + ' ' + this.secondName
},
set: function (newVal) {
let names = newVal.split(' ')
this.firstName = names[0]
this.secondName = names[1]
}
}
}
}
实现的效果：firstName 、secondName 发生变化，fullName会自动更新；反过来，fullName的改变，firstName 和 secondName也会自动更新。
