Vue-18、Vue更新数据时的一个问题
1、修改凑效
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>更新时的一个问题</title>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
<div id="root">
<h2>人员列表</h2>
<button @click="updatemei">更新马冬梅的信息</button>
<ul>
<li v-for="p in persons" :key="p.id">
{{p.name}}-{{p.age}}-{{p.sex}}
</li>
</ul>
</div>
<script type="text/javascript">
Vue.config.productionTip=false;
new Vue({
el:"#root",
data:{
message:'请输入名字搜索',
keyword:'',
persons:[
{id:'1',name:'马冬梅',age:30,sex:'女'},
{id:'2',name:'周冬雨',age:35,sex:'女'},
{id:'3',name:'周杰伦',age:18,sex:'男'},
{id:'4',name:'文兆伦',age:19,sex:'男'},
],
},
methods:{
updatemei(){
this.persons[0].name='马老师';
this.persons[0].age='50';
this.persons[0].sex='男';
}
}
})
</script>
</body>
</html>
2、修改失败
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>更新时的一个问题</title>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
<div id="root">
<h2>人员列表</h2>
<button @click="updatemei">更新马冬梅的信息</button>
<ul>
<li v-for="p in persons" :key="p.id">
{{p.name}}-{{p.age}}-{{p.sex}}
</li>
</ul>
</div>
<script type="text/javascript">
Vue.config.productionTip=false;
new Vue({
el:"#root",
data:{
message:'请输入名字搜索',
keyword:'',
persons:[
{id:'1',name:'马冬梅',age:30,sex:'女'},
{id:'2',name:'周冬雨',age:35,sex:'女'},
{id:'3',name:'周杰伦',age:18,sex:'男'},
{id:'4',name:'文兆伦',age:19,sex:'男'},
],
},
methods:{
updatemei(){
// this.persons[0].name='马老师';
// this.persons[0].age='50';
//this.persons[0].sex='男';
this.persons[0]= {id:'1',name:'马老师',age:50,sex:'男'};
}
}
})
</script>
</body>
</html>
当点击按钮时的的确确把内存中persons中的第一个修改了,但是vue并没有监测到本次变化。