1、添加对象某个属性
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Vue.set()的使用</title><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
<div id="root"><h2>学校地址：{{address}}</h2><h2>学校名称：{{name}}</h2><hr/><h1 >学生信息</h1><button @click="addsex">点击添加学生性别</button><h2>学生名字：{{student.name}}</h2><h2 v-if="student.sex">性别：{{student.sex}}</h2><h2>学生真实年龄：{{student.age.rage}}</h2><h2>学生对外年龄：{{student.age.sage}}</h2><h2>学生朋友们</h2><h2><ul><li v-for="(p,index) in student.friends" :key="index"> {{p.name}}--{{p.age}}</li></ul></h2>
</div>
<script type="text/javascript">Vue.config.productionTip=false;const vm = new Vue({el:"#root",data:{address:'尚硅谷',name:'北京',student:{name: 'tom',age:{rage:40,sage:29},friends:[{name:'jeery',age:35},{name:'tony',age:36}]}},methods:{addsex(){Vue.set(this.student,'sex','男')}}})
</script>
</body>
</html>
2、另外一种写法
this.$set(this.student,'sex','男');
