<body>
<div id="root">
<h1>学生的基本信息</h1>
<button @click="student.age++">年龄+1岁</button>
<button @click="addsex">添加性别属性默认值是男</button><br>
<button @click="student.sex='未知' ">修改属性值</button><br>
<button @click="addfriend">在列表的首位就添加一个朋友</button><br>
<button @click="updatefriend">更新第一个人的名字</button><br>
<button @click="addhobby">添加一个爱好</button><br>
<button @click="change">修改第一个爱好为爬山</button><br>
<button @click="removesmoke">过滤掉抽烟</button><br>
<h3>姓名：{{student.name}}</h3>
<h3>年龄：{{student.age}}</h3>
<h3 v-if="student.sex">性别：{{student.sex}}</h3>
<h3>爱好：</h3>
<hr>
<ul>
<li v-for="(h,index) in student.hobby" :key="index">{{h}}</li>
</ul>
<hr>
<h3>朋友们：</h3>
<ul>
<li v-for="(f,index) in student.friends" :key="index">{{f.name}}--{{f.age}}</li>
</ul>
</div>
<script>
vue.config.productiontip = false;
const vm = new vue({
el: "#root ",
data: {
student: {
name: 'zhang',
age: 18,
hobby: ['喝酒', '抽烟', '烫头'],
friends: [{
name: 'li',
age: 15
}, {
name: 'wang',
age: 10
}]
}
},
methods: {
addsex() {
this.$set(this.student, 'sex', '男')
// vue.set(vm.student, 'sex', '男')
},
addfriend() {
this.student.friends.unshift({
name: 'yy',
age: 66
})
},
updatefriend() {
this.student.friends[0].name = "小刘";
this.student.friends[0].age = 22
},
addhobby() {
this.student.hobby.push('唱歌')
},
change() {
//splice添加表示从第0个开始，删除一个，新增加的值是爬山
//注意：不能直接通过数组下标的形式进行修改
//this.student.hobby.splice(0, 1, '爬山')
//vue.set(this.student.hobby, 0, '爬山')
this.$set(this.student.hobby, 0, '爬山')
},
removesmoke() {
//filter不影响原数组的改变
this.student.hobby = this.student.hobby.filter((h) => {
return h !== '抽烟'
})
}
}
})
</script>
</body>