Vue—v-for与v-model的使用
1.v-for结合实例使用<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Title</title></head><body><div id="app"><span>{{user.name}}{{
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1.v-for结合实例使用
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<span>{{user.name}}{{user.age}}</span>
<hr>
<!-- 通过v-for遍历对象-->
<!-- <span v-for="u in user">-->
<!-- {{u}}//输出整个对象-->
<!-- </span>-->
<!-- <span v-for="(key,value,index) in user">-->
<!-- {{index}}:{{key}}:{{value}}-->
<span v-for="(key,value) in user">
{{value}}:{{key}}
</span>
<!-- 通过v-for遍历数组
:key="user.id"便于内部做重用和排序
-->
<hr>
<ul>
<li v-for="a in list">{{a}}</li>
</ul>
<hr>
<ul>
<li v-for="user,index in userlist" :key="user.id">
{{index+1}}
{{user.id}}
{{user.name}}
{{user.age}}
{{user.aihao}}
</li>
</ul>
<!-- 通过v-for遍历数组中的对象-->
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
const app = new Vue({
el: "#app",
data: {
user:{name:"小文",age:22},
list:["广东","四川","成都"],
userlist:[
{id:1,name:"wenxin1",age:"18",aihao:"编程1"},
{id:2,name:"wenxin2",age:"18",aihao:"编程2"},
{id:3,name:"wenxin3",age:"18",aihao:"编程3"},
{id:4,name:"wenxin4",age:"18",aihao:"编程4"},
]
},
methods: {}
})
</script>
</body>
</html>
</html>```
2.v-model：用来绑定标签元素的值与vue实例对象中data数据保持一致，从而**实现双向数据绑定(表单中的数据导致vue实例data数据变化，vue实例data数据变化导致表单数据变化)**
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<input type="text" v-model="message">
<hr>
<span>{{message}}</span>
<hr>
<input type="button" value="点我改变data中message的值" @click="change">
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
const app = new Vue({
el: "#app",
data: {
message:""
},
methods: {
change(){
this.message="wenwenwen"
}
}
})
</script>
</body>
</html>
3.MVVM架构 双向绑定机制
model： 数据，vue实例中绑定的数据
vm：ViewModel 监听器
view ：页面，页面展示的数据
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