<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div id="app">
<p v-if="isShow">holle world</p>
<p v-else>holle python</p>
</div> <script src="../js/vue.js"></script>
<script>
const app = new Vue({
el: "#app",
data:{
isShow:true,
},
methods:{ }
}) </script>
</body>
</html>
条件显示 v-show
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<!-- v-show 是样式上的修改 display:none -->
<!-- v-if dom元素直接不存在 -->
<!-- 显示和隐藏高频切换时用v-show -->
<div id="app">
<p v-show="isShow">holle world</p>
<p v-show="noShow">holle world</p> </div> <script src="../js/vue.js"></script>
<script>
const app = new Vue({
el: "#app",
data:{
isShow:true,
noShow:false,
},
methods:{ }
}) </script>
</body>
</html>
循环 v-for
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div id="app">
<ul>
<li v-for="(item, index) in names">{{index+1}} {{item}}</li>
</ul> <ul>
<li v-for="(item, key, index) in arr" :key="item">{{index}}.{{key}} :{{item}}</li>
</ul>
</div> <script src="../js/vue.js"></script>
<script>
const app = new Vue({
el: "#app",
data:{
names:["moon", "light", "is", "beautiful"],
arr:{
name:"moon",
age:18,
height:178,
weight:130
}
},
methods:{ }
}) </script>
</body>
</html>
用户切换
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<!-- 存在小问题， 在用户输入值后，切换方式，内容不会清空 可用key来做区别，不同的时候就不会复用-->
<div id="app">
<span v-if="isChange"><label for="账号">账号：</label><input id="username" type="text" placeholder="账号登录" key="username"></span>
<span v-else><label for="邮箱">邮箱：</label><input id="mail" type="text" placeholder="邮箱登录" key="mail"></span>
<input type="button" :value="value" @click="btmclick"></input>
</div> <script src="../js/vue.js"></script>
<script>
const app = new Vue({
el: "#app",
data:{
isChange:true,
},
methods:{
btmclick(){
this.isChange = !this.isChange
}
},
computed:{
value(){
if (this.isChange){
return "邮箱登录"
}
else{
return "账号登录"
}
}
} }) </script>
</body>
</html>
![2022-10-10：以下go语言代码输出什么？A：[1 2 3 0 1 2]；B：死循环；C：[1 2 3 1 2 3]；D：[1 2 3]。 package main import “fmt“](https://www.kunjuke.com/file/css/thumb/2.jpg/280-180.jpg)
