Correcting teacher:PHPz
Correction status:qualified
Teacher's comments:v-once用的比较少,<span v-once>{{username}}</span>
<script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
<!DOCTYPE html>
<html lang="zh-CN">
<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>挂载点, vue实例, 数据注入,响应式</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<!-- 1. 挂载点 -->
<div class="app">
<p>用户名: {{username}}</p>
</div>
<script>
// 2. vue 实例
const app = Vue.createApp({
// vue中的变量/数据全部写到data方法中
data() {
return {
username: "Help",
};
},
}).mount(".app"); // 默认调用,document.querySelector方法
// 将vue实例与页面中的挂载点元素绑定
// app.mount(document.querySelector(".app"))
console.log(app);
// 3. 数据注入
console.log(app.$data.username);
console.log(app.username);
// 用访问器属性来实现
const obj = {
$data: {
email: "Help10086@foxmail.com",
},
// 访问器属性
get email() {
return this.$data.email;
},
};
console.log(obj.$data.email);
console.log(obj.email);
// 4. 响应式,避免在原代码中修改
app.username = "DASHU";
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="zh-CN">
<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>v-text,v-html,v-once</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<!-- vue指令: v-为前缀的一组指令,写到html标签的属性位置上,本质上讲就是"自定义属性" -->
<div class="app">
<p>用户名: {{username}}</p>
<!-- v-text 相当于 textContent,内容必须是JS代码 -->
<p>用户名: <span v-text="username"></span></p>
<!-- v-html 相当于 innnerHTML -->
<p>用户名: <span v-html="username"></span></p>
<!-- v-once: 只渲染一次 -->
<p>用户名: <span v-once="username"></span></p>
</div>
<script>
const app = Vue.createApp({
data() {
return {
username: "10086",
};
},
}).mount(".app");
app.username = '<span style="color:red">500</span>';
app.username = "1000";
</script>
</body>
</html>
[http://help10086.cn/0113/demo3.html]
<!DOCTYPE html>
<html lang="zh-CN">
<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>样式绑定</title>
<script src="https://unpkg.com/vue@next"></script>
<style>
.active {
color: red;
}
.bgc {
background-color: lightgreen;
}
</style>
</head>
<body>
<div class="app">
<!-- 一: 样式绑定 v-bind, 简化: 冒号 -->
<!-- 行内样式 style -->
<p style="color: #ff0000">help10086.cn</p>
<p v-bind:style="style">help10086.cn</p>
<p style="color: #0000ff; background-color: #ffff00">help10086.cn</p>
<p :style="{color: textColor, backgroundColor: bgColor}">help10086.cn</p>
<!-- <button style="前面三个是基本样式,后面三个是定制样式"></button> -->
<button :style="[btnBase, btnCustom]">提交</button>
<!-- class样式 -->
<p :class="active">hello word!</p>
<p :class="{'active':isActive}">hello texhong!</p>
<p :class="['active', 'bgc']">hello jinyu!</p>
<p :class="[active , bgc]">hello viet nam!</p>
</div>
<script>
const app = Vue.createApp({
data() {
return {
style: "color:#0000ff",
textColor: "#008000",
bgColor: "#00ffff",
btnBase: {
width: "5em",
height: "2em",
border: "none",
},
btnCustom: {
backgroundColor: "seagreen",
color: "#ffffff",
cursor: "pointer",
},
active: "active",
isActive: false,
bgc: "bgc",
};
},
}).mount(".app");
</script>
</body>
</html>
[http://help10086.cn/0113/demo4.html]
<!DOCTYPE html>
<html lang="zh-CN">
<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>双向绑定</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<!-- es6 -->
<p>
<div>es6:</div>
<input type="text" oninput="this.nextElementSibling.textContent=this.value"><span></span>
</p>
<!-- vue -->
<div class="app">
<p>
<div>vue@input</div>
<!-- vue中的事件对象,使用 $event , 不能直接用 event -->
<input type="text" v-on:input="comment = $event.target.value" :value="comment"><span>{{comment}}</span>
</p>
<p>
<div>vue@v-model</div>
<!-- vue中的事件对象,使用 $event , 不能直接用 event -->
<input type="text" v-model="comment" :value="comment"><span>{{comment}}</span>
</p>
<!-- 延迟绑定 -->
<p>
<div>vue@v-model.lazy</div>
<input type="text" v-model.lazy="comment" :value="comment"><span>{{comment}}</span>
</p>
</div>
<script>
const app = Vue.createApp({
data() {
return {
comment: ''
}
}
}).mount('.app')
</script>
</body>
</html>
[http://help10086.cn/0113/demo5.html]