文章目录
- 创建Vue实例
- 插值表达式
- 响应式数据
- 常见标签
- v-html
- v-show v-if
- v-if v-else-if v-else
- v-on
- v-bind
- v-for
- v-model
- 综合案例
创建Vue实例
<!--创建Vue实例，初始化渲染1. 准备容器2. 引包（官网） — 开发版本/生产版本3. 创建Vue实例 new Vue()4. 指定配置项，渲染数据1. el:指定挂载点2. data提供数据
--><!-- Vue所管理的范围 -->
<div id="app"><!-- 这里将来会编写一些用于渲染的代码逻辑 --><h1>{{ msg }}</h1><a href="#">{{ count }}</a>
</div><!-- 引入的是开发版本包 - 包含完整的注释和警告 -->
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.16/dist/vue.js"></script><script>// 一旦引入 VueJS核心包，在全局环境，就有了 Vue 构造函数const app = new Vue({// 通过 el 配置选择器，指定 Vue 管理的是哪个盒子el: '#app',// 通过 data 提供数据data: {msg: 'xuge',count: 23}})</script>插值表达式
<!--插值表达式：Vue的一种模板语法作用：利用 表达式 进行插值渲染语法：{{ 表达式 }}注意点：1. 使用的数据要存在2. 支持的是表达式，不是语句 if for3. 不能在标签属性中使用 {{ }}--><div id="app"><p>{{ nickname }}</p><p>{{ nickname.toUpperCase() }}</p><p>{{ nickname + '你好' }}</p><p>{{ age >= 18 ? '成年' : '未成年' }}</p><p>{{ friend.name }}</p><p>{{ friend.desc }}</p><!-- -----------下面这三个是错误案例------------ --><!-- <p>{{ hobby }}</p> --><!-- <p>{{ if }}</p> --><!-- <p title="{{ nickname }}">我是p标签</p> --></div><script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {nickname: 'tony',age: 18,friend: {name: 'jepson',desc: '热爱学习 Vue'}}})</script>
响应式数据
<div id="app">{{ msg }}{{ count }}
</div><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {// 响应式数据 → 数据变化了，视图自动更新msg: '你好，旭哥',count: 23}})// data中的数据，是会被添加到实例(app)上// 1. 访问数据 实例.属性名// 2. 修改数据 实例.属性名 = 新值</script>
常见标签
v-html
<div id="app"><!-- 把data中得标签解析成html格式 --><div v-html="msg"></div>
</div><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {msg: `<h1>v-html</h1>` // 是 ` 不是单引号'}})
</script>
v-show v-if
<!--按 F12 可不可以看见v-show底层原理：切换 css 的 display: none 来控制显示隐藏v-if 底层原理：根据 判断条件 控制元素的 创建 和 移除（条件渲染）--><div id="app"><div v-show="flag" class="box">我是v-show控制的盒子</div><div v-if="flag" class="box">我是v-if控制的盒子</div></div><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script><script>const app = new Vue({el: '#app',data: {flag: true}})</script>
v-if v-else-if v-else
<!--注意： v-else 要和 v-if 一起使用
--><div id="app"><p v-if="gender == 2">性别：♂ 男</p><p v-else>性别：♀ 女</p><hr><p v-if="score >= 90">成绩评定A：奖励电脑一台</p><p v-else-if="score >= 70">成绩评定B：奖励周末郊游</p><p v-else-if="score >= 60">成绩评定C：奖励零食礼包</p><p v-else>成绩评定D：惩罚一周不能玩手机</p>
</div><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {gender: 2,score: 88}})
</script>
v-on
<!--v-on: 注册事件 = 添加监听 + 提供处理逻辑v-on:事件名 = "内联语句"v-on:事件名 = "处理函数"v-on:事件名 = "处理函数(实参)"例 v-on:click="处理逻辑" == @click="处理逻辑"
--><!-- 例子一 -->
<div id="app"><button @click="count--">-</button><span>{{ count }}</span><button v-on:click="count++">+</button>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {count: 100}})
</script><!-- 例子二 -->
<div id="app"><button @click="fn">切换显示隐藏</button><h1 v-show="isShow">黑马程序员</h1>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {isShow: true},methods: {fn () {// 让提供的所有methods中的函数，this都指向当前实例this.isShow = !this.isShow}}})
</script><!-- 例子三 -->
<div id="app"><div class="box"><h3>小黑自动售货机</h3><button @click="buy(5)">可乐5元</button><button @click="buy(10)">咖啡10元</button><button @click="buy(8)">牛奶8元</button></div><p>银行卡余额：{{ money }}元</p>
</div><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {money: 100},methods: {buy (price) {this.money -= price}}})
</script>
v-bind
<div id="app"><!-- v-bind:src == :src --><img v-bind:src="imgUrl" v-bind:title="msg" alt=""><img :src="imgUrl" :title="msg" alt="">
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {imgUrl: './imgs/10-02.png',msg: 'hello 波仔'}})
</script>
v-for
<div id="app"><h3>旭哥的书架</h3><ul><!-- 注意： 用 v-for的时候 :key 必须加 而且需要列表的id--><li v-for="(item, index) in booksList" :key="item.id"><span>{{ item.name }}</span><span>{{ item.author }}</span><!-- 注册点击事件 → 通过 id 进行删除数组中的 对应项 --><button @click="del(item.id)">删除</button></li></ul>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {booksList: [{id: 1, name: '《红楼梦》', author: '曹雪芹'},{id: 2, name: '《西游记》', author: '吴承恩'},{id: 3, name: '《水浒传》', author: '施耐庵'},{id: 4, name: '《三国演义》', author: '罗贯中'}]},methods: {del(id) {// 通过 id 进行删除数组中的 对应项 → filter(不会改变原数组)// filter: 根据条件，保留满足条件的对应项，得到一个新数组。this.booksList = this.booksList.filter(item => item.id !== id)}}})
</script>
删除列表某一项的操作 filter(item => item.id !== id) id是要删除的那一项的id（形参）
v-model
<div id="app"><!--v-model 可以让数据和视图，形成双向数据绑定(1) 数据变化，视图自动更新(2) 视图变化，数据自动更新可以快速[获取]或[设置]表单元素的内容-->账户：<input type="text" v-model="username"> <br><br>密码：<input type="password" v-model="password"> <br><br><button @click="login">登录</button><button @click="reset">重置</button>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {username: '',password: ''},methods: {login () {console.log(this.username, this.password)},reset () {this.username = ''this.password = ''}}})
</script>
综合案例
<!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"/><link rel="stylesheet" href="css/index.css"/><title>旭哥记事本</title>
</head>
<body><!-- 主体区域 -->
<section id="app"><!-- 输入框 --><header class="header"><h1>旭哥记事本</h1><input @keyup.enter="add" v-model="content" placeholder="请输入任务" class="new-todo"/><button v-on:click="add" class="add">添加任务</button></header><!-- 列表区域 --><section class="main"><ul class="todo-list"><!-- v-for="(item,index) in list" :key="item.id" --><li class="todo" v-for="(item,index) in list" :key="item.id"><div class="view"><span class="index">{{index + 1}}.</span><label>{{ item.name }}</label><button @click="del(item.id)" class="destroy"></button></div></li></ul></section><!-- 统计和清空 --><footer v-show="list.length > 0" class="footer"><!-- 统计 --><span class="todo-count">合 计:<strong> {{list.length}} </strong></span><!-- 清空 --><button @click="clear" class="clear-completed">清空任务</button></footer>
</section><!-- 底部 -->
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>const app = new Vue({el: '#app',data: {list: [{id: 1, name: '跑步一公里'},{id: 2, name: '游泳100米'},],content: ''},methods: {del(id) {// filter 保留所有不等于该 id 的项this.list = this.list.filter(item => item.id !== id)},clear() {this.list = []},add() {if (this.content.trim() === '') {alert("请输入内容")return}//unshift 添加到列表头部this.list.unshift({id: +new Date(), // 时间戳 保证id不重复name: this.content})this.content = ''}}})</script>
</body>
</html>index.css 代码如下
html,
body {margin: 0;padding: 0;
}
body {background: #fff;
}
button {margin: 0;padding: 0;border: 0;background: none;font-size: 100%;vertical-align: baseline;font-family: inherit;font-weight: inherit;color: inherit;-webkit-appearance: none;appearance: none;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;
}body {font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;line-height: 1.4em;background: #f5f5f5;color: #4d4d4d;min-width: 230px;max-width: 550px;margin: 0 auto;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;font-weight: 300;
}:focus {outline: 0;
}.hidden {display: none;
}#app {background: #fff;margin: 180px 0 40px 0;padding: 15px;position: relative;box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), 0 25px 50px 0 rgba(0, 0, 0, 0.1);
}
#app .header input {border: 2px solid rgba(175, 47, 47, 0.8);border-radius: 10px;
}
#app .add {position: absolute;right: 15px;top: 15px;height: 68px;width: 140px;text-align: center;background-color: rgba(175, 47, 47, 0.8);color: #fff;cursor: pointer;font-size: 18px;border-radius: 0 10px 10px 0;
}#app input::-webkit-input-placeholder {font-style: italic;font-weight: 300;color: #e6e6e6;
}#app input::-moz-placeholder {font-style: italic;font-weight: 300;color: #e6e6e6;
}#app input::input-placeholder {font-style: italic;font-weight: 300;color: gray;
}#app h1 {position: absolute;top: -120px;width: 100%;left: 50%;transform: translateX(-50%);font-size: 60px;font-weight: 100;text-align: center;color: rgba(175, 47, 47, 0.8);-webkit-text-rendering: optimizeLegibility;-moz-text-rendering: optimizeLegibility;text-rendering: optimizeLegibility;
}.new-todo,
.edit {position: relative;margin: 0;width: 100%;font-size: 24px;font-family: inherit;font-weight: inherit;line-height: 1.4em;border: 0;color: inherit;padding: 6px;box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);box-sizing: border-box;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;
}.new-todo {padding: 16px;border: none;background: rgba(0, 0, 0, 0.003);box-shadow: inset 0 -2px 1px rgba(0, 0, 0, 0.03);
}.main {position: relative;z-index: 2;
}.todo-list {margin: 0;padding: 0;list-style: none;overflow: hidden;
}.todo-list li {position: relative;font-size: 24px;height: 60px;box-sizing: border-box;border-bottom: 1px solid #e6e6e6;
}.todo-list li:last-child {border-bottom: none;
}.todo-list .view .index {position: absolute;color: gray;left: 10px;top: 20px;font-size: 22px;
}.todo-list li .toggle {text-align: center;width: 40px;/* auto, since non-WebKit browsers doesn't support input styling */height: auto;position: absolute;top: 0;bottom: 0;margin: auto 0;border: none; /* Mobile Safari */-webkit-appearance: none;appearance: none;
}.todo-list li .toggle {opacity: 0;
}.todo-list li .toggle + label {/*Firefox requires `#` to be escaped - https://bugzilla.mozilla.org/show_bug.cgi?id=922433IE and Edge requires *everything* to be escaped to render, so we do that instead of just the `#` - https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7157459/*/background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E');background-repeat: no-repeat;background-position: center left;
}.todo-list li .toggle:checked + label {background-image: url('data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E');
}.todo-list li label {word-break: break-all;padding: 15px 15px 15px 60px;display: block;line-height: 1.2;transition: color 0.4s;
}.todo-list li.completed label {color: #d9d9d9;text-decoration: line-through;
}.todo-list li .destroy {display: none;position: absolute;top: 0;right: 10px;bottom: 0;width: 40px;height: 40px;margin: auto 0;font-size: 30px;color: #cc9a9a;margin-bottom: 11px;transition: color 0.2s ease-out;
}.todo-list li .destroy:hover {color: #af5b5e;
}.todo-list li .destroy:after {content: '×';
}.todo-list li:hover .destroy {display: block;
}.todo-list li .edit {display: none;
}.todo-list li.editing:last-child {margin-bottom: -1px;
}.footer {color: #777;padding: 10px 15px;height: 20px;text-align: center;border-top: 1px solid #e6e6e6;
}.footer:before {content: '';position: absolute;right: 0;bottom: 0;left: 0;height: 50px;overflow: hidden;box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2), 0 8px 0 -3px #f6f6f6,0 9px 1px -3px rgba(0, 0, 0, 0.2), 0 16px 0 -6px #f6f6f6,0 17px 2px -6px rgba(0, 0, 0, 0.2);
}.todo-count {float: left;text-align: left;
}.todo-count strong {font-weight: 300;
}.filters {margin: 0;padding: 0;list-style: none;position: absolute;right: 0;left: 0;
}.filters li {display: inline;
}.filters li a {color: inherit;margin: 3px;padding: 3px 7px;text-decoration: none;border: 1px solid transparent;border-radius: 3px;
}.filters li a:hover {border-color: rgba(175, 47, 47, 0.1);
}.filters li a.selected {border-color: rgba(175, 47, 47, 0.2);
}.clear-completed,
html .clear-completed:active {float: right;position: relative;line-height: 20px;text-decoration: none;cursor: pointer;
}.clear-completed:hover {text-decoration: underline;
}.info {margin: 50px auto 0;color: #bfbfbf;font-size: 15px;text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);text-align: center;
}.info p {line-height: 1;
}.info a {color: inherit;text-decoration: none;font-weight: 400;
}.info a:hover {text-decoration: underline;
}/*Hack to remove background from Mobile Safari.Can't use it globally since it destroys checkboxes in Firefox
*/
@media screen and (-webkit-min-device-pixel-ratio: 0) {.toggle-all,.todo-list li .toggle {background: none;}.todo-list li .toggle {height: 40px;}
}@media (max-width: 430px) {.footer {height: 50px;}.filters {bottom: 10px;}
}
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