Vue之动态绑定CSS样式

demo.html

 1 <!DOCTYPE html>
 2 <html lang="en" xmlns:v-bind="http://www.w3.org/1999/xhtml" xmlns:v-html="http://www.w3.org/1999/xhtml"
 3       xmlns:v-on="http://www.w3.org/1999/xhtml">
 4 <head>
 5     <meta charset="UTF-8">
 6     <title>Vue Demo</title>
 7     <!--自选版本-->
 8     <!--<script src="https://cdn.jsdelivr.net/npm/vue@2.5.21/dist/vue.js"></script>-->
 9     <!-- 开发环境版本，包含了有帮助的命令行警告 -->
10     <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
11     <!-- 生产环境版本，优化了尺寸和速度 -->
12     <!--<script src="https://cdn.jsdelivr.net/npm/vue"></script>-->
13     <link href="style.css" rel="stylesheet">
14 </head>
15 <body>
16 <div id="app">
17     <div>
18         <h2>动态绑定CSS样式</h2>
19         <div>
20             <h4>示例一</h4>
21             <div v-on:click="varChangeColor = !varChangeColor" v-bind:class="{changeColor:varChangeColor}">
22                 <span>点击切换颜色</span>
23             </div>
24 
25             <hr>
26             <h4>示例二</h4>
27             <button v-on:click="varChangeColor = !varChangeColor">改变颜色</button>
28             <button v-on:click="varChangeLength = !varChangeLength">改变长度</button>
29             <button v-on:click="varChangeLength = !varChangeLength,varChangeColor = !varChangeColor">两者都改变</button>
30             <!--computed属性封装对象-->
31             <div v-bind:class="computedClass">
32                 <span>测试内容</span>
33             </div>
34         </div>
35 
36     </div>
37 
38 
39 </div>
40 <script src="app.js"></script>
41 
42 
43 </body>
44 </html>

app.js

 1 var app = new Vue({
 2     el: '#app',
 3     data: {
 4         varChangeColor: false,
 5         varChangeLength: false,
 6     },
 7     methods: {},
 8 
 9     computed: {
10         computedClass: function () {
11             return {
12                 changeColor: this.varChangeColor,
13                 changeLength: this.varChangeLength
14             }
15         },
16     }
17 })

style.css

 1 span {
 2     background: red;
 3     display: inline-block;
 4     padding: 10px;
 5     color: #fff;
 6     margin: 10px 0;
 7 }
 8 
 9 .changeColor span {
10     background: green;
11 }
12 
13 .changeLength span:after {
14     content: "length";
15     margin-left: 10px;
16 }