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VueJS样式绑定v-bind:class

class 与 style 是 HTML 元素的属性,用于设置元素的样式,我们可以用 v-bind 来设置样式属性。

Vue.js v-bind 在处理 class 和 style 时, 专门增强了它。表达式的结果类型除了字符串之外,还可以是对象或数组。

动态切换多个 class

HTML

<!DOCTYPE html><html><head><meta charset="utf-8"><title>Vue 测试实例 - 菜鸟教程(runoob.com)</title><script src="https://cdn.bootcss.com/vue/2.2.2/vue.min.js"></script><style>.active {    width: 100px;    height: 100px;    background: green;}.text-danger {    background: red;}</style></head><body><div id="app">  <div class="static"     v-bind:class="{ active: isActive, ‘text-danger‘: hasError }">  </div></div><script>new Vue({  el: #app,  data: {    isActive: true,    hasError: true  }})</script></body></html>

text-danger 类背景颜色覆盖了 active 类的背景色.实际渲染后如下:

<div class="static active text-danger"></div>

 

将样式绑定到对象

HTML:

<!DOCTYPE html><html><head><meta charset="utf-8"><title>Vue 测试实例 - 菜鸟教程(runoob.com)</title><script src="https://cdn.bootcss.com/vue/2.2.2/vue.min.js"></script><style>.active {    width: 100px;    height: 100px;    background: green;}.text-danger {    background: red;}</style></head><body><div id="app">  <div v-bind:class="classObject"></div></div><script>new Vue({  el: #app,  data: {    classObject: {      active: true,      text-danger: true    }  }})</script></body></html>

以上效果都是一样的,如下图:

技术分享

computed 对象属性

HTML

<!DOCTYPE html><html><head><meta charset="utf-8"><title>Vue 测试实例 - 菜鸟教程(runoob.com)</title><script src="https://cdn.bootcss.com/vue/2.2.2/vue.min.js"></script><style>.active {    width: 100px;    height: 100px;    background: green;}.text-danger {    background: red;}</style></head><body><div id="app">  <div v-bind:class="classObject"></div></div><script>new Vue({  el: #app,  data: {  isActive: true,  error: null  },  computed: {    classObject: function () {      return {        active: this.isActive && !this.error,        text-danger: this.error && this.error.type === fatal,      }    }  }})</script></body></html>

效果为绿色。

数组语法[]

<!DOCTYPE html><html><head><meta charset="utf-8"><title>Vue 测试实例 - 菜鸟教程(runoob.com)</title><script src="https://cdn.bootcss.com/vue/2.2.2/vue.min.js"></script><style>.active {    width: 100px;    height: 100px;    background: green;}.text-danger {    background: red;}</style></head><body><div id="app">    <div v-bind:class="[activeClass, errorClass]"></div></div><script>new Vue({  el: #app,  data: {    activeClass: active,    errorClass: text-danger  }})</script></body></html>

效果为红色。

三元表达式

<!DOCTYPE html><html><head><meta charset="utf-8"><title>Vue 测试实例 - 菜鸟教程(runoob.com)</title><script src="https://cdn.bootcss.com/vue/2.2.2/vue.min.js"></script><style>.text-danger {    width: 100px;    height: 100px;    background: red;}.active {    width: 100px;    height: 100px;    background: green;}</style></head><body><div id="app">    <div v-bind:class="[errorClass ,isActive ? activeClass : ‘‘]"></div></div><script>new Vue({  el: #app,  data: {    isActive: true,    activeClass: active,    errorClass: text-danger  }})</script></body></html>

效果为绿色。

 

VueJS样式绑定v-bind:class