- 理解
在应用界面中, 某个(些)元素的样式是变化的
class/style绑定就是专门用来实现动态样式效果的技术
- class绑定: :class=‘xxx’
xxx是字符串
xxx是对象
xxx是数组
- style绑定
:style="{ color: activeColor, fontSize: fontSize + ‘px’ }"
其中activeColor和fontSize是data属性
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>class与style绑定</title>
<style>
.classA {
color: red;
}
.classB {
background: blue;
}
.classC {
font-size: 20px;
}
</style>
</head>
<body>
<div id="demo">
<h2>1. class绑定: :class='xxx'</h2>
<p :class="myClass">xxx是字符串</p>
<p :class="{classA: hasClassA, classB: hasClassB}">xxx是对象</p>
<p :class="['classA', 'classB']">xxx是数组</p>
<h2>2. style绑定</h2>
<p :style="{color:activeColor, fontSize}">:style="{ color: activeColor, fontSize: fontSize + 'px' }"</p>
<button @click="update">更新</button>
</div>
<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
new Vue({
el: '#demo',
data: {
myClass: 'classA',
hasClassA: true,
hasClassB: false,
activeColor: 'red',
fontSize: '20px'
},
methods: {
update () {
this.myClass = 'classB'
this.hasClassA = !this.hasClassA
this.hasClassB = !this.hasClassB
this.activeColor = 'yellow'
this.fontSize = '30px'
}
}
})
</script>
</body>
</html>