v-bind对样式的加强
为了方便开发者进行样式控制,Vue扩展了v-bind的语法,可以针对class类名和style行内样式进行控制。
操作class
- 语法 :class = "对象/数组"
-
对象→**键就是类名,值是布尔值。**如果值为true,有这个类,否则没有这个类
- 适用场景:一个类名来回切换
-
数组 →数组中所有的类,都会添加到盒子上,本质就是一个class列表
html
<head>
<style>
.box {
width: 200px;
height: 200px;
border: 3px solid #000;
font-size: 30px;
margin-top: 10px;
}
.pink {
background-color: pink;
}
.big {
width: 300px;
height: 300px;
}
</style>
</head>
<body>
<div id="app">
<div class="box" :class="{pink:true ,big:true}">mannor</div>
<div class="box" :class="['pink','big']">雷迪亚兹</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
}
})
</script>
</body>
</html>
操作style
- 语法 :style = "样式对象"
- 适用场景:某个具体属性的动态设置
html
<div id="app">
<div class="box" :style="{width:'400px',height:'400px',backgroundColor:'green'}"></div>
</div>
小demo--动态滑动条:
html
<!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">
<title>Document</title>
<style>
.progress {
height: 25px;
width: 400px;
border-radius: 15px;
background-color: #272425;
border: 3px solid #272425;
box-sizing: border-box;
margin-bottom: 30px;
}
.inner {
width: 50%;
height: 20px;
border-radius: 10px;
text-align: right;
position: relative;
background-color: #409eff;
background-size: 20px 20px;
box-sizing: border-box;
transition: all 1s;
}
.inner span {
position: absolute;
right: -20px;
bottom: -25px;
}
</style>
</head>
<body>
<div id="app">
<div class="progress">
<div class="inner" :style="{width:precent+'%'}">
<span>{{precent}}%</span>
</div>
</div>
<button @click="precent=25">设置25%</button>
<button @click="precent=50">设置50%</button>
<button @click="precent=75">设置75%</button>
<button @click="precent=100">设置100%</button>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
precent: 0,
}
})
</script>
</body>
</html>