vue中v-bind对样式的加强

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”
  1. 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
  2. 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

<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}">mannordiv>
        <div class="box" :class="['pink','big']">雷迪亚兹div>
    div>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/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
  <div id="app">
    <div class="box" :style="{width:'400px',height:'400px',backgroundColor:'green'}">div>
  div>

小demo–动态滑动条:

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>Documenttitle>
    <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/[email protected]/dist/vue.js">script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                precent: 0,
            }
        })
    script>
body>
html>

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