JS实现Tab栏切换的两种方式案例详解

面向过程的写法

<!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>
        *{
            padding: 0;
            margin: 0;
        }
        div{
            width: 500px;
            border: 1px solid red;
        }
        ul{
            overflow: hidden;
        }
        ul>li{
            list-style: none;
            float: left;
            width: 50px;
            text-align: center;
        }
        div>div{
            height: 300px;
            background-color: pink;
            text-align: center;
            font-size: 50px;
        }
        #lastBox{
            display: none;
        }
        .selected{
            background-color: orange;
        }
    </style>
</head>
<body>
    <div>
        <ul>
            <li id="first" class="selected">1</li>
            <li id="last">2</li>
        </ul>
        <div id="firstBox">11111</div>
        <div id="lastBox">222222</div>
    </div>
    <script>
       var lis =  document.querySelectorAll('ul>li')
       var content =  document.querySelectorAll('div>div')
       //藏值  通过属性来保存对应的值   通过对应的对象来藏
       //加所有li添加点击事件
       for(var i=0;i<lis.length;i++){
            // lis[i].setAttribute('data-index',i)
            lis[i].index = i
            lis[i].onclick = function(){
                //排他思想 先将所有的全部设置一个值 然后再给自己设置一个值
                for(var j=0;j<lis.length;j++){
                    lis[j].className = ""
                }
                this.className = "selected"
                //排他
                //先将其他的都隐藏 再给自己显示
                for(var j=0;j<content.length;j++){
                    content[j].style.display = "none"
                }
                // document.getElementById(this.id+'Box').style.display = 'block'
                // content[this.getAttribute('data-index')].style.display = 'block'
                content[this.index].style.display = 'block'
            }
       }
    </script>
</body>
</html>

面向对象的写法

<!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>
        *{
            margin: 0;
            padding: 0;
        }
        #box{
            width: 400px;
            height: 400px;
            border: 2px solid pink;
            margin: 0 auto;
        }
        ul{
            display: flex;
            margin: 0 auto;
            width: 400px;
            position: relative;
        }
        ul>li{
            list-style: none;
            width: 100px;
            height: 50px;
            font-size: 40px;
            text-align: center;
            border: 1px solid white;
            background-color: yellow;

        }
        ul .showli{
            background-color: orange;
        }
        #box div{
            width: 400px;
            height: 350px;
            position: absolute;
            display: none;
        }

        #box .show{
            display: block;
            background-color: rgb(0, 183, 255);
            font-size: 80px;
            text-align: center;
        }
    </style>
</head>
<body>
    <div id="box">
        <ul>
            <li class="showli">1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
        </ul>

        <div class="show">1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
    </div>
    <script>
        //用面向对象的思维写tab栏切换
        //属性：选项框，选项框对应要切换的页面
        class Tab{
            constructor(ele){
                this.box = document.getElementById(ele);
                this.lis = this.box.querySelectorAll('ul > li');
                this.divs = this.box.querySelectorAll('div');
            }

            change()
            {
                // console.log(this.box);
                // console.log(this.lis);
                // console.log(this.divs);

                for(var i = 0; i < this.lis.length; i++)
                {
                    //保存当前this指向
                    var _this = this;
                    //保存每一个li的下标，便于切换指定div
                    this.lis[i].index = i;
                    //每一个li添加点击事件
                    this.lis[i].onclick = function()
                    {

                        //排他，清空所有li与盒子的类名
                        for(var j = 0; j < _this.lis.length; j++)
                        {
                            _this.lis[j].className = "";
                            _this.divs[j].className = "";
                        }
                        //单独设置点击的li类名，让其样式和其余未被点击的li不同
                        this.className = "showli";

                        //检查当前li的下标是否成功保存
                        // console.log(this.index);

                        //让li对应的div显示出来
                        _this.divs[this.index].className = "show";
                    }

                }
            }
        }

        var tab = new Tab("box");
        tab.change();

    </script>
</body>
</html>

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