JS高级——面向对象方式解决tab栏切换问题

注意事项
1、给li元素注册事件，函数里面的this指的li元素，那么我们可以在注册事件之前将Tab对象用that=this进行保存
2、使用沙箱模式，所以暴露给外面的变量使用的是window.tab，将window作为参数传递进去
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <style>

        * {

            padding: 0;

            margin: 0;

        }

        .clearfix:after {

            content: '';

            visibility: hidden;

            display: block;

            clear: both;

        }

        .container {

            width: 800px;

            margin: 120px auto;

        }

        .tab {

            line-height: 40px;

        }

        .tab ul {

            width: 500px;

            list-style: none;

            border-top: 1px solid gray;

            border-left: 1px solid gray;

            border-right: 1px solid gray;

        }

        .tab ul li {

            float: left;

            width: 100px;

            height: 40px;

            text-align: center;

            position: relative;

        }

        .tab ul li:after {

            content: '';

            display: block;

            width: 1px;

            height: 14px;

            border-right: 1px solid gray;

            position: absolute;

            top: 13px;

            right: 0;

        }

        .tab ul li:nth-child(5):after {

            visibility: hidden;

        }

        .tab ul li.current {

            color: red;

        }

        .tab ul li.other {

            color: black;

        }

        .main {

            height: 500px;

            border: 1px solid gray;

        }

        .main div {

            height: 500px;

            text-align: center;

            line-height: 500px;

            font-size: 60px;

            display: none;

        }

        .main div.current {

            display: block;

        }

    </style>

</head>

<body>

<div class="container">

    <div class="tab">

        <ul class="clearfix" id="tab-menu">

            <li class="current">童装</li>

            <li>男装</li>

            <li>女装</li>

            <li>冬天</li>

            <li>夏天</li>

        </ul>

    </div>

    <div class="main" id="tab-main">

        <div class="current">童装</div>

        <div>男装</div>

        <div>女装</div>

        <div>冬天</div>

        <div>夏天</div>

    </div>

</div>

<script>

    (function (w) {

        function Tab(config) {

            this.tabMenus = null;

            this.tabMains = null;

            if (config) {

                this._init(config)

            }

        }

        Tab.prototype = {

            constructor: Tab,

            //初始化工作

            _init: function (config) {

                this.initElements(config);

                this.initEvent();

                if (config.auto) {

                    this.autoPlay();

                }

            },

            initEvent: function () {

                for (var i = 0; i < this.tabMenus.length; i++) {

                    var li = this.tabMenus[i];

                    li.index = i;

                    //that存储当前对象也就Tab创建出来的对象

                    var that = this;

                    li.onclick = function () {

                        //that还是只想Tab创建出来的对象

                        //this指的就是当前点击事件触发的这个li

                        that.change(this);

                    };

                }

            },

            initElements: function (config) {

                //根据config里的id

                //给当前对象的tabMenus和tabMains赋值

                var tabMenu = document.getElementById(config.tabMenu);

                var tabMain = document.getElementById(config.tabMain);

                this.tabMenus = tabMenu.children;

                this.tabMains = tabMain.children;

            },

            change: function (tabMenu) {

                //1.让所有的li变暗

                for (var i = 0; i < this.tabMenus.length; i++) {

                    this.tabMenus[i].className = "other";

                    //3.让所有div隐藏

                    this.tabMains[i].style.display = "none";

                }

                //2.让当前的li变亮

                tabMenu.className = 'current';

                //4.对应的div显示

                this.tabMains[tabMenu.index].style.display = "block";

            },

            autoPlay: function () {

                var index = 0;

                var that = this;

                setInterval(function () {

                    index++;

                    if (index == that.tabMenus.length) {

                        index = 0;

                    }

                    that.change(that.tabMenus[index]);

                }, 2000);

            }

        }

        w.Tab = Tab;

    })(window);

    var tb = new Tab({

        tabMenu: "tab-menu",    // 指定tab栏菜单id

        tabMain: "tab-main",    // 指定tab栏内容id

        auto: true           // 是否自动播放

    });

</script>

</body>

</html>
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JS高级——面向对象方式解决tab栏切换问题

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