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>

posted @ 2018-01-28 09:43  var_obj  阅读(255)  评论(0)  编辑  收藏  举报