js运动 模仿淘宝幻灯

时间：2023-01-16 22:22:06
<!doctype html>

<html>

    <head>

    <meta charset="utf-8">

        <title>无标题文档</title>

        <style>

            *{

                margin:0;

                padding: 0;

            }

            #div1{

                width:600px;height:400px;border:1px solid #000;margin: 100px auto 0; position: relative;overflow:hidden;

            }

            #ul1{

                position: absolute;left: 0;top: 0;margin: 0;padding: 0;

            }

            li{

                list-style-type: none;float: left;

            }

            img{display: block;}

            #div1 p { text-align: center; position: absolute; width: 100%; bottom: 10px;}

            #div1 p span {padding: 2px 9px; background: #CCC; border-radius: 50%; margin-left: 5px; cursor: pointer;}

            #div1 p span.current { background:#F90;}

        </style>

        <script>

            window.onload = function (){

                var odiv = document.getElementById('div1');

                var oul = document.getElementById('ul1');

                var ali = oul.getElementsByTagName('li');

                var aspan = odiv.getElementsByTagName('span');

                var ilen = ali.length;

                var iwidth = ali[0].offsetWidth;

                oul.style.width = ilen * iwidth + 'px';

                for(var i = 0; i < ilen; i++)

                {

                    aspan[i].index = i;

                    aspan[i].onclick = function(){

                        for(var i = 0; i < ilen; i++)

                        {

                            aspan[i].className = '';

                        }

                        this.className = 'current';

                        startMove(oul, {

                            left : -this.index * iwidth

                        });

                    }

                }

            }

            function startMove(obj, json, fn) {

                clearInterval(obj.iTimer);

                var iCur = 0;

                var iSpeed = 0;

                obj.iTimer = setInterval(function() {

                    var iBtn = true;

                    for ( var attr in json ) {

                        var iTarget = json[attr];

                        if (attr == 'opacity') {

                            iCur = Math.round(css( obj, 'opacity' ) * 100);

                        } else {

                            iCur = parseInt(css(obj, attr));

                        }

                        iSpeed = ( iTarget - iCur ) / 8;

                        iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);

                        if (iCur != iTarget) {

                            iBtn = false;

                            if (attr == 'opacity') {

                                obj.style.opacity = (iCur + iSpeed) / 100;

                                obj.style.filter = 'alpha(opacity='+ (iCur + iSpeed) +')';

                            } else {

                                obj.style[attr] = iCur + iSpeed + 'px';

                            }

                        }

                    }

                    if (iBtn) {

                        clearInterval(obj.iTimer);

                        fn && fn.call(obj);

                    }

                }, 30);

            }

        function css(obj, attr) {

            if (obj.currentStyle) {

                return obj.currentStyle[attr];

            } else {

                return getComputedStyle(obj, false)[attr];

            }

        }

        </script>

    </head>

    <body>

        <div id = "div1">

            <ul id="ul1">

                <li><img src="img/5-1.jpg"></li>

                <li><img src="img/5-2.jpg"></li>

                <li><img src="img/5-3.jpg"></li>

                <li><img src="img/5-4.jpg"></li>

                <li><img src="img/5-5.jpg"></li>

                <li><img src="img/5-6.jpg"></li>

            </ul>

            <p>

            <span class="current"></span>

            <span></span>

            <span></span>

            <span></span>

            <span></span>

            <span></span>

            </p>

        </div>

    </body>

</html>

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