JS横向左右切换的焦点图特效

2017-05-14 网页编程网 网页编程网

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
* { padding: 0; margin: 0; }
li { list-style: none; }
body { background: #f6f9fc; }
div { width: 660px; height: 254px; border: 1px solid #ccc; margin: 50px auto 0; overflow:hidden; }
ul { width: 3300px; height: 254px; }
ul li { width: 22px; height: 254px; float: left; position: relative; overflow:hidden; }
.active { width: 550px; }
ul span { width: 21px; height: 244px; padding-top: 10px; border-right: 1px solid #fff; position: absolute; top: 0; right: 0; color: #fff; font-size: 12px; text-align: center; cursor: pointer; }
ul img { width: 550px; height: 254px; }
.bg0 { background: #00FFCC; }
.bg1 { background: #636363; }
.bg2 { background: #3d7fbb; }
.bg3 { background: #5ca716; }
.bg4 { background: #f28b24; }
.bg5 { background: #7c0070; }
</style>
<script type="text/javascript">
var g_aLis = [];
var g_aBtns = [];
var g_oTimer = null;
var g_minWidth = 22;
window.onload = function() {
    var a = document.getElementById('show1');
    var i = 0;
    g_aLis = a.getElementsByTagName('li');
    g_aBtns = a.getElementsByTagName('span');
    for (i = 0; i < g_aBtns.length; i++) {
        g_aBtns[i].index = i;
        g_aBtns[i].onmouseover = function() {
            gotoImg(this.index)
        }
    }
};
function gotoImg(a) {
    if (g_oTimer) {
        clearInterval(g_oTimer)
    }
    g_oTimer = setInterval("changeWidthInner(" + a + ")", 35)
}
function changeWidthInner(a) {
    var b = document.getElementById('show1');
    var c = 660;
    var w = 0;
    var d = true;
    var i = 0;
    for (i = 0; i < g_aLis.length; i++) {
        if (i == a) {
            continue
        }
        if (g_minWidth == g_aLis[i].offsetWidth) {
            c -= g_aLis[i].offsetWidth;
            continue
        }
        d = false;
        speed = Math.ceil((g_aLis[i].offsetWidth - g_minWidth) / 10);
        w = g_aLis[i].offsetWidth - speed;
        if (w <= g_minWidth) {
            w = g_minWidth
        }
        g_aLis[i].style.width = w + 'px';
        c -= w
    }
    g_aLis[a].style.width = c + 'px';
    if (d) {
        clearInterval(g_oTimer);
        g_oTimer = null
    }
}
</script>
</head>

<body>
<div>
    <ul id="show1">
        <li class="active">
            <span class="bg0">这是第一个</span>
            <img src="/skins/iad1.jpg">
        </li>
        <li>
            <span class="bg1">这是第二个</span>
            <img src="/skins/iad2.jpg">
        </li>
        <li>
            <span class="bg2">这是第三个</span>
            <img src="/skins/iad3.jpg">
        </li>
        <li>
            <span class="bg3">这是第四个</span>
            <img src="/skins/iad4.jpg">
        </li>
        <li>
            <span class="bg4">这是第五个</span>
            <img src="/skins/iad5.jpg">
        </li>
        <li>
            <span class="bg5">这是第六个</span>
            <img src="/skins/iad6.jpg">
        </li>
    </ul>
</div>
</body>
</html>

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