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js实现百度联盟中一款不错的图片切换效果完整实例

2018-10-12 14:04 1216 查看

本文实例讲述了js实现百度联盟中一款不错的图片切换效果的方法。分享给大家供大家参考。具体实现方法如下：

<html>

<title>js实现百度联盟中的一个不错的图片切换效果</title>

<body>

<script>

var links = new Array();

links[1] = "http://www.baidu.com/";

links[2] = "//www.jb51.net/";

links[3] = "http://www.sohu.com/";

links[4] = "http://sc.jb51.net/";

var imgs = new Array();

for(var n = 1; n <= 5; n++) imgs
 = new Image();

imgs[1].src = "images/m01.jpg";

imgs[2].src = "images/m02.jpg";

imgs[3].src = "images/m03.jpg";

imgs[4].src = "images/m04.jpg";

var tits = new Array();

tits[1] ="百度搜索";

tits[2] = "脚本之家";

tits[3] = "搜狐主页";

tits[4] = "素材之家";

var imgwidth = 550;//图片宽度

var imgheight = 134;//图片宽度

var str = "<style type='text/css'>";

str += "#imgnv{display:none;position:absolute;bottom:-1px;right:0;height:16px;}#imgnv div{float:left;margin-right:1px;}";

str += "#imgnv div.on,#imgnv div.off{margin-bottom:1px;width:30px;height:15px;line-height:18px!important;line-height:15px;font-size:9px;text-align:center;cursor:pointer;cursor:hand}";

str += "#imgnv div.on{background:#CE0609;color:#FFF;font-weight:bold}";

str += "#imgnv div.off{background:#323232;color:#FFF;text-decoration:none}";

str += "#titnv{margin-top:3px;color:#000;text-align:center;display:none;}";

str += "</style>";

str += "<div style='position:relative'>";

str += "<div><a id='dlink' href='" + links[1] + "' target='_blank'><img id='dimg' src='" + imgs[1].src + "' border='0' width='" + imgwidth + "' height='"+imgheight+"' style='filter:Alpha(opacity=100)' onmouseover='Pause(true)' onmouseout='Pause(false)'></a></div>";

//修改点1：循环添加内层div内容以增加个数

str += "<div id='imgnv'><div id='it1' class='on' onmouseover='ImgSwitch(1, true)' onmouseout='Pause(false)'>1</div><div id='it2' class='off' onmouseover='ImgSwitch(2, true)' onmouseout='Pause(false)'>2</div><div id='it3' class='on' onmouseover='ImgSwitch(3, true)' onmouseout='Pause(false)'>3</div><div id='it4' class='off' onmouseover='ImgSwitch(4, true)' onmouseout='Pause(false)'>4</div></div>";

str += "<div id='titnv'><b>" + tits[1] + "</b></div>";

str += "</div>";

document.write(str);

var oi = document.getElementById("dimg");

var pause = false;

var curid = 1;

var lastid = 1;

var sw = 1;

var opacity = 100;

var speed = 15;

var delay = (document.all)? 400:700;

function SetAlpha(){

if(document.all){

if(oi.filters && oi.filters.Alpha) oi.filters.Alpha.opacity = opacity;

}else{

oi.style.MozOpacity = ((opacity >= 100)? 99:opacity) / 100;

}

}

function ImgSwitch(id, p){

if(p){

pause = true;

opacity = 100;

SetAlpha();

}

oi.src = imgs[id].src;

document.getElementById("dlink").href = links[id];

document.getElementById("it" + lastid).className = "off";

document.getElementById("it" + id).className = "on";

document.getElementById("titnv").innerHTML = "<b>" + tits[id] + "</b>";

curid = lastid = id;

}

function ScrollImg(){

if(pause && opacity >= 100) return;

if(sw == 0){

opacity += 2;

if(opacity > delay){ opacity = 100; sw = 1; }

}

if(sw == 1){

opacity -= 3;

if(opacity < 10){ opacity = 10; sw = 3; }

}

SetAlpha();

if(sw != 3) return;

sw = 0;

curid++;

//修改点2：这里的4也是个数

if(curid > 4) curid = 1;

ImgSwitch(curid, false);

}

function Pause(s){

pause = s;

}

function StartScroll(){

setInterval(ScrollImg, speed);

}

function CheckLoad(){

if (imgs[1].complete == true && imgs[2].complete == true) {

clearInterval(checkid);

setTimeout(StartScroll, 2000);

}

}

var checkid = setInterval(CheckLoad, 10);

</script>

</body>

</html>

希望本文所述对大家的javascript程序设计有所帮助。

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