javascript 封裝的一個(gè)實(shí)用的焦點(diǎn)圖切換效果

更新時(shí)間：2010年07月14日 23:49:25 作者：

之前有一篇博客，實(shí)用的焦點(diǎn)圖切換效果，結(jié)構(gòu)行為相分離解釋的比較詳細(xì)，腳本是分離式的，但在易用性和重用性方面并不理想，這里原作者進(jìn)行了，優(yōu)化。

所以在原來(lái)的基礎(chǔ)上改了下，封裝起來(lái)，并做了進(jìn)一步的優(yōu)化，這樣同一個(gè)頁(yè)面就可以使用多個(gè)這樣的效果了，xhtm和css沒(méi)有變化，感興趣的朋友可以在js上面可以跟之前的代碼做個(gè)對(duì)比，這樣更容易理解和掌握。
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1.xhtml

復(fù)制代碼代碼如下:

<div class="jfocus">
    <div id="jfocuspic">
        <a href="#" style="display:block;">圖片一</a>
        <a href="#">圖片二</a>
        <a href="#">圖片三</a>
        <a href="#">圖片四</a>
    </div>
    <ul id="jfocusnum">
        <li class="on">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
    </ul>
</div>

2.css

復(fù)制代碼代碼如下:

.jfocus{width:300px;height:300px;border:#ccc 1px solid;background-color:#FFF;}#jfocuspic{FILTER: progid:DXImageTransform.Microsoft.Fade (duration=0.5,overlap=1.0 );width:300px;height:200px;overflow:hidden;}#jfocuspic a{display:none; font-size:2em; text-align:center; line-height:200px; font-weight:bold; background-color:#CCC; height:200px; cursor:pointer;}#jfocusnum li{cursor:pointer;height:50px; width:50px; line-height:50px;display:inline-block; color:#000; border:#999 1px solid; text-align:center; background-color:#CCC; float:left; margin:0 5px;}#jfocusnum li.on{color:#f00; font-weight:bold; border:#900 1px solid; font-size:14px;}

3.js

復(fù)制代碼代碼如下:

function $(id,tag){var re=(id&&typeof id!="string")?id:document.getElementById(id);if(!tag){return re;}else{return re.getElementsByTagName(tag);}}//獲取元素對(duì)象
function FocusImg(focbox,picobj,numbox,numobj,time){
var n=0;
var imglist=$(focbox,picobj);
var Num=$(numbox,numobj);
function setBg(value){for(var i=0;i<Num.length;i++) Num[i].className=(value==i)?"on":"";}//設(shè)置字母列表的樣式切換；
function plays(value){
if(document.all) $(focbox).filters[0].Apply();//濾鏡
for(i=0;i<Num.length;i++){i==value?imglist[i].style.display="block":imglist[i].style.display="none";}
if(document.all) $(focbox).filters[0].play();
}
function mouse(n){//設(shè)置鼠標(biāo)經(jīng)過(guò)和離開(kāi)后的事件；
    for(var i=0;i<Num.length;i++){
        (function(n){
        Num[i].onmouseover=imglist[i].onmouseover=function(){clearInterval(autoStart);Mea(n);}
        Num[i].onmouseout=imglist[i].onmouseout=function(){setAuto();}
        })(i);
    }
}
function Mea(value){n=value;mouse(n);setBg(value);plays(value);}
function auto(){n++;if(n>Num.length-1)n=0;    Mea(n);}
function setAuto(){autoStart=setInterval(function(){auto();},time)}
setAuto();
}

在xhtml后調(diào)用函數(shù)，并傳入對(duì)象參數(shù)：
<script type="text/javascript">FocusImg("jfocuspic","a","jfocusnum","li",3000);</script>
完整的演示代碼:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>封裝實(shí)用的焦點(diǎn)圖切換效果，分離式j(luò)s腳本</title> <style type="text/css"> .jfocus{width:300px;height:300px;border:#ccc 1px solid;background-color:#FFF;} #jfocuspic{FILTER: progid:DXImageTransform.Microsoft.Fade (duration=0.5,overlap=1.0 );width:300px;height:200px;overflow:hidden;} #jfocuspic a{display:none; font-size:2em; text-align:center; line-height:200px; font-weight:bold; background-color:#CCC; height:200px; cursor:pointer;} #jfocusnum li{cursor:pointer;height:50px; width:50px; line-height:50px;display:inline-block; color:#000; border:#999 1px solid; text-align:center; background-color:#CCC; float:left; margin:0 5px;} #jfocusnum li.on{color:#f00; font-weight:bold; border:#900 1px solid; font-size:14px;} </style> <script language="JavaScript" type="text/javascript"> function $(id,tag){var re=(id&&typeof id!="string")?id:document.getElementById(id);if(!tag){return re;}else{return re.getElementsByTagName(tag);}} function FocusImg(focbox,picobj,numbox,numobj,time){ var n=0; var imglist=$(focbox,picobj); var Num=$(numbox,numobj); function setBg(value){for(var i=0;i<Num.length;i++) Num[i].className=(value==i)?"on":"";} function plays(value){ if(document.all) $(focbox).filters[0].Apply(); for(i=0;i<Num.length;i++){i==value?imglist[i].style.display="block":imglist[i].style.display="none";} if(document.all) $(focbox).filters[0].play(); } function mouse(n){ for(var i=0;i<Num.length;i++){ (function(n){ Num[i].onmouseover=imglist[i].onmouseover=function(){clearInterval(autoStart);Mea(n);} Num[i].onmouseout=imglist[i].onmouseout=function(){setAuto();} })(i); } } function Mea(value){n=value;mouse(n);setBg(value);plays(value);} function auto(){n++;if(n>Num.length-1)n=0; Mea(n);} function setAuto(){autoStart=setInterval(function(){auto();},time)} setAuto(); } </script> </head> <body> <div   id="fx6q466"   class="jfocus"> <div   class="dgqh1lr"   id="jfocuspic"> <a href="#" style="display:block;">圖片一</a> <a href="#">圖片二</a> <a href="#">圖片三</a> <a href="#">圖片四</a> </div> <ul id="jfocusnum"> <li id="edytdcq"    class="on">1</li> <li>2</li> <li>3</li> <li>4</li> </ul> </div> <script type="text/javascript">FocusImg("jfocuspic","a","jfocusnum","li",3000);</script> </body> </html>

[Ctrl+A 全選注:引入外部Js需再刷新一下頁(yè)面才能執(zhí)行]

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