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接上篇,，這篇就實(shí)現(xiàn)可以自動(dòng)切換的切換效果,，用這種效果就可以做簡(jiǎn)單的焦點(diǎn)圖了。
說(shuō)明：
設(shè)置一個(gè)標(biāo)識(shí)數(shù)字置為0,，寫(xiě)一個(gè)每過(guò)幾秒標(biāo)識(shí)+1,執(zhí)行切換效果的函數(shù),，然后執(zhí)行。
當(dāng)標(biāo)識(shí)超過(guò)當(dāng)前選項(xiàng)卡長(zhǎng)度讓標(biāo)識(shí)置為0,。
在鼠標(biāo)移到選項(xiàng)卡的時(shí)候關(guān)閉定時(shí)器,，鼠標(biāo)移走的時(shí)候打開(kāi)定時(shí)器。
<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>無(wú)標(biāo)題文檔</title>
<style>
body,ul,li{margin:0; padding:0; font:12px/1.5 arial;}
ul,li{list-style:none;}
.wrap{width:500px; margin:20px auto;}
.hide{display:none;}
#tab_t{height:25px;border-bottom:1px solid #ccc;}
#tab_t li{float:left; width:80px; height:24px; line-height:24px; margin:0 4px; text-align:center; border:1px solid #ccc; border-bottom:none; background:#f5f5f5; cursor:pointer}
#tab_t .act{ position:relative; height:25px; margin-bottom:-1px; background:#fff;}
#tab_c{border:1px solid #ccc; border-top:none; padding:20px;}
</style>
<script>
window.onload = function(){ tab("tab_t","li","tab_c","div","onmouseover")
function tab(tab_t,tab_t_tag,tab_c,tag_c_tag,evt){
var tab_t = document.getElementById(tab_t);
var tab_t_li = tab_t.getElementsByTagName(tab_t_tag);
var tab_c = document.getElementById(tab_c);
var tab_c_li = tab_c.getElementsByTagName(tag_c_tag);
var len = tab_t_li.length;
var i=0;
var timer = null;
var num=0;
for(i=0; i<len; i++){
tab_t_li[i].index = i;
tab_t_li[i][evt] = function(){
clearInterval(timer);
num = this.index;
tab_change()
}
tab_t_li[i].onmouseout = function(){
autoplay();
}
}
function tab_change(){
for(i=0; i<len; i++){
tab_t_li[i].className = '';
tab_c_li[i].className = 'hide';
}
tab_t_li[num].className = 'act';
tab_c_li[num].className = '';
}
function autoplay(){
timer = setInterval(function(){
num++;
if(num>=len) num=0;
tab_change();
},1000);
}
autoplay();
}
}
</script>
</head> <body> <div class="wrap">
<ul id="tab_t">
<li class="act">選擇1</li>
<li>選擇2</li>
<li>選擇3</li>
<li>選擇4</li>
</ul>
<div id="tab_c">
<div>內(nèi)容1</div>
<div class="hide">內(nèi)容2</div>
<div class="hide">內(nèi)容3</div>
<div class="hide">內(nèi)容4</div>
</div>
</div>
</body>
</html>
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