JS函数传参实例应用：多组图片切换实例

<div class="box" id="pic1">
        <img src="" />
        <span>数量正在加载中……</span>
        <p>文字说明正在加载中……</p>
        <ul></ul>
    </div>

    <div class="box" id="pic2">
        <img src="" />
        <span>数量正在加载中……</span>
        <p>文字说明正在加载中……</p>
        <ul></ul>
</div>

<style>
    ul { padding:0; margin:0; }
    li { list-style:none; }
    .box { width:400px; height:500px; position:relative;
        float: left;margin-right:60px; background:url(img/loader_ico.gif) no-repeat center #fff; }
    .box img { width:400px; height:500px; }
    .box ul { width:40px; position:absolute; top:0; right:-50px; }
    .box li { width:40px; height:40px; margin-bottom:4px; background:#666; }
    .box .active { background:#FC3; }
    .box span { top:0; }
    .box p { bottom:0; margin:0; }
    .box p,.box span { position:absolute; left:0; width:400px; height:30px; line-height:30px; text-align:center; color:#fff; background:#000; }
</style>

<script>
    window.onload = function(){
        fnTab("pic1",["img/pic1.jpg","img/pic2.jpg","img/pic3.jpg","img/pic4.jpg"],["图1","图2","图3","图4"],"onclick");
        fnTab("pic2",["img/pic4.jpg","img/pic2.jpg","img/pic1.jpg","img/pic4.jpg"],["图4","图2","图3","图1"],"onmouseover")
    };

    function fnTab(id,arrImg,arrPtxt,evt){
        var oDiv=document.getElementById(id);
        var oImg=oDiv.getElementsByTagName("img")[0];
        var oUl=oDiv.getElementsByTagName("ul")[0];
        var aLi=oUl.getElementsByTagName("li");
        var oSpan=oDiv.getElementsByTagName("span")[0];
        var oPtxt=oDiv.getElementsByTagName("p")[0];
        var num=0;

        //在ul里追加li，li的数量等于数组的长度
        for(var i=0;i<arrImg.length;i++){
            oUl.innerHTML += "<li></li>";
        }

        //初始化
            function fn(){
                 oImg.src=arrImg[num];
                 oPtxt.innerHTML=arrPtxt[num];
                 oSpan.innerHTML=1+num+"/"+arrImg.length;
                for(var i=0;i<aLi.length;i++){
                    aLi[i].className="";
                }
                aLi[num].className="active"
            }
            fn();

        for(var i=0;i<aLi.length;i++){//循环li
            aLi[i].index=i;//索引值，当前li等于i
            aLi[i][evt]=function(){
                num = this.index;
                fn();
            }

        }

    }

</script>