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                        /前端開發
                        
                            /JavaScript
                        
                        /JS+CSS3實現帶預覽圖幻燈片效果

switchSlider 為什么不能正常顯示圖片，求指教

<!DOCTYPE html>
<html>
<head>
?? ?<title>幻燈片</title>
?? ?<meta charset="utf-8">
?? ?<script type="text/javascript" src="jquery-1.11.0.min.js"></script>
?? ?<style type="text/css">
?? ?*{margin:0;padding:0;}
?? ?body{
?? ??? ?font-size: 14px;color: #555;
?? ??? ?/*字體抗鋸齒*/
?? ??? ?font-smoothing: antialiased;
?? ??? ?-webkit-font-smoothing: antialiased;
?? ?}
?? ?.slider,.slider .main,.slider .main .main-i{width: 100%;height: 400px;position: relative;}
?? ?/*幻燈片內容區域*/
?? ?.slider .main{overflow: hidden;}
?? ?.slider .main .main-i img{width:100%;position: absolute;left: 0;top:0;}
?? ?.slider .main .main-i .caption{position: absolute;left: 20%;top:30%;}
?? ?.slider .main .main-i .caption h2{font-size: 40px;color: #b5b5b5;text-align: right;line-height: 50px;}
?? ?.slider .main .main-i .caption h3{font-size: 70px;color: #000000;line-height: 70px;text-align: right;font-family: '幼圓'}
?? ?/*控制按鈕區域*/
?? ?.slider .ctrl{width: 100%;height: 13px;line-height: 13px;position: absolute;bottom:-13px;text-align: center;}
?? ?.slider .ctrl .ctrl-i{display: inline-block;width: 150px;height: 13px;background-color: #666;box-shadow: 0 1px 1px rgba(0,0,0,.3);position: relative;margin-left: 1px;}
?? ?.slider .ctrl .ctrl-i img{width: 100%;position: absolute;left: 0;bottom: 50px;z-index: 1;opacity: 0;transition:all .2s;}
?? ?/*hover 控制按鈕的樣式*/
?? ?.slider .ctrl .ctrl-i:hover{background-color: #f0f0f0;}
?? ?.slider .ctrl .ctrl-i:hover img{bottom: 13px;opacity: 1;
?? ??? ?/*倒影*/
?? ??? ?-webkit-box-reflect:below 0 -webkit-gradient(
?? ??? ??? ?linear,
?? ??? ??? ?left top,
?? ??? ??? ?left bottom,
?? ??? ??? ?from(transparent),
?? ??? ??? ?color-stop(50%,transparent),
?? ??? ??? ?to(rgba(255,255,255,.3))
?? ??? ?);
?? ?}
?? ?/*active 當前展現狀態*/
?? ?.slider .ctrl a.ctrl-i_active,.slider .ctrl a.ctrl-i_active:hover{background-color: #000;}
?? ?.slider .ctrl a.ctrl-i_active:hover img{opacity: 0;}
??? ?/*幻燈片切換的樣式*/
?? ?.slider .main .main-i{opacity: 0;position: absolute;right: 50%;top:0;transition:all .5s;}
?? ?.slider .main .main-i h2{margin-right: 60px;}
?? ?.slider .main .main-i h3{margin-right: -60px;}
?? ?.slider .main .main-i h2,.slider .main .main-i h3{transition:all .8s 1s;}
?? ?.slider .main .main-i_active{opacity: 1;right: 0;}
?? ?.slider .main .main-i_active h2,.slider .main .main-i_active h3{margin-right: 0;}
?? ?
?? ?</style>
</head>
<body>
?? ?<div class="slider">
?? ??? ?
?? ??? ?<div class="main" id="template_main">
?? ??? ??? ?<div class="main-i" id="main_{{index}}">
?? ??? ??? ??? ?<img src="images/{{index}}.jpg" />
?? ??? ??? ??? ?<div class="caption">
?? ??? ??? ??? ??? ?<h2>{{h2}}</h2>
?? ??? ??? ??? ??? ?<h3>{{h3}}</h3>
?? ??? ??? ??? ?</div>
?? ??? ??? ?</div>
?? ??? ?</div>
?? ??? ?<div class="ctrl" id="template_ctrl">
?? ??? ??? ?<a href="javascript:switchSlider({{index}});" id="ctrl_{{index}}" class="ctrl-i"><img src="images/{{index}}.jpg" /></a>
?? ??? ?</div>
?? ?</div>

?? ?<script type="text/javascript">
?? ?// 定義腳本，獲取信息
?? ?// 1、數據定義（實際生產環境中，應由后臺給出）
?? ?var data=[
?? ??? ?{img:1,h1:'Monday',h2:'The First'},
?? ??? ?{img:2,h1:'Tuesday',h2:'The Second'},
?? ??? ?{img:3,h1:'Wednesday',h2:'The Third'},
?? ??? ?{img:4,h1:'Thursday',h2:'The Fourth'}
?? ?];
?? ?// 2、通用函數
?? ?var g = function (id) {
?? ??? ?if ( id.substr(0,1) == '.' ) {
?? ??? ??? ?return document.getElementsByClassName(id.substr(1));
?? ??? ?};
?? ??? ?return document.getElementById(id);
?? ?};
?? ?//3.添加幻燈片的操作(所有幻燈片&對應的按鈕)
?? ?function addSliders(){
?? ??? ?//3.1 獲取模版
?? ??? ?var tpl_main = g('template_main').innerHTML.replace(/^\s*/,'').replace(/\s*$/,'');
?? ??? ?var tpl_ctrl = g('template_ctrl').innerHTML.replace(/^\s*/,'').replace(/\s*$/,'');
?? ??? ?//3.2 定義最終輸出 HTML 的變量
?? ??? ?var out_main = [];
?? ??? ?var out_ctrl = [];
?? ??? ?//3.3 遍歷所有數據，構建最終輸出的HTML
?? ??? ?for ( i in data) {
?? ??? ??? ?var _html_main = tpl_main
?? ??? ??? ??? ??? ??? ??? ?.replace(/{{index}}/g,data[i].img)
?? ??? ??? ??? ??? ??? ??? ?.replace(/{{h2}}/g,data[i].h1)
?? ??? ??? ??? ??? ??? ??? ?.replace(/{{h3}}/g,data[i].h2);
?? ??? ??? ?var _html_ctrl = tpl_ctrl.replace(/{{index}}/g,data[i].img);?? ?
?? ??? ??? ?out_main.push(_html_main);
?? ??? ??? ?out_ctrl.push(_html_ctrl);?? ??? ??? ?
?? ??? ?};
?? ??? ?//3.4 把HTML 回寫到對應的DOM里面
?? ??? ?g('template_main').innerHTML = out_main.join('');
?? ??? ?g('template_ctrl').innerHTML = out_ctrl.join('');
?? ?};

?? ?//4.幻燈片切換
?? ?function switchSlider(n){
?? ??? ?//5.1 獲得要展現的幻燈片&控制按鈕 DOM
?? ??? ?var main = g('main_' + n);
?? ??? ?var ctrl = g('ctrl_' + n);

?? ??? ?//5.2 獲得所有的幻燈片以及控制按鈕
?? ??? ?var clear_main = g('.main-i');
?? ??? ?var clear_ctrl = g('.ctrl-i');

?? ??? ?//5.3 清除他們的active樣式
?? ??? ?for (i = 0; i < clear_ctrl.length; i++) {
?? ??? ??? ?clear_main[i].className = clear_main[i].className.replace('main-i_active','');
?? ??? ??? ?clear_ctrl[i].className = clear_ctrl[i].className.replace('ctrl-i_active','');
?? ??? ?};

?? ??? ?//5.4 為當前控制按鈕和幻燈片附加樣式
?? ??? ?main.className += 'main-i_active';
?? ??? ?ctrl.className += 'ctrl-i_active';
?? ?};

?? ?//5.定義何時處理幻燈片輸出
?? ?window.onload = function(){
?? ??? ?addSliders();
?? ??? ?switchSlider(1);
?? ?};
?? ?</script>
</body>
</html>