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為什么幻燈片切換不起作用,且main_active的用處不明,是名稱還是激活后的樣子?

*{padding:0;?margin:0;}
body{
	padding:50px?0;
	background-color:#fff;
	font-size:14px;
	color:#555;}
	
.slider,.slider?.main{width:100%;
	height:400px;
	position:relative;}
	/*幻燈片區(qū)域*/
.slider?.main{
	overflow:hidden;
	}
	/*每個(gè)幻燈片的樣式*/
.slider?.main?.main-i{}
.slider?.main?.main-i?img{
	width:100%;
	position:absolute;
	left:0;
	top:0;}
.slider?.main?.main-i?.caption{
	position:?absolute;
	right:?50%;
	top:?-2px;
	z-index:?9;
	}
.slider?.main?.main-i?.caption?h2{?font-size:40px;
	line-height:50px;
	color:#b5b5b5;
	text-align:right;}
.slider?.main?.main-i?.caption?h3{font-size:70px;
	line-height:70px;
	color:#000000;
	text-align:right;}
	
	/*控制區(qū)域*/
.slider?.ctrl{
	width:100%;
	height:13px;
	text-align:center;
	position:absolute;
	left:0;
	bottom:-13px;
	margin-left:1px;
	}
.slider?.ctrl?.ctrl-i{
	display:inline-block;
	width:150px;
	height:13px;
	background:#666;
	box-shadow:0?1px?1px?rgba(0,0,0,.3);
	position:relative;}
.slider?.ctrl?.ctrl-i?img{
	width:150px;
	position:absolute;
	left:0;
	bottom:50px;
	z-index:1;
	opacity:0;
	-moz-transition:all?0.5s;
	}
/*hover控制按鈕樣式*/
.slider?.ctrl?.ctrl-i:hover{
	background:#f0f0f0;}
.slider?.ctrl?.ctrl-i:hover?img{
	bottom:13px;
	opacity:1;
	
	}

	/*active*/

.slider?.ctrl?.ctrl-i:active{
	background:#000;}
.slider?.ctrl?.ctrl-i:active?img{
	opacity:0;}
var?data?=[
	{img:1,h1:'Creative',h2:'DUCT'},
	{img:2,h1:'Friendly',h2:'DEVIL'},
	{img:3,h1:'DDDDAAA',h2:'AAAAAD'},
	{img:4,h1:'FWendy',h2:'DADIL'},
	{img:5,h1:'WDy',h2:'WVIL'},
	{img:6,h1:'Cendly',h2:'SDL'},
	{img:7,h1:'FrSndly',h2:'DVIL'},
	];
//2.通用函數(shù)//
var?g?=?function?(id)?{
	if(?id.substr(0,1)?==?'.'){
		return?document.getElementByClassName(id.substr(1));
		}
		return?document.getElementById(id);
	}
//3.添加幻燈片的操作
function?addSliders(){
	var?tpl_main?=?g('template_main').innerHTML
									.replace(/^\s*/,'')
									.replace(/\s*$/,'');
	var?tpl_ctrl?=?g('template_ctrl').innerHTML
									.replace(/^\s*/,'')
									.replace(/\s*$/,'');
	var?out_main?=?[];
	var?out_ctrl?=?[];
	
	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);
		}
		g('template_main').innerHTML?=?out_main.join('');
		g('template_ctrl').innerHTML?=?out_ctrl.join('');
	}
//5.幻燈片切換
function?switchSlider(n){
	var?main?=?g('main_'+n);
	var?ctrl?=?g('ctrl_'+n);
	var?clear_main?=?g('.main_i');
	var?clear_ctrl?=?g('.ctrl_i');
	for(i=0;i<clear_ctrl.length;i++){
		clear_ctrl[i].className?=?clear_ctrl[i].className
		.replace('?ctrl-i_active','');
		clear_main[i].className?=?clear_main[i].className
		.replace('?main-i_active','');}
	
	
	main.className?+='?main-i_active';
	ctrl.className?+='?ctrl-i_active';
}
//4.定義何時(shí)處理幻燈片輸出
window.onload?=?function(){
	addSliders();}
<!doctype?html>
<html>
<head>
<meta?charset="utf-8">
<title>無標(biāo)題文檔</title>
<link?href="css/20160221.css"?rel="stylesheet"?type="text/css">
<script?src="JS/20160223.js"></script>
</head>

<body>
<div?class="slider">
	<div?class="main"?id="template_main">
????	<div?class="main-i?main-i_active""?id="main_{{index}}">
????????	<div?class="caption">
????????????	<h2>{{h2}}</h2>
????????????????<h3>{{h3}}</h3>
????????????</div>
????????????<img?src="image/{{index}}.jpg">
????????</div>
????</div>
????<div?class="ctrl"?id="template_ctrl">
????	<a?class="ctrl-i"?id="ctrl_{{index}}"?href="javascript:switchSlider{{index}};"><img?src="image/{{index}}.jpg"></a>
???????
????</div>
</div>?
</body>
</html>


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為什么幻燈片切換不起作用,且main_active的用處不明,是名稱還是激活后的樣子?

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