Uncaught TypeError: Cannot read property 'className' of undefined(主图显示不出来)
在clear_main[i].className = clear_main[i].className
.replace('main-i_active', ' ');
这一行提示除了错误，然后整个主图是空白的。
自己检查了好几遍仍不知道是哪里出了问题，还请有经验的大神能帮我看一下，十分感谢！
<body>
<div class="slider">
<!--0.修改 view->Template（关键字替换），增加template id-->
<div class="main">
<div class="main-i" id="template_main">
<div class="caption" id="main_{{index}}">
<h2>{{h2}}</h2>
<h3>{[h3}}</h3>
</div>
<img src="images/{{index}}.jpg"/>
</div>
</div>
<div class="ctrl" id="template_ctrl">
<a class="ctrl-i" id="ctrl_{{index}}" href="javascript:switchSlider({{index}});"><img src="images/{{index}}.jpg"/></a>
</div>
<script type="text/javascript">
//1.数据定义（实际环境中应由后台给出）
var data = [
{img:1,h1:'Creative',h2:'DUET'},
{img:2,h1:'Friendly',h2:'DEVIL'},
{img:3,h1:'Tranquilent',h2:'COMPATRIOT'},
{img:4,h1:'Insecure',h2:'HUSSLER'},
{img:5,h1:'Loving',h2:'REBEL'},
{img:6,h1:'Passionate',h2:'REBEL'},
{img:7,h1:'Crazy',h2:'FRIEND'}
];
//2.通用函数
var g = function(id) {
if (id.substr(0, 1) == '.') {
return document.getElementsByClassName(id.substr(1));
}
return document.getElementById(id);
};
//3.添加幻灯片
function addSliders() {
//3.1获取模版
var tpl_main = g('template_main').innerHTML
.replace(/^\s*/, '')
.replace(/\s*$/, '');
var tpl_ctrl = g('template_ctrl').innerHTML
.replace(/^\s*/, '')
.replace(/\s*$/, '');
//3.2定义最终输出html的变量
var out_main = [];
var out_ctrl = [];
//3.3遍历所有数据，构建最终输出的html
for( var i=0; i<data.length;i++ ) {
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回写到对应的dom里
g('template_main').innerHTML = out_main.join(' ');
g('template_ctrl').innerHTML = out_ctrl.join(' ');
}
//5.幻灯片切换
function switchSlider(n){
//5.1获得要展现的幻灯片和控制按钮dom
var main = g('main_'+n);
var ctrl = g('ctrl_'+n);
//5.2获得所有幻灯片以及控制按钮
var clear_main = g('.main-i');
var clear_ctrl = g('.ctrl-i');
//5.3清楚他们的active样式
for(var 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为当前控制按钮和幻灯片附加样式
main.className += 'main-i_active';
ctrl.className += 'ctrl-i_active';
}
//4.何时处理幻灯片输出
window.onload = function () {
addSliders();
switchSlider(1);
}
</script>
</div>
