javascript中获取class

//封装getClass
function getClass(tagName,className) //获得标签名为tagName,类名className的元素
{
if(document.getElementsByClassName) //支持这个函数
{        return document.getElementsByClassName(className);
}
else
{       var tags=document.getElementsByTagName(tagName);//获取标签
var tagArr=[];//用于返回类名为className的元素
for(var i=0;i < tags.length; i++)
{
if(tags[i].class == className)
{
tagArr[tagArr.length] = tags[i];//保存满足条件的元素
}
}
return tagArr;
}
}

<ul>
<li class="dicTap">1</li>
<li class="dicTap">2</li>
<li class="dicTap">3</li>
<li class="dicTap">4</li>
</ul>

window.onload = function()
{   var topMenus = getClass('li','dicTap');
for(var i=0;i < topMenus.length; i++)
{
alert(topMenus[i].innerHTML);
}

}

//点击的	自定义属性personid，打开详情页面并且进行跨页面传值
var dicTap = getClass('li','dicTap');
for(var i=0;i <dicTap.length; i++)
{
dicTap[i].addEventListener('tap',function(){
var personId=this.getAttribute("personid");
localStorage.a=personId;
mui.openWindow({
url: 'disciplineDetail.html',
id:'disciplineDetail'
});
})
}

//封装getClass
function getClass(tagName,className) //获得标签名为tagName,类名className的元素
{
if(document.getElementsByClassName) //支持这个函数
{        return document.getElementsByClassName(className);
}
else
{       var tags=document.getElementsByTagName(tagName);//获取标签
var tagArr=[];//用于返回类名为className的元素
for(var i=0;i < tags.length; i++)
{
if(tags[i].class == className)
{
tagArr[tagArr.length] = tags[i];//保存满足条件的元素
}
}
return tagArr;
}
}