hasClass addClass removeClass

//函数有class
function hasClass(ele,cls){
return -1<(" "+ele.className+" ").indexOf(" "+cls+" ")
}
//添加class
function addClass(ele,cls){
if((" "+ele.className+" ").indexOf(" "+cls+" ")==-1){
ele.className+=" "+cls;
}
else{
return
}}
//删除class
function removeClass(ele,cls){
if((" "+ele.className+" ").indexOf(" "+cls+" ")>-1){
var reg = new RegExp(‘(\\s|^)‘+cls+‘(\\s|$)‘);
ele.className=ele.className.replace(reg,‘ ‘) //注意替换为空格
}
}

hasClass addClass removeClass

原文：http://www.cnblogs.com/heyinwangchuan/p/5811939.html