//判断字符串是否有重复

function IsRepeat(lessonName){

var repeatName="";

var hash = {};

var arrStr=lessonName.split(',');

for(var i=0;i<arrStr.length;i++){

if(!hash[arrStr[i]])

{

//不重复

hash[arrStr[i]]=true;

}

else{

//重复

repeatName+=arrStr[i]+"、";

}

}

if(repeatName!=""){

alert("XX："+repeatName.substring(0,repeatName.length-1)+"存在重复！");

}

}