function checkInputLen(field,maxLen,errorString){
       for(var i=0;i<field.length;i++){
	document.getElementsByName(field[i])[0].value=trim(document.getElementsByName(field[i])[0].value);
	     if(getTrueLength(document.getElementsByName(field[i])[0].value)>maxLen[i]){
		      alert(errorString[i]+"长度不能超过"+maxLen[i]+"字符");
			  return false;
		 }
	   }
	   return true;
   }