js 检测是否有选择多选框的至少一项

  //检测是否有选择多选框的至少一项
	 function chkCheckBoxChs(){ 
		var obj = document.getElementsByName("chkIds");
		var objLen= obj.length; 
		var str="";
		var objYN=false; 
		for (var i = 0;i< objLen;i++){
			if (obj [i].checked==true) {
			    objYN= true;
			    break;
			}
		}
		return objYN;
	}