checkbox排它取舍

//checkbox选择第一项则不能选择其它项
function checkSymptomPossible(){
			var symptomPossible=document.getElementsByName("managementSyndromesymptomPossible_chk");
			if(symptomPossible[0].checked){
				for(var i=1;i<symptomPossible.length;i++){
					symptomPossible[i].checked=false;
				}
			}
		}