js里,json,求value所对应key的值.

[12ers_梦骑士]

重复一遍,是求value所对应key的值.
知道value.求key!!!
举例,最简单的,二维一一对应的.
var findkey={"firstName":"Brett","lastName":"McLaughlin","email":"aaaa"};

[allali]

function find(value){
				var findkey={"firstName":"Brett","lastName":"McLaughlin","email":"aaaa"};
				for(var key in findkey){
					if(findkey[key] == value)
						return key;
				}
				return null;
		}
		alert(find("aaaa"));

[suano]

循环遍历然后判断了