js将json字符串转化为json对象

//JjStatusList  = [{"itemKey":"0","itemKeyName":"张三"},{{"itemKey":"1","itemKeyName":"李四"}}]
 var JjStatusList = "<%=JjStatus%>";
        $(function(){
                var ss = JSON.parse(JjStatusList);
                alert(ss[0].itemKey);
                init();
            }
        );

        var json = '<%=request.getAttribute("JOSNtsr")%>';
        var obj = JSON.parse(json);