var jsondata = {"staff":[{"name":"红旗","age":"20"},{"name":"郭靖","age":"100"}]};

alert(jsondata.staff[0].name)

undefined

var jsondata = {"staff":[{"name":"红旗","age":"20"},{"name":"郭靖","age":"100"}]};

var jsonobj = parse('(' + jsondata +')');

alert(jsonobj.staff[0].name);

VM649:3 Uncaught ReferenceError: parse is not defined

    at <anonymous>:3:1

    at Object.InjectedScript._evaluateOn (<anonymous>:895:140)

    at Object.InjectedScript._evaluateAndWrap (<anonymous>:828:34)

    at Object.InjectedScript.evaluate (<anonymous>:694:21)

为什么没有第二句是对的，有了第二句就错了