将字符串转为方法调用并传递参数

Question

function test(e) { alert(e.id); }
        var f = "test";
        function test2() {
            var t = {
                "id": 184,
                "title": "信访条例",
                "pubdate": "2014-09-02",
                "description": "新出通知，要求涉诉信访工作",
                "weight": 12
            };
window[f](t)
        }

Answer 1

function test(e) { alert(e.id); }
        var f = "test";
        function test2() {
            var t = {
                "id": 184,
                "title": "信访条例",
                "pubdate": "2014-09-02",
                "description": "新出通知，要求涉诉信访工作",
                "weight": 12
            };
            var ff = eval(f);
            new ff(t);
        }
哪一种效率高一点