递归的问题。

[qq290032431]

想给json数据的key值加引号，写的代码如下，

    var jsonT = {
        testUn7: {
            data: "test",
            data1:"test2s"
        }
    };
    function test(obj) {
        var str = "";
        var strKeyValue="";
        for (var i in obj) {
            strKeyValue = typeof (obj[i]) == "object" ?"{"+ test(obj[i]) +"}": "'" + obj[i] + "'";
            str += "'" + i + "'" + ":" + strKeyValue + ",";
        }
        str = str.length > 0 ? str.substr(0, str.length - 1) : "";
        console.log(str);
    }

预想的结果为：'testUn7':{'data':'test','data1':'test''test2s' } ，实际结果为:
'testUn7':{undefined} ,麻烦帮忙看看，问题出在哪里了，怎么改动下才能有如期效果，谢谢了。

[qq290032431]

刚刚我把递归的抽出来了，但是代码重复了，纠结。

function test2(obj) {
        var str = "";
        for (var i in obj) {
            strKeyValue = typeof (obj[i]) == "object" ? "{" + test2(obj[i]) + "}" : "'" + obj[i] + "'";
            str += "'" + i + "'" + ":" + strKeyValue + ",";
        }
        str = str.length > 0 ? str.substr(0, str.length - 1) : "";
        return str;
    }
    function test(obj) {
        var str = "";
        var strKeyValue="";
        for (var i in obj) {
            strKeyValue = typeof (obj[i]) == "object" ? "{" + test2(obj[i]) + "}" : "'" + obj[i] + "'";
            str += "'" + i + "'" + ":" + strKeyValue + ",";
        }
        str = str.length > 0 ? str.substr(0, str.length - 1) : "";
        console.log(str);
    }

效果倒是如期的效果。有啥改进办法没