js 实现获取对象所有键名（key）的方法

 1     var jsonObject1 = {
 2             "name": "xiaoming",
 3             "age": 29
 4         },
 5         var keys1 = [];
 6     for (var p1 in jsonObject1) {
 7         if (jsonObject1.hasOwnProperty(p1))
 8             keys1.push(p1);
 9     }
10     alert(keys1);

1     Object.prototype.test = "I am test";
2     var jsonObject = {
3             "name": "xiaoming",
4             "age": 29
5         },
6         keys = [];
7     for (var p in jsonObject)
8         keys.push(p);
9     alert(keys);  //name,age, test