javascript中提取元素

Question

{"topic1":{"609":["A","B"],"610":["C","D","E"]}}在js中如何把609,610,A,B,C,D,E分别提取出来？

Answer 1

var obj = {"topic1":{"609":["A","B"],"610":["C","D","E"]}};

for(var p in obj.topic1) {

    console.log(p);  //获取到609、610

    var t = obj.topic1[p];

    for(var i = 0; i < t.length; i++){

        console.log(t[i]);  //获取A、B、C、D、E

    }

}