如何将javascript文本转换成json数组?[复制品]

可能重复:
How to count JavaScript array objects?

如果不是javascript数组,那么如何将其转换为json数组呢?

var member = {
    "mother": {
        "name" : "Mary",
        "age" : "48"
    },
    "father": {
        "name" : "Bill",
        "age" : "50",
        "friend": {
          "co-worker" : "Jake"
        }
    },
    "brother": {
        "name" : "Alex",
        "age" : "28"
    }
}