请问哪里出错了?

Question

想分别打印出 bill, steve, bann 的各项

var friends={

    bill:{firstName:'Bill',lastName:'Manson',number:'123',address:['Hanson225, Sanhen St.','LA','903987']},

    steve:{firstName:'Steve',lastName:'Nanon',number:'456',address:['JackMarry59, Nahop St.','CA','809756']},

    bann:{firstName:'Bann',lastName:'Mason',number:'789',address:['Homon25, Hogon St.','OH','309878']}

    };

var list=function(friends){

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

        for(var j=0;j<friends[i].length;j++){

        console.log(friends[i][j];);

        };

        };

    };

//报错:SyntaxError: missing ) after argument list

Answer 1

为什么要用for循环而不去用for……in呢？对象可以通过对象[0]对象[1]的形式获取到对应的属性值吗？这个求问，好像我是没有这么拿过。只有在for…in里这么用过。?