js遍历json对象

一：原生js遍历json对象

　　<1>.无规律：

var json = [
　　{dd:'SB',AA:'东东',re1:123},
　　{cccc:'dd',lk:'1qw'}
];
for(var i=0,i<json.length;i++){
　　for(var key in json[i]){
　　　　alert(key+':'+json[i][key]);
　　}
}

　　 <2>.有规律：

var packJson = [
    {"name":"nikita", "password":"1111"},
    {"name":"tony", "password":"2222"}
];
for(var p in packJson){    //遍历json数组时，这么写p为索引，0,1
    alert(packJson[p].name + " " + packJson[p].password);
}
//也可以这样：
for(var i = 0; i < packJson.length; i++){
    alert(packJson[i].name + " " + packJson[i].password);
}

 　　<3>.遍历json对象

myJson = {"name":"caibaojian", "password":"1111"};
for(var p in myJson){    //遍历json对象的每个key/value对,p为key
  alert(p + " " + myJson[p]);
}
例：
var obj ={"name":"冯娟","password":"123456","department":"技术部","sex":"女","old":30};
for(var p in obj){
    str = str+obj[p]+',';
    return str;
}