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

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);
}

for(var i = 0; i < packJson.length; i++){
 alert(packJson[i].name + " " + packJson[i].password);
}

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]);
}

for(var p in obj){
str = str+obj[p]+',';
return str;
}