json格式 Js里循环遍历json格式数据

什么是JOSN

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var list = {'list':[{"id":8,"password":"月月","username":"维吾尔"},
{"id":7,"password":"dfgsfdf","username":"dfdfdf"},
{"id":6,"password":"aaabbb","username":"aaaabbb"},
{"id":5,"password":"gfdfgdf","username":"fggegte"},
{"id":3,"password":"dfgfgrewr","username":"hahaha"},
{"id":2,"password":"fggfhgfh","username":"fddgfgh"},
{"id":1,"password":"hdghdgd","username":"dfsgss"}]};

for(var l in list){
alert(l+"  "+list[l]);
for(var c in list[l]){
alert(list[l][c].id+"  "+list[l][c].password+"  "+list[l][c].username);
}
}

for(var l in list){
alert(l+"  "+list[l]);
for(var c in list[l]){
for(var _c in list[l][c]){
alert(_c+"  "+list[l][c][_c]);
};
}
}

var li = [{"id":8,"password":"月月","username":"维吾尔"},
{"id":7,"password":"dfgsfdf","username":"dfdfdf"},
{"id":6,"password":"aaabbb","username":"aaaabbb"},
{"id":5,"password":"gfdfgdf","username":"fggegte"},
{"id":3,"password":"dfgfgrewr","username":"hahaha"},
{"id":2,"password":"fggfhgfh","username":"fddgfgh"},
{"id":1,"password":"hdghdgd","username":"dfsgss"}];

for(var i in li){
alert(i+"  "+li[i]);
for(var _i in li[i]){
alert(_i+"  "+li[i][_i]);
}
}

var obj = [ {"date":"2010-12-19", "price":123},
{"date":"2010-12-12", "price":33},
{"date":"2010-12-21", "price":444}
];

for(var i=0;i<obj.length;i++){
if(obj[i].date == '2010-12-12'){
return obj[i].price
}
}