var dataSource:Object = {};
dataSource[1] = 1000;
dataSource[2] = 2000;
dataSource[3] = 3000;
dataSource[4] = 4000;
console.log("for each遍历");
for each(var value:int in dataSource){
console.log("for each"+"-"+value);
}
console.log("for in遍历");
for (var key:int in dataSource){
console.log("for in"+"-"+key);
}
根据代跑跑出来的结果可以发现，for each遍历的是dataSource中的每一项value
for in 遍历的是dataSource中每一项的key值
