ActionScript 中的普通对象和强类型对象哪个更快？

So is

public var user:Object = {}; 
user["firstName"] = "Bill";
user["lastName"] = "Cosby";

比我有像 User 这样的值对象慢吗？

var user:User = new User();
user.firstName = "Bill";
user.lastName = "Cosby";

public function speedTest():void               
{            
    var typedObjects:Array = [];
    var dynamicObjects:Array = [];
    var typedObject:User;
    var dynamicObject:Object;
    var i:int = 0;
    var n:int = 10000;
    for (i; i < n; i++)
    {
        dynamicObject = {};
        dynamicObjects.push(dynamicObject);
        typedObject = new User();
        typedObjects.push(typedObject);
    }
    // typed
    var time:int = getTimer();
    i = 0;
    n = 10000;
    for (i; i < n; i++)
    {
        typedObject = typedObjects[i];
        typedObject.firstName = "Bill";
        typedObject.lastName = "Cosby";
    }
    var end:int = getTimer() - time;
    trace("TypedObject Time: ", end/1000, "sec");

    // untyped
    time = getTimer();
    i = 0;
    n = 10000;
    for (i; i < n; i++)
    {
        dynamicObject = dynamicObjects[i];
        dynamicObject["firstName"] = "Bill";
        dynamicObject["lastName"] = "Cosby";
    }
    end = getTimer() - time;
    trace("DynamicObject Time: ", end/1000, "sec");
}   

简单的速度测试表明 TypedObject (User) 比 UntypedObject ({}），但这不是你在日常生活中注意到的。试用格兰特·斯金纳的性能测试工具运行一些更好/高级的测试:)。

3个简单的试运行：

TypedObject Time:  0.002 sec
DynamicObject Time:  0.007 sec
TypedObject Time:  0.002 sec
DynamicObject Time:  0.006 sec
TypedObject Time:  0.002 sec
DynamicObject Time:  0.006 sec

结论：类型化比非类型化更快。