什么是动作脚本中更快的普通对象或强类型对象? [英] What is faster plain objects or strongly typed objects in actionscript?

问题描述

也是

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

比如果我有像 User 这样的值对象要慢?

slower than if I have a value object like User?

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

推荐答案

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) 大约比 UntypedObject ({}) 快 3-3.5 倍，但在日复一日.试用 Grant Skinner 的性能测试工具 以运行更好/更高级测试:).

Simple speed test shows that TypedObject (User) is roughly 3-3.5x faster than UntypedObject ({}), but it's nothing you'd ever notice in the day-to-day. Try out Grant Skinner's Performance Test Harness to run some better/advanced tests :).

3 次简单的试运行:

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:Typed 比 Untyped 快.

Verdict: Typed is faster than Untyped.

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