var读写和function读写,get/set读写效率比较

 

var 比 function快4倍左右,

get/set和function差不多

 

95

var 读： 567

var 写： 563

[SWF] D:\flexProject\testSpeed\bin-debug\testSpeed.swf - 2,091 bytes after decompression

function 读： 1860

function 写： 2117

get/set 读： 1927

get/set 写： 2119

//测试代码

package {

 import flash.display.Sprite;

 import flash.utils.getTimer;

 public class testSpeed extends Sprite

 {

  public function testSpeed()

  {

   var aone:speedTest=new speedTest()  ;

   var max:int=5000000;//50000000

   var old:int=getTimer();

   for (var i:int = 0; i < max; i+=1) {

   

   }

   

   //var forTime:int=getTimer()-old;

   old=getTimer();

   

   //trace(forTime);

   trace(old);

   

   //

   var t:int=0;

   for (i = 0; i < max; i+=1) {

    t=aone.testVar;

   }

   trace("var 读：",getTimer() - old);// - forTime);

   

   old=getTimer();

   for (i = 0; i < max; i+=1) {

    aone.testVar=t;

   }

   trace("var 写：",getTimer() - old);// - forTime);

   //

   old=getTimer();

   //

   for (i = 0; i < max; i+=1) {

    t=aone.testFunctionGet();

   }

   trace("function 读：",getTimer() - old);// - forTime);

   old=getTimer();

   for (i = 0; i < max; i+=1) {

    aone.testFunctionSet(t);

   }

   trace("function 写：",getTimer() - old);// - forTime);

   

   //

   old=getTimer();

   //

   for (i = 0; i < max; i+=1) {

    t=aone.testGet;

   }

   trace("get/set 读：",getTimer() - old);// - forTime);

   old=getTimer();

   for (i = 0; i < max; i+=1) {

    aone.testSet=t;

   }

   trace("get/set 写：",getTimer() - old);// - forTime);

  }

 }

}

 

//

package{

 public class speedTest{

  public function speedTest(){}  

  public var testVar:int = 0;

  private var _function:int = 0;

  private var _getset:int = 0;

  public function testFunctionGet():int{

   return this._function;

  }

  public function testFunctionSet(i:int):void{

   this._function = i;

  }

  public function set testSet(i:int):void{

   this._getset = i;

  }

  public function get testGet():int{

   return this._getset;

  }

  

 }

}