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;
}
}
}
