Array和Object 两种实例化方法效率的比较

Array和Object

其实

var list:Array = new Array;

var arg:Object = new Object;

比

var list:Array = [];

var arg:Object = {};

慢

证明：

new Object和{}进行比较

var length:int = 1000000;

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

  var list:Object = new Object;

}

trace(getTimer());

// trace: 754

var length:int = 1000000;

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

  var list:Object = {};

}

trace(getTimer());

// trace: 547

new Array和[]进行比较

var length:int = 1000000;

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

  var list:Array = new Array;

}

trace(getTimer());

// trace: 1803

var length:int = 1000000;

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

  var list:Array = [];

}

trace(getTimer());

// trace: 604

从这个例子还可以看出实例化Object比Array快