flex中 for in 与 for each in 的区别。

 

package 
{ 
	import flash.display.Sprite;
	
	public class firstActionScript extends Sprite 
	{ 
		//flex工作原理  浏览器嵌入的flash player 运行flex生产的html  html运行生产的swf
		// * 任意的数据类型
		public function firstActionScript()
		{
			var array:Array = ["a","b","c","d"];
			for(var str:String in array) {
				trace("str"+str); //拿到的是索引  0 1 2 3
				trace(array[str]);//拿到的值 a b c d
			}
			for each(var str1:String in array) {
				trace("str"+str1);//直接拿值 a b c d
				
			}
			trace("------------------------------");
			var obj:Object = {id:3,name:"zhangsan",age:18};
			trace(obj.id);
			trace("--------------");
			for (var st:String in obj) {
				trace(st);//拿到属性 id name age
			}
			for each(var st1:String in obj) {
				trace(st1);//拿到属性对应的值 3  zhangsan  18
			}
			
			trace("--------------");
			trace(obj.name); //结果zhangsan
			trace(obj["name"]);//结果zhangsan
		} 
	} 
}