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delete与前版本的有很大区别

代码：

var var1:Boolean=true
trace("var1="+var1)//true
delete var1
trace("var1="+var1)true

delete在as2无所不能，到了as3，连个简单变量也不能删除，其实，delete只能删除动态创建的变量

var arr:Array=[0,1]
trace("arr="+arr,"length="+arr.length)//arr=0,1 length=2
delete arr
trace("arr="+arr,"length="+arr.length)//arr=0,1 length=2
delete arr[0]
trace("arr="+arr,"length="+arr.length)//arr=,1 length=2

也就是说，动态类（Object，Array，MovieClip等）的实例动态添加的变量可以用delete删除