AS3官方文档
1.hitTestOjbect()的用法http://help.adobe.com/zh_CN/AS3LCR/Flash_10.0/flash/display/DisplayObject.html#hitTestObject()
2.hitTestPoint()用法
http://help.adobe.com/zh_CN/AS3LCR/Flash_10.0/flash/display/DisplayObject.html#hitTestPoint()
后面的括号也要复制进去哦,,不然页面打不开