标签:blank class htm targe dom cheng www. w3c w3c标准
http://www.cnblogs.com/chengxs/p/6388779.html
http://www.jb51.net/article/42492.htm
w3c标准 dom对象 事件冒泡和事件捕获
原文地址:https://www.cnblogs.com/mttcug/p/8717526.html