摘要:
W3规范: querySelector: return the first matching Element node within the node's subtress. if there is no such node, the method must return null. 返回指定元素节 阅读全文
摘要:
<h2 id = "show"></h2> <script type = "text/javascript"> var show = document.getElementById('show'); function start() { //给定时间 var Gdate = new Date('20 阅读全文