摘要：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> #d01{ width: 100px; height: 100px; background-color: red; position: absolute; } </style> </head> <body> <di 阅读全文
摘要：
开始/暂停 阅读全文
摘要：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <h1 id="count"></h1> </body> <script type="text/javascript"> var count=document.getElementById("count"); 阅读全文