摘要：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <h1 class="time"></h1> <button class="stop">暂停时间</button> <script 阅读全文
摘要：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> h1{ text-align: center; } </style> </head> <body> <div id 阅读全文