摘要：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body onload="checkCook()"> <h1 id="h1" onclick="this.innerHTML='Hello'"> 阅读全文
摘要：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style> #container{ width: 400px; height: 400px; position: relative; background: 阅读全文