摘要:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> #main{ height: 400px; width: 400px; margin: 20px auto; } 阅读全文
摘要:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> #box{ background-color: green; border-radius: 20px; paddi 阅读全文
摘要:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <input type="text" placeholder="请输入一个数字" /> <input type="text" pla 阅读全文