摘要：
##编写代码 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>pr 阅读全文
摘要：
1.html老标签 <meta charset=”UTF-8”>//设置网页字体编码 <meta http-equiv="refresh" content="300">//300后页面刷新 <meta http-equiv="refresh" content="0;URL=链接">//0秒后页面跳转 阅读全文
摘要：
##编写代码 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Do 阅读全文