摘要：
html页 <!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Demo</title> <style> body, input, selec 阅读全文
摘要：
html文件中demo2_index.html <! DOCTYPE> <html> <head> <meta charset= "utf-8" > <title>Demo2 </title> <style> body, input, button, select, h1 { font-size: 阅读全文