摘要：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>文档标题</title> <script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></scrip 阅读全文
摘要：
<!DOCTYPE html><html> <head> <meta http-equiv="Content-type" content="text/html; charset=utf-8" /> <title></title> <style> .left div, .right div { wid 阅读全文