只出现一次的提示信息(js+cookies) 时间:2020-05-13 人气:0 <html> <head> <title>只出现一次的提示信息</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> </head> <body> <script> var alertmessage="Welcome to \n 这个提示信息只会出现一次哟！刷新一下页面试试？肯定没有提示了~" var once_per_session=1 function get_cookie(Name) { var search = Name + "=" var returnvalue = ""; if (document.cookie.length > 0) { offset = document.cookie.indexOf(search) if (offset != -1) { // if cookie exists offset += search.length end = document.cookie.indexOf(";", offset); if (end == -1) end = document.cookie.length; returnvalue=unescape(document.cookie.substring(offset, end)) } } return returnvalue; } function alertornot(){ if (get_cookie('alerted')==''){ loadalert() document.cookie="alerted=yes" } } function loadalert(){ alert(alertmessage) } if (once_per_session==0) loadalert() else alertornot() </script> </body> </html> [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行] 加载全部内容