Js script-determine the small pop-up window and user browser type
1. pop-up window for the user to choose whether to continue the next step
Html> body> script type = "text/JavaScript"> var r = confirm ("this system only supports the chrom browser! Incompatible with IE and firefox! Continue? "); If (r = false) {window. history. back (-1);} script> body> html>
2. Determine the browser type used by the user
html>body>script type="text/javascript"> var Sys = {}; var ua = navigator.userAgent.toLowerCase(); var s; (s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] : (s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] : (s = ua.match(/chrome\/([\d.]+)/)) ? Sys.chrome = s[1] : (s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] : (s = ua.match(/version\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0; if (Sys.ie) document.write('IE: ' + Sys.ie); if (Sys.firefox) document.write('Firefox: ' + Sys.firefox); if (Sys.chrome) document.write('Chrome: ' + Sys.chrome); if (Sys.opera) document.write('Opera: ' + Sys.opera); if (Sys.safari) document.write('Safari: ' + Sys.safari); script>body>html>