firefox浏览器不能使用window.close的解决方案

 function closeWindow() {
           var browserName = navigator.appName;
           if (browserName == "Netscape") {
               window.open(‘‘, ‘_self‘, ‘‘);
               window.close();
           }
           else {
               if (browserName == "Microsoft Internet Explorer") {
                   window.open(‘‘, ‘_parent‘, ‘‘);
                   window.close();
               }
           }
       }