Tools to consider browser compatibility time demo

        Support for cross-browser add events.        var btn = document.getElementById ("btn");        function Showmes () {alert ("Hello world!");                } var eventutil = {Addhander:function (element,type,hander) {//To determine whether it is a DOM2 level operation except IE                if (Element.addeventlistener) {Element.addeventlistener (type,hander,false);                } else if (element.attachevent) {element.attachevent ("on" +type,hander);                }else{element["on" +type] = hander;                }}, Removehander:function (Element,type,hander) {//To determine whether it is a DOM2 level operation except IE                if (Element.removeeventlistener) {Element.removeeventlistener (type,hander,false);                } else if (element.detachevent) {element.detachevent ("on" +type,hander);                }else{element["on" +type] = null; }}, GETevent:function (event) {return event?event:window.event;            }, Gettype:function (event) {return event.type; }, Getelement:function (event) {return event.target| |            Event.srcelement; }, Preventdefault:function (event) {if (Event.preventdefault) {event.prevent                Default ();                } else{Event.returnvalue=false;                    }}, Stoppropagation:function (event) {if (event.stoppropagation) {                Event.stoppropagation ();                } else{event.canclebubble = true; }            }        }

Tools to consider browser compatibility time demo