事件绑定的方法:
function addEventListener(element,type,fn){
if(element.addEventListener){
element.addEventListener(type,fn,false);
}else if (element.attchEvent){
element.attchEvent(“on”+type,fn);
}else {
element[“on”+type]=fn;
}
}
事件解绑的方法:
function removeEventListener(element,type,fn){
if(element.removeEventListener){
element.removeEventListener(type,fn,false);
}else if (element.detchEvent){
element.detchEvent(“on”+type,fn);
}else {
element[“on”+type]=null;
}
}