司徒正美的一些关于javascript的处理的兼容写法。如果不想用这些，可以直接用jQuery中的功能。如bind,unbind,$('XX')，$(document).ready()等

绑定事件

var addEvent = function( obj, type, fn ) {
if (obj.addEventListener)
obj.addEventListener( type, fn, false );
else if (obj.attachEvent) {
obj["e"+type+fn] = fn;
obj.attachEvent( "on"+type, function() {
obj["e"+type+fn]();
} );
}
};

另一个实现

var addEvent = (function () {
if (document.addEventListener) {
return function (el, type, fn) {
el.addEventListener(type, fn, false);
};
} else {
return function (el, type, fn) {
el.attachEvent('on' + type, function () {
return fn.call(el, window.event);
});
}
}
})();

移除事件

var removeEvent = function(obj, type, fn) {
if (obj.removeEventListener)
obj.removeEventListener( type, fn, false );
else if (obj.detachEvent) {
obj.detachEvent( "on"+type, obj["e"+type+fn] );
obj["e"+type+fn] = null;
}
}

加载事件与脚本

var loadEvent = function(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
}else {
window.onload = function() {
oldonload();
func();
}
}
}

阻止事件

var cancelEvent = function(event) {
event = event||window.event
if (event.preventDefault) {
event.preventDefault( );
event.stopPropagation( );
} else {
event.returnValue = false;
event.cancelBubble = true;
}
}

取得事件源对象

相当于Prototype.js框架的Event.element(e)

var getTarget = function(event){
event = event || window.event;
var obj = event.srcElement ? event.srcElement : event.target;
return obj
}