事件绑定

Array.prototype.indexOf = function( obj ){ var result = -1 , length = this.length , i=length - 1; for ( ; i>=0 ; i-- ) { if ( this[i] == obj ) { result = i; break; } } return result; } Array.prototype.contains = function( obj ) { return ( this.indexOf( obj ) >=0 ) } Array.prototype.append = function( obj , nodup ) { if ( !(nodup && this.contains( obj )) ) { this[this.length] = obj; } } Array.prototype.remove = function( obj ) { var index = this.indexOf( obj ); if ( !index ) return ; return this.splice( index , 1); }; function addEvent(element , type , fun){ if (!element.events) element.events = {}; var handlers = element.events[type]; if (!handlers) { handlers = element.events[type] = []; if(element['on' + type]) { handlers[0] = element['on' + type]; } } handlers.append( fun , true) element['on' + type] = handleEvent; } function removeEvent(element , type , fun) { if (element.events && element.events[type]) { element.events[type].remove(fun); } } function handleEvent(event) { var returnValue = true , i=0; event = event || fixEvent(window.event); var handlers = this.events[event.type] , length = handlers.length; for ( ; i < length ; i++) { if ( handlers[i].call( this , event) === false ){ returnValue = false; } } return returnValue; } function fixEvent(event) { event.preventDefault = fixEvent.preventDefault; event.stopPropagation = fixEvent.stopPropagation; return event; } fixEvent.preventDefault = function() { this.returnValue = false; }; fixEvent.stopPropagation = function() { this.cancelBubble = true; };