event.js

这是一个ajax的例子大家好好的看看就是一个鱼眼的效果

if(!dojo._hasResource["dojo._base.event"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojo._base.event"] = true;
dojo.provide("dojo._base.event");
dojo.require("dojo._base.connect");

// this file courtesy of the TurboAjax Group, licensed under a Dojo CLA

(function(){
	// DOM event listener machinery
	var del = (dojo._event_listener = {
		add: function(/*DOMNode*/node, /*String*/name, /*Function*/fp){
			if(!node){return;} 
			name = del._normalizeEventName(name);
			fp = del._fixCallback(name, fp);
			var oname = name;
			if(!dojo.isIE && (name == "mouseenter" || name == "mouseleave")){
				var ofp = fp;
				//oname = name;
				name = (name == "mouseenter") ? "mouseover" : "mouseout";
				fp = function(e){
					// thanks ben!
					if(!dojo.isDescendant(e.relatedTarget, node)){
						// e.type = oname; // FIXME: doesn't take? SJM: event.type is generally immutable.
						return ofp.call(this, e); 
					}
				}
			}
			node.addEventListener(name, fp, false);
			return fp; /*Handle*/
		},
		remove: function(/*DOMNode*/node, /*String*/event, /*Handle*/handle){
			// summary:
			//		clobbers the listener from the node
			// node:
			//		DOM node to attach the event to
			// event:
			//		the name of the handler to remove the function from
			// handle:
			//		the handle returned from add
			if (node){
				node.removeEventListener(del._normalizeEventName(event), handle, false);
			}
		},
		_normalizeEventName: function(/*String*/name){
			// Generally, name should be lower case, unless it is special
			// somehow (e.g. a Mozilla DOM event).
			// Remove 'on'.
			return name.slice(0,2) =="on" ? name.slice(2) : name;
		},
		_fixCallback: function(/*String*/name, fp){
			// By default, we only invoke _fixEvent for 'keypress'
			// If code is added to _fixEvent for other events, we have
			// to revisit this optimization.
			// This also applies to _fixEvent overrides for Safari and Opera
			// below.
			return name != "keypress" ? fp : function(e){ return fp.call(this, del._fixEvent(e, this)); };
		},
		_fixEvent: function(evt, sender){
			// _fixCallback only attaches us to keypress.
			// Switch on evt.type anyway because we might 
			// be called directly from dojo.fixEvent.
			switch(evt.type){
				case "keypress":
					del._setKeyChar(evt);
					break;
			}
			return evt;
		},
		_setKeyChar: function(evt){
			evt.keyChar = evt.charCode ? String.fromCharCode(evt.charCode) : '';
		}
	});

	// DOM events
	
	dojo.fixEvent = function(/*Event*/evt, /*DOMNode*/sender){
		// summary:
		//		normalizes properties on the event object including event
		//		bubbling methods, keystroke normalization, and x/y positions
		// evt: Event
		//		native event object
		// sender: DOMNode
		//		node to treat as "currentTarget"
		return del._fixEvent(evt, sender);
	}

	dojo.stopEvent = function(/*Event*/evt){
		// summary:
		//		prevents propagation and clobbers the default action of the
		//		passed event
		// evt: Event
		//		The event object. If omitted, window.event is used on IE.
		evt.preventDefault();
		evt.stopPropagation();
		// NOTE: below, this method is overridden for IE
	}

	// the default listener to use on dontFix nodes, overriden for IE
	var node_listener = dojo._listener;
	
	// Unify connect and event listeners
	dojo._connect = function(obj, event, context, method, dontFix){
		// FIXME: need a more strict test
		var isNode = obj && (obj.nodeType||obj.attachEvent||obj.addEventListener);
		// choose one of three listener options: raw (connect.js), DOM event on a Node, custom event on a Node
		// we need the third option to provide leak prevention on broken browsers (IE)
		var lid = !isNode ? 0 : (!dontFix ? 1 : 2), l = [dojo._listener, del, node_listener][lid];
		// create a listener
		var h = l.add(obj, event, dojo.hitch(context, method));
		// formerly, the disconnect package contained "l" directly, but if client code
		// leaks the disconnect package (by connecting it to a node), referencing "l" 
		// compounds the problem.
		// instead we return a listener id, which requires custom _disconnect below.
		// return disconnect package
		return [ obj, event, h, lid ];
	}

	dojo._disconnect = function(obj, event, handle, listener){
		([dojo._listener, del, node_listener][listener]).remove(obj, event, handle);
	}

	// Constants

	// Public: client code should test
	// keyCode against these named constants, as the
	// actual codes can vary by browser.
	dojo.keys = {
		// summary: definitions for common key values
		BACKSPACE: 8,
		TAB: 9,
		CLEAR: 12,
		ENTER: 13,
		SHIFT: 16,
		CTRL: 17,
		ALT: 18,
		PAUSE: 19,
		CAPS_LOCK: 20,
		ESCAPE: 27,
		SPACE: 32,
		PAGE_UP: 33,
		PAGE_DOWN: 34,
		END: 35,
		HOME: 36,
		LEFT_ARROW: 37,
		UP_ARROW: 38,
		RIGHT_ARROW: 39,
		DOWN_ARROW: 40,
		INSERT: 45,
		DELETE: 46,
		HELP: 47,
		LEFT_WINDOW: 91,
		RIGHT_WINDOW: 92,
		SELECT: 93,
		NUMPAD_0: 96,
		NUMPAD_1: 97,
		NUMPAD_2: 98,
		NUMPAD_3: 99,
		NUMPAD_4: 100,
		NUMPAD_5: 101,
		NUMPAD_6: 102,
		NUMPAD_7: 103,
		NUMPAD_8: 104,
		NUMPAD_9: 105,
		NUMPAD_MULTIPLY: 106,
		NUMPAD_PLUS: 107,
		NUMPAD_ENTER: 108,
		NUMPAD_MINUS: 109,
		NUMPAD_PERIOD: 110,
		NUMPAD_DIVIDE: 111,
		F1: 112,
		F2: 113,
		F3: 114,
		F4: 115,
		F5: 116,
		F6: 117,
		F7: 118,
		F8: 119,
		F9: 120,
		F10: 121,
		F11: 122,
		F12: 123,
		F13: 124,
		F14: 125,
		F15: 126,
		NUM_LOCK: 144,
		SCROLL_LOCK: 145
	};
	
	// IE event normalization
	if(dojo.isIE){ 
		var _trySetKeyCode = function(e, code){
			try{
				// squelch errors when keyCode is read-only
				// (e.g. if keyCode is ctrl or shift)
				return (e.keyCode = code);
			}catch(e){
				return 0;
			}
		}

		// by default, use the standard listener
		var iel = dojo._listener;
		// dispatcher tracking property
		if(!dojo.config._allow_leaks){
			// custom listener that handles leak protection for DOM events
			node_listener = iel = dojo._ie_listener = {
				// support handler indirection: event handler functions are 
				// referenced here. Event dispatchers hold only indices.
				handlers: [],
				// add a listener to an object
				add: function(/*Object*/ source, /*String*/ method, /*Function*/ listener){
					source = source || dojo.global;
					var f = source[method];
					if(!f||!f._listeners){
						var d = dojo._getIeDispatcher();
						// original target function is special
						d.target = f && (ieh.push(f) - 1);
						// dispatcher holds a list of indices into handlers table
						d._listeners = [];
						// redirect source to dispatcher
						f = source[method] = d;
					}
					return f._listeners.push(ieh.push(listener) - 1) ; /*Handle*/
				},
				// remove a listener from an object
				remove: function(/*Object*/ source, /*String*/ method, /*Handle*/ handle){
					var f = (source||dojo.global)[method], l = f && f._listeners;
					if(f && l && handle--){
						delete ieh[l[handle]];
						delete l[handle];
					}
				}
			};
			// alias used above
			var ieh = iel.handlers;
		}

		dojo.mixin(del, {
			add: function(/*DOMNode*/node, /*String*/event, /*Function*/fp){
				if(!node){return;} // undefined
				event = del._normalizeEventName(event);
				if(event=="onkeypress"){
					// we need to listen to onkeydown to synthesize
					// keypress events that otherwise won't fire
					// on IE
					var kd = node.onkeydown;
					if(!kd || !kd._listeners || !kd._stealthKeydownHandle){
						var h = del.add(node, "onkeydown", del._stealthKeyDown);
						kd = node.onkeydown;
						kd._stealthKeydownHandle = h;
						kd._stealthKeydownRefs = 1;
					}else{
						kd._stealthKeydownRefs++;
					}
				}
				return iel.add(node, event, del._fixCallback(fp));
			},
			remove: function(/*DOMNode*/node, /*String*/event, /*Handle*/handle){
				event = del._normalizeEventName(event);
				iel.remove(node, event, handle); 
				if(event=="onkeypress"){
					var kd = node.onkeydown;
					if(--kd._stealthKeydownRefs <= 0){
						iel.remove(node, "onkeydown", kd._stealthKeydownHandle);
						delete kd._stealthKeydownHandle;