jQuerymousemove为我触发了每个事件。
我如何让它停止这样做？
似乎 jQuery 1.2.6 没有这种行为，但 1.4 和 1.5 有。
Stackoverflow.com 也做同样的事情。想知道发生了什么变化。
jQuery 事件代码：
/*
* A number of helper functions used for managing events.
* Many of the ideas behind this code originated from
* Dean Edwards' addEvent library.
*/
jQuery.event = {
// Bind an event to an element
// Original by Dean Edwards
add: function( elem, types, handler, data ) {
if ( elem.nodeType === 3 || elem.nodeType === 8 ) {
return;
}
// TODO :: Use a try/catch until it's safe to pull this out (likely 1.6)
// Minor release fix for bug #8018
try {
// For whatever reason, IE has trouble passing the window object
// around, causing it to be cloned in the process
if ( jQuery.isWindow( elem ) && ( elem !== window && !elem.frameElement ) ) {
elem = window;
}
}
catch ( e ) {}
if ( handler === false ) {
handler = returnFalse;
} else if ( !handler ) {
// Fixes bug #7229. Fix recommended by jdalton
return;
}
var handleObjIn, handleObj;
if ( handler.handler ) {
handleObjIn = handler;
handler = handleObjIn.handler;
}
// Make sure that the function being executed has a unique ID
if ( !handler.guid ) {
handler.guid = jQuery.guid++;
}
// Init the element's event structure
var elemData = jQuery._data( elem );
// If no elemData is found then we must be trying to bind to one of the
// banned noData elements
if ( !elemData ) {
return;
}
var events = elemData.events,
eventHandle = elemData.handle;
if ( !events ) {
elemData.events = events = {};
}
if ( !eventHandle ) {
elemData.handle = eventHandle = function( e ) {
// Handle the second event of a trigger and when
// an event is called after a page has unloaded
return typeof jQuery !== "undefined" && jQuery.event.triggered !== e.type ?
jQuery.event.handle.apply( eventHandle.elem, arguments ) :
undefined;
};
}
// Add elem as a property of the handle function
// This is to prevent a memory leak with non-native events in IE.
eventHandle.elem = elem;
// Handle multiple events separated by a space
// jQuery(...).bind("mouseover mouseout", fn);
types = types.split(" ");
var type, i = 0, namespaces;
while ( (type = types[ i++ ]) ) {
handleObj = handleObjIn ?
jQuery.extend({}, handleObjIn) :
{ handler: handler, data: data };
// Namespaced event handlers
if ( type.indexOf(".") > -1 ) {
namespaces = type.split(".");
type = namespaces.shift();
handleObj.namespace = namespaces.slice(0).sort().join(".");
} else {
namespaces = [];
handleObj.namespace = "";
}
handleObj.type = type;
if ( !handleObj.guid ) {
handleObj.guid = handler.guid;
}
// Get the current list of functions bound to this event
var handlers = events[ type ],
special = jQuery.event.special[ type ] || {};
// Init the event handler queue
if ( !handlers ) {
handlers = events[ type ] = [];
// Check for a special event handler
// Only use addEventListener/attachEvent if the special
// events handler returns false
if ( !special.setup || special.setup.call( elem, data, namespaces, eventHandle ) === false ) {
// Bind the global event handler to the element
if ( elem.addEventListener ) {
elem.addEventListener( type, eventHandle, false );
} else if ( elem.attachEvent ) {
elem.attachEvent( "on" + type, eventHandle );
}
}
}
if ( special.add ) {
special.add.call( elem, handleObj );
if ( !handleObj.handler.guid ) {
handleObj.handler.guid = handler.guid;
}
}
// Add the function to the element's handler list
handlers.push( handleObj );
// Keep track of which events have been used, for global triggering
jQuery.event.global[ type ] = true;
}
// Nullify elem to prevent memory leaks in IE
elem = null;
},
global: {},
// Detach an event or set of events from an element
remove: function( elem, types, handler, pos ) {
// don't do events on text and comment nodes
if ( elem.nodeType === 3 || elem.nodeType === 8 ) {
return;
}
if ( handler === false ) {
handler = returnFalse;
}
var ret, type, fn, j, i = 0, all, namespaces, namespace, special, eventType, handleObj, origType,
elemData = jQuery.hasData( elem ) && jQuery._data( elem ),
events = elemData && elemData.events;
if ( !elemData || !events ) {
return;
}
// types is actually an event object here
if ( types && types.type ) {
handler = types.handler;
types = types.type;
}
// Unbind all events for the element
if ( !types || typeof types === "string" && types.charAt(0) === "." ) {
types = types || "";
for ( type in events ) {
jQuery.event.remove( elem, type + types );
}
return;
}
// Handle multiple events separated by a space
// jQuery(...).unbind("mouseover mouseout", fn);
types = types.split(" ");
while ( (type = types[ i++ ]) ) {
origType = type;
handleObj = null;
all = type.indexOf(".") < 0;
namespaces = [];
if ( !all ) {
// Namespaced event handlers
namespaces = type.split(".");
type = namespaces.shift();
namespace = new RegExp("(^|\\.)" +
jQuery.map( namespaces.slice(0).sort(), fcleanup ).join("\\.(?:.*\\.)?") + "(\\.|$)");
}
eventType = events[ type ];
if ( !eventType ) {
continue;
}
if ( !handler ) {
for ( j = 0; j < eventType.length; j++ ) {
handleObj = eventType[ j ];
if ( all || namespace.test( handleObj.namespace ) ) {
jQuery.event.remove( elem, origType, handleObj.handler, j );
eventType.splice( j--, 1 );
}
}
continue;
}
special = jQuery.event.special[ type ] || {};
for ( j = pos || 0; j < eventType.length; j++ ) {
handleObj = eventType[ j ];
if ( handler.guid === handleObj.guid ) {
// remove the given handler for the given type
if ( all || namespace.test( handleObj.namespace ) ) {
if ( pos == null ) {
eventType.splice( j--, 1 );
}
if ( special.remove ) {
special.remove.call( elem, handleObj );
}
}
if ( pos != null ) {
break;
}
}
}
// remove generic event handler if no more handlers exist
if ( eventType.length === 0 || pos != null && eventType.length === 1 ) {
if ( !special.teardown || special.teardown.call( elem, namespaces ) === false ) {
jQuery.removeEvent( elem, type, elemData.handle );
}
ret = null;
delete events[ type ];
}
}
// Remove the expando if it's no longer used
if ( jQuery.isEmptyObject( events ) ) {
var handle = elemData.handle;
if ( handle ) {
handle.elem = null;
}
delete elemData.events;
delete elemData.handle;
if ( jQuery.isEmptyObject( elemData ) ) {
jQuery.removeData( elem, undefined, true );
}
}
},
// bubbling is internal
trigger: function( event, data, elem /*, bubbling */ ) {
// Event object or event type
var type = event.type || event,
bubbling = arguments[3];
if ( !bubbling ) {
event = typeof event === "object" ?
// jQuery.Event object
event[ jQuery.expando ] ? event :
// Object literal
jQuery.extend( jQuery.Event(type), event ) :
// Just the event type (string)
jQuery.Event(type);
if ( type.indexOf("!") >= 0 ) {
event.type = type = type.slice(0, -1);
event.exclusive = true;
}
// Handle a global trigger
if ( !elem ) {
// Don't bubble custom events when global (to avoid too much overhead)
event.stopPropagation();
// Only trigger if we've ever bound an event for it
if ( jQuery.event.global[ type ] ) {
// XXX This code smells terrible. event.js should not be directly
// inspecting the data cache
jQuery.each( jQuery.cache, function() {
// internalKey variable is just used to make it easier to find
// and potentially change this stuff later; currently it just
// points to jQuery.expando
var internalKey = jQuery.expando,
internalCache = this[ internalKey ];
if ( internalCache && internalCache.events && internalCache.events[ type ] ) {
jQuery.event.trigger( event, data, internalCache.handle.elem );
}
});
}
}
// Handle triggering a single element
// don't do events on text and comment nodes
if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 ) {
return undefined;
}
// Clean up in case it is reused
event.result = undefined;
event.target = elem;
// Clone the incoming data, if any
data = jQuery.makeArray( data );
data.unshift( event );
}
event.currentTarget = elem;
// Trigger the event, it is assumed that "handle" is a function
var handle = jQuery._data( elem, "handle" );
if ( handle ) {
handle.apply( elem, data );
}
var parent = elem.parentNode || elem.ownerDocument;
// Trigger an inline bound script
try {
if ( !(elem && elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()]) ) {
if ( elem[ "on" + type ] && elem[ "on" + type ].apply( elem, data ) === false ) {
event.result = false;
event.preventDefault();
}
}
// prevent IE from throwing an error for some elements with some event types, see #3533
} catch (inlineError) {}
if ( !event.isPropagationStopped() && parent ) {
jQuery.event.trigger( event, data, parent, true );
} else if ( !event.isDefaultPrevented() ) {
var old,
target = event.target,
targetType = type.replace( rnamespaces, "" ),
isClick = jQuery.nodeName( target, "a" ) && targetType === "click",
special = jQuery.event.special[ targetType ] || {};
if ( (!special._default || special._default.call( elem, event ) === false) &&
!isClick && !(target && target.nodeName && jQuery.noData[target.nodeName.toLowerCase()]) ) {
try {
if ( target[ targetType ] ) {
// Make sure that we don't accidentally re-trigger the onFOO events
old = target[ "on" + targetType ];
if ( old ) {
target[ "on" + targetType ] = null;
}
jQuery.event.triggered = event.type;
target[ targetType ]();
}
// prevent IE from throwing an error for some elements with some event types, see #3533
} catch (triggerError) {}
if ( old ) {
target[ "on" + targetType ] = old;
}
jQuery.event.triggered = undefined;
}
}
},
handle: function( event ) {
var all, handlers, namespaces, namespace_re, events,
namespace_sort = [],
args = jQuery.makeArray( arguments );
event = args[0] = jQuery.event.fix( event || window.event );
event.currentTarget = this;
// Namespaced event handlers
all = event.type.indexOf(".") < 0 && !event.exclusive;
if ( !all ) {
namespaces = event.type.split(".");
event.type = namespaces.shift();
namespace_sort = namespaces.slice(0).sort();
namespace_re = new RegExp("(^|\\.)" + namespace_sort.join("\\.(?:.*\\.)?") + "(\\.|$)");
}
event.namespace = event.namespace || namespace_sort.join(".");
events = jQuery._data(this, "events");
handlers = (events || {})[ event.type ];
if ( events && handlers ) {
// Clone the handlers to prevent manipulation
handlers = handlers.slice(0);
for ( var j = 0, l = handlers.length; j < l; j++ ) {
var handleObj = handlers[ j ];
// Filter the functions by class
if ( all || namespace_re.test( handleObj.namespace ) ) {
// Pass in a reference to the handler function itself
// So that we can later remove it
event.handler = handleObj.handler;
event.data = handleObj.data;
event.handleObj = handleObj;
var ret = handleObj.handler.apply( this, args );
if ( ret !== undefined ) {
event.result = ret;
if ( ret === false ) {
event.preventDefault();
event.stopPropagation();
}
}
if ( event.isImmediatePropagationStopped() ) {
break;
}
}
}
}
return event.result;
},
props: "altKey attrChange attrName bubbles button cancelable charCode clientX clientY ctrlKey currentTarget data detail eventPhase fromElement handler keyCode layerX layerY metaKey newValue offsetX offsetY pageX pageY prevValue relatedNode relatedTarget screenX screenY shiftKey srcElement target toElement view wheelDelta which".split(" "),
fix: function( event ) {
if ( event[ jQuery.expando ] ) {
return event;
}
// store a copy of the original event object
// and "clone" to set read-only properties
var originalEvent = event;
event = jQuery.Event( originalEvent );
for ( var i = this.props.length, prop; i; ) {
prop = this.props[ --i ];
event[ prop ] = originalEvent[ prop ];
}
// Fix target property, if necessary
if ( !event.target ) {
// Fixes #1925 where srcElement might not be defined either
event.target = event.srcElement || document;
}
// check if target is a textnode (safari)
if ( event.target.nodeType === 3 ) {
event.target = event.target.parentNode;
}
// Add relatedTarget, if necessary
if ( !event.relatedTarget && event.fromElement ) {
event.relatedTarget = event.fromElement === event.target ? event.toElement : event.fromElement;
}
// Calculate pageX/Y if missing and clientX/Y available
if ( event.pageX == null && event.clientX != null ) {
var doc = document.documentElement,
body = document.body;
event.pageX = event.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc && doc.clientLeft || body && body.clientLeft || 0);
event.pageY = event.clientY + (doc && doc.scrollTop || body && body.scrollTop || 0) - (doc && doc.clientTop || body && body.clientTop || 0);
}
// Add which for key events
if ( event.which == null && (event.charCode != null || event.keyCode != null) ) {
event.which = event.charCode != null ? event.charCode : event.keyCode;
}
// Add metaKey to non-Mac browsers (use ctrl for PC's and Meta for Macs)
if ( !event.metaKey && event.ctrlKey ) {
event.metaKey = event.ctrlKey;
}
// Add which for click: 1 === left; 2 === middle; 3 === right
// Note: button is not normalized, so don't use it
if ( !event.which && event.button !== undefined ) {
event.which = (event.button & 1 ? 1 : ( event.button & 2 ? 3 : ( event.button & 4 ? 2 : 0 ) ));
}
return event;
},
// Deprecated, use jQuery.guid instead
guid: 1E8,
// Deprecated, use jQuery.proxy instead
proxy: jQuery.proxy,
special: {
ready: {
// Make sure the ready event is setup
setup: jQuery.bindReady,
teardown: jQuery.noop
},
live: {
add: function( handleObj ) {
jQuery.event.add( this,
liveConvert( handleObj.origType, handleObj.selector ),
jQuery.extend({}, handleObj, {handler: liveHandler, guid: handleObj.handler.guid}) );
},
remove: function( handleObj ) {
jQuery.event.remove( this, liveConvert( handleObj.origType, handleObj.selector ), handleObj );
}
},
beforeunload: {
setup: function( data, namespaces, eventHandle ) {
// We only want to do this special case on windows
if ( jQuery.isWindow( this ) ) {
this.onbeforeunload = eventHandle;
}
},
teardown: function( namespaces, eventHandle ) {
if ( this.onbeforeunload === eventHandle ) {
this.onbeforeunload = null;
}
}
}
}
};
澄清一下，我不喜欢这种行为。我认为这是不必要的，特别是如果我从不打算首先使用 mousemove。
这种事情在某些情况下很重要。