jquery.js

jQuery即学即用

			var scripts = jQuery( [] );

			jQuery.each(elems, function(){
				var elem = clone ?
					this.cloneNode( true ) :
					this;

				if ( jQuery.nodeName( elem, "script" ) ) {

					// If scripts are waiting to be executed, wait on this script as well
					if ( scripts.length )
						scripts = scripts.add( elem );

					// If nothing is waiting to be executed, run immediately
					else
						evalScript( 0, elem );

				} else {
					// Remove any inner scripts for later evaluation
					if ( elem.nodeType == 1 )
						scripts = scripts.add( jQuery( "script", elem ).remove() );

					// Inject the elements into the document
					callback.call( obj, elem );
				}
			});

			scripts.each( evalScript );
		});
	}
};

function evalScript( i, elem ) {
	if ( elem.src )
		jQuery.ajax({
			url: elem.src,
			async: false,
			dataType: "script"
		});

	else
		jQuery.globalEval( elem.text || elem.textContent || elem.innerHTML || "" );

	if ( elem.parentNode )
		elem.parentNode.removeChild( elem );
}

jQuery.extend = jQuery.fn.extend = function() {
	// copy reference to target object
	var target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, options;

	// Handle a deep copy situation
	if ( target.constructor == Boolean ) {
		deep = target;
		target = arguments[1] || {};
	}

	// extend jQuery itself if only one argument is passed
	if ( length == 1 ) {
		target = this;
		i = 0;
	}

	for ( ; i < length; i++ )
		// Only deal with non-null/undefined values
		if ( (options = arguments[ i ]) != null )
			// Extend the base object
			for ( var name in options ) {
				// Prevent never-ending loop
				if ( target == options[ name ] )
					continue;

				// Recurse if we're merging object values
				if ( deep && typeof options[ name ] == "object" && target[ name ] && !options[ name ].nodeType )
					jQuery.extend( target[ name ], options[ name ] );

				// Don't bring in undefined values
				else if ( options[ name ] != undefined )
					target[ name ] = options[ name ];

			}

	// Return the modified object
	return target;
};

var expando = "jQuery" + (new Date()).getTime(), uuid = 0, windowData = {};

// exclude the following css properties to add px
var exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i;

jQuery.extend({
	noConflict: function( deep ) {
		window.$ = _$;

		if ( deep )
			window.jQuery = _jQuery;

		return jQuery;
	},

	// This may seem like some crazy code, but trust me when I say that this
	// is the only cross-browser way to do this. --John
	isFunction: function( fn ) {
		return !!fn && typeof fn != "string" && !fn.nodeName && 
			fn.constructor != Array && /function/i.test( fn + "" );
	},
	
	// check if an element is in a (or is an) XML document
	isXMLDoc: function( elem ) {
		return elem.documentElement && !elem.body ||
			elem.tagName && elem.ownerDocument && !elem.ownerDocument.body;
	},

	// Evalulates a script in a global context
	// Evaluates Async. in Safari 2 :-(
	globalEval: function( data ) {
		data = jQuery.trim( data );

		if ( data ) {
			// Inspired by code by Andrea Giammarchi
			// http://webreflection.blogspot.com/2007/08/global-scope-evaluation-and-dom.html
			var head = document.getElementsByTagName("head")[0] || document.documentElement,
				script = document.createElement("script");

			script.type = "text/javascript";
			if ( jQuery.browser.msie )
				script.text = data;
			else
				script.appendChild( document.createTextNode( data ) );

			head.appendChild( script );
			head.removeChild( script );
		}
	},

	nodeName: function( elem, name ) {
		return elem.nodeName && elem.nodeName.toUpperCase() == name.toUpperCase();
	},
	
	cache: {},
	
	data: function( elem, name, data ) {
		elem = elem == window ?
			windowData :
			elem;

		var id = elem[ expando ];

		// Compute a unique ID for the element
		if ( !id ) 
			id = elem[ expando ] = ++uuid;

		// Only generate the data cache if we're
		// trying to access or manipulate it
		if ( name && !jQuery.cache[ id ] )
			jQuery.cache[ id ] = {};
		
		// Prevent overriding the named cache with undefined values
		if ( data != undefined )
			jQuery.cache[ id ][ name ] = data;
		
		// Return the named cache data, or the ID for the element	
		return name ?
			jQuery.cache[ id ][ name ] :
			id;
	},
	
	removeData: function( elem, name ) {
		elem = elem == window ?
			windowData :
			elem;

		var id = elem[ expando ];

		// If we want to remove a specific section of the element's data
		if ( name ) {
			if ( jQuery.cache[ id ] ) {
				// Remove the section of cache data
				delete jQuery.cache[ id ][ name ];

				// If we've removed all the data, remove the element's cache
				name = "";

				for ( name in jQuery.cache[ id ] )
					break;

				if ( !name )
					jQuery.removeData( elem );
			}

		// Otherwise, we want to remove all of the element's data
		} else {
			// Clean up the element expando
			try {
				delete elem[ expando ];
			} catch(e){
				// IE has trouble directly removing the expando
				// but it's ok with using removeAttribute
				if ( elem.removeAttribute )
					elem.removeAttribute( expando );
			}

			// Completely remove the data cache
			delete jQuery.cache[ id ];
		}
	},

	// args is for internal usage only
	each: function( object, callback, args ) {
		if ( args ) {
			if ( object.length == undefined )
				for ( var name in object )
					callback.apply( object[ name ], args );
			else
				for ( var i = 0, length = object.length; i < length; i++ )
					if ( callback.apply( object[ i ], args ) === false )
						break;

		// A special, fast, case for the most common use of each
		} else {
			if ( object.length == undefined )
				for ( var name in object )
					callback.call( object[ name ], name, object[ name ] );
			else
				for ( var i = 0, length = object.length, value = object[0]; 
					i < length && callback.call( value, i, value ) !== false; value = object[++i] ){}
		}

		return object;
	},
	
	prop: function( elem, value, type, i, name ) {
			// Handle executable functions
			if ( jQuery.isFunction( value ) )
				value = value.call( elem, i );
				
			// Handle passing in a number to a CSS property
			return value && value.constructor == Number && type == "curCSS" && !exclude.test( name ) ?
				value + "px" :
				value;
	},

	className: {
		// internal only, use addClass("class")
		add: function( elem, classNames ) {
			jQuery.each((classNames || "").split(/\s+/), function(i, className){
				if ( !jQuery.className.has( elem.className, className ) )
					elem.className += (elem.className ? " " : "") + className;
			});
		},

		// internal only, use removeClass("class")
		remove: function( elem, classNames ) {
			elem.className = classNames != undefined ?
				jQuery.grep(elem.className.split(/\s+/), function(className){
					return !jQuery.className.has( classNames, className );	
				}).join(" ") :
				"";
		},

		// internal only, use is(".class")
		has: function( elem, className ) {
			return jQuery.inArray( className, (elem.className || elem).toString().split(/\s+/) ) > -1;
		}
	},

	// A method for quickly swapping in/out CSS properties to get correct calculations
	swap: function( elem, options, callback ) {
		// Remember the old values, and insert the new ones
		for ( var name in options ) {
			elem.style[ "old" + name ] = elem.style[ name ];
			elem.style[ name ] = options[ name ];
		}

		callback.call( elem );

		// Revert the old values
		for ( var name in options )
			elem.style[ name ] = elem.style[ "old" + name ];
	},

	css: function( elem, name ) {
		if ( name == "height" || name == "width" ) {
			var old = {}, height, width;

			// Revert the padding and border widths to get the
			// correct height/width values
			jQuery.each([ "Top", "Bottom", "Right", "Left" ], function(){
				old[ "padding" + this ] = 0;
				old[ "border" + this + "Width" ] = 0;
			});

			// Swap out the padding/border values temporarily
			jQuery.swap( elem, old, function() {

				// If the element is visible, then the calculation is easy
				if ( jQuery( elem ).is(":visible") ) {
					height = elem.offsetHeight;
					width = elem.offsetWidth;

				// Otherwise, we need to flip out more values
				} else {
					elem = jQuery( elem.cloneNode(true) )
						.find(":radio").removeAttr("checked").end()
						.css({
							visibility: "hidden",
							position: "absolute",
							display: "block",
							right: "0",
							left: "0"
						}).appendTo( elem.parentNode )[0];

					var position = jQuery.css( elem.parentNode, "position" ) || "static";
					if ( position == "static" )
						elem.parentNode.style.position = "relative";

					height = elem.clientHeight;
					width = elem.clientWidth;

					if ( position == "static" )
						elem.parentNode.style.position = "static";

					elem.parentNode.removeChild( elem );
				}
			});

			return name == "height" ?
				height :
				width;
		}

		return jQuery.curCSS( elem, name );
	},

	curCSS: function( elem, name, force ) {
		var ret;

		// A helper method for determining if an element's values are broken
		function color( elem ) {
			if ( !jQuery.browser.safari )
				return false;

			var ret = document.defaultView.getComputedStyle( elem, null );
			return !ret || ret.getPropertyValue("color") == "";
		}

		// We need to handle opacity special in IE
		if ( name == "opacity" && jQuery.browser.msie ) {
			ret = jQuery.attr( elem.style, "opacity" );

			return ret == "" ?
				"1" :
				ret;
		}
		
		// Make sure we're using the right name for getting the float value
		if ( name.match( /float/i ) )
			name = styleFloat;

		if ( !force && elem.style[ name ] )
			ret = elem.style[ name ];

		else if ( document.defaultView && document.defaultView.getComputedStyle ) {

			// Only "float" is needed here
			if ( name.match( /float/i ) )
				name = "float";

			name = name.replace( /([A-Z])/g, "-$1" ).toLowerCase();

			var getComputedStyle = document.defaultView.getComputedStyle( elem, null );

			if ( getComputedStyle && !color( elem ) )
				ret = getComputedStyle.getPropertyValue( name );

			// If the element isn't reporting its values properly in Safari
			// then some display: none elements are involved
			else {
				var swap = [], stack = [];

				// Locate all of the parent display: none elements
				for ( var a = elem; a && color(a); a = a.parentNode )
					stack.unshift(a);

				// Go through and make them visible, but in reverse
				// (It would be better if we knew the exact display type that they had)
				for ( var i = 0; i < stack.length; i++ )
					if ( color( stack[ i ] ) ) {
						swap[ i ] = stack[ i ].style.display;
						stack[ i ].style.display = "block";
					}

				// Since we flip the display style, we have to handle that
				// one special, otherwise get the value
				ret = name == "display" && swap[ stack.length - 1 ] != null ?
					"none" :
					( getComputedStyle && getComputedStyle.getPropertyValue( name ) ) || "";

				// Finally, revert the display styles back
				for ( var i = 0; i < swap.length; i++ )
					if ( swap[ i ] != null )
						stack[ i ].style.display = swap[ i ];
			}

			// We should always get a number back from opacity
			if ( name == "opacity" && ret == "" )
				ret = "1";

		} else if ( elem.currentStyle ) {
			var camelCase = name.replace(/\-(\w)/g, function(all, letter){
				return letter.toUpperCase();
			});

			ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];

			// From the awesome hack by Dean Edwards
			// http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291

			// If we're not dealing with a regular pixel number
			// but a number that has a weird ending, we need to convert it to pixels
			if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) {
				// Remember the original values
				var style = elem.style.left, runtimeStyle = elem.runtimeStyle.left;

				// Put in the new values to get a computed value out
				elem.runtimeStyle.left = elem.currentStyle.left;
				elem.style.left = ret || 0;
				ret = elem.style.pixelLeft + "px";

				// Revert the changed values
				elem.style.left = style;
				elem.runtimeStyle.left = runtimeStyle;
			}
		}

		return ret;
	},
	
	clean: function( elems, context ) {
		var ret = [];
		context = context || document;

		jQuery.each(elems, function(i, elem){
			if ( !elem )
				return;

			if ( elem.constructor == Number )
				elem = elem.toString();
			
			// Convert html string into DOM nodes
			if ( typeof elem == "string" ) {
				// Fix "XHTML"-style tags in all browsers
				elem = elem.replace(/(<(\w+)[^>]*?)\/>/g, function(all, front, tag){
					return tag.match(/^(abbr|br|col|img|input|link|meta|param|hr|area)$/i) ?
						all :
						front + "></" + tag + ">";
				});

				// Trim whitespace, otherwise indexOf won't work as expected
				var tags = jQuery.trim( elem ).toLowerCase(), div = context.createElement("div");