jquery-1.2.js

里面包括了一些javascript的常用用法

		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 ? win : 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( obj, fn, args ) {
		if ( args ) {
			if ( obj.length == undefined )
				for ( var i in obj )
					fn.apply( obj[i], args );
			else
				for ( var i = 0, ol = obj.length; i < ol; i++ )
					if ( fn.apply( obj[i], args ) === false ) break;

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

		return obj;
	},
	
	prop: function(elem, value, type, index, prop){
			// Handle executable functions
			if ( jQuery.isFunction( value ) )
				value = value.call( elem, [index] );
				
			// exclude the following css properties to add px
			var exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i;

			// Handle passing in a number to a CSS property
			return value && value.constructor == Number && type == "curCSS" && !exclude.test(prop) ?
				value + "px" :
				value;
	},

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

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

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

	swap: function(e,o,f) {
		for ( var i in o ) {
			e.style["old"+i] = e.style[i];
			e.style[i] = o[i];
		}
		f.apply( e, [] );
		for ( var i in o )
			e.style[i] = e.style["old"+i];
	},

	css: function(e,p) {
		if ( p == "height" || p == "width" ) {
			var old = {}, oHeight, oWidth, d = ["Top","Bottom","Right","Left"];

			jQuery.each( d, function(){
				old["padding" + this] = 0;
				old["border" + this + "Width"] = 0;
			});

			jQuery.swap( e, old, function() {
				if ( jQuery(e).is(':visible') ) {
					oHeight = e.offsetHeight;
					oWidth = e.offsetWidth;
				} else {
					e = jQuery(e.cloneNode(true))
						.find(":radio").removeAttr("checked").end()
						.css({
							visibility: "hidden", position: "absolute", display: "block", right: "0", left: "0"
						}).appendTo(e.parentNode)[0];

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

					oHeight = e.clientHeight;
					oWidth = e.clientWidth;

					if ( parPos == "static" )
						e.parentNode.style.position = "static";

					e.parentNode.removeChild(e);
				}
			});

			return p == "height" ? oHeight : oWidth;
		}

		return jQuery.curCSS( e, p );
	},

	curCSS: function(elem, prop, force) {
		var ret, stack = [], swap = [];

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

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

		if (prop == "opacity" && jQuery.browser.msie) {
			ret = jQuery.attr(elem.style, "opacity");
			return ret == "" ? "1" : ret;
		}
		
		if (prop.match(/float/i))
			prop = styleFloat;

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

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

			if (prop.match(/float/i))
				prop = "float";

			prop = prop.replace(/([A-Z])/g,"-$1").toLowerCase();
			var cur = document.defaultView.getComputedStyle(elem, null);

			if ( cur && !color(elem) )
				ret = cur.getPropertyValue(prop);

			// If the element isn't reporting its values properly in Safari
			// then some display: none elements are involved
			else {
				// 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 ( a = 0; a < stack.length; a++ )
					if ( color(stack[a]) ) {
						swap[a] = stack[a].style.display;
						stack[a].style.display = "block";
					}

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

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

			if ( prop == "opacity" && ret == "" )
				ret = "1";

		} else if (elem.currentStyle) {
			var newProp = prop.replace(/\-(\w)/g,function(m,c){return c.toUpperCase();});
			ret = elem.currentStyle[prop] || elem.currentStyle[newProp];

			// 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) ) {
				var style = elem.style.left;
				var runtimeStyle = elem.runtimeStyle.left;
				elem.runtimeStyle.left = elem.currentStyle.left;
				elem.style.left = ret || 0;
				ret = elem.style.pixelLeft + "px";
				elem.style.left = style;
				elem.runtimeStyle.left = runtimeStyle;
			}
		}

		return ret;
	},
	
	clean: function(a, doc) {
		var r = [];
		doc = doc || document;

		jQuery.each( a, function(i,arg){
			if ( !arg ) return;

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

				// Trim whitespace, otherwise indexOf won't work as expected
				var s = jQuery.trim(arg).toLowerCase(), div = doc.createElement("div"), tb = [];

				var wrap =
					// option or optgroup
					!s.indexOf("<opt") &&
					[1, "<select>", "</select>"] ||
					
					!s.indexOf("<leg") &&
					[1, "<fieldset>", "</fieldset>"] ||
					
					s.match(/^<(thead|tbody|tfoot|colg|cap)/) &&
					[1, "<table>", "</table>"] ||
					
					!s.indexOf("<tr") &&
					[2, "<table><tbody>", "</tbody></table>"] ||
					
				 	// <thead> matched above
					(!s.indexOf("<td") || !s.indexOf("<th")) &&
					[3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
					
					!s.indexOf("<col") &&
					[2, "<table><tbody></tbody><colgroup>", "</colgroup></table>"] ||

					// IE can't serialize <link> and <script> tags normally
					jQuery.browser.msie &&
					[1, "div<div>", "</div>"] ||
					
					[0,"",""];

				// Go to html and back, then peel off extra wrappers
				div.innerHTML = wrap[1] + arg + wrap[2];
				
				// Move to the right depth
				while ( wrap[0]-- )
					div = div.lastChild;
				
				// Remove IE's autoinserted <tbody> from table fragments
				if ( jQuery.browser.msie ) {
					
					// String was a <table>, *may* have spurious <tbody>
					if ( !s.indexOf("<table") && s.indexOf("<tbody") < 0 ) 
						tb = div.firstChild && div.firstChild.childNodes;
						
					// String was a bare <thead> or <tfoot>
					else if ( wrap[1] == "<table>" && s.indexOf("<tbody") < 0 )
						tb = div.childNodes;

					for ( var n = tb.length-1; n >= 0 ; --n )
						if ( jQuery.nodeName(tb[n], "tbody") && !tb[n].childNodes.length )
							tb[n].parentNode.removeChild(tb[n]);
	
					// IE completely kills leading whitespace when innerHTML is used	
					if ( /^\s/.test(arg) )	
						div.insertBefore( doc.createTextNode( arg.match(/^\s*/)[0] ), div.firstChild );

				}
				
				arg = jQuery.makeArray( div.childNodes );
			}

			if ( 0 === arg.length && (!jQuery.nodeName(arg, "form") && !jQuery.nodeName(arg, "select")) )
				return;

			if ( arg[0] == undefined || jQuery.nodeName(arg, "form") || arg.options )
				r.push( arg );
			else
				r = jQuery.merge( r, arg );

		});

		return r;
	},
	
	attr: function(elem, name, value){
		var fix = jQuery.isXMLDoc(elem) ? {} : jQuery.props;

		// Safari mis-reports the default selected property of a hidden option
		// Accessing the parent's selectedIndex property fixes it
		if ( name == "selected" && jQuery.browser.safari )
			elem.parentNode.selectedIndex;
		
		// Certain attributes only work when accessed via the old DOM 0 way
		if ( fix[name] ) {
			if ( value != undefined ) elem[fix[name]] = value;
			return elem[fix[name]];
		} else if ( jQuery.browser.msie && name == "style" )
			return jQuery.attr( elem.style, "cssText", value );

		else if ( value == undefined && jQuery.browser.msie && jQuery.nodeName(elem, "form") && (name == "action" || name == "method") )
			return elem.getAttributeNode(name).nodeValue;

		// IE elem.getAttribute passes even for style
		else if ( elem.tagName ) {

			if ( value != undefined ) {
				if ( name == "type" && jQuery.nodeName(elem,"input") && elem.parentNode )
					throw "type property can't be changed";
				elem.setAttribute( name, value );
			}

			if ( jQuery.browser.msie && /href|src/.test(name) && !jQuery.isXMLDoc(elem) ) 
				return elem.getAttribute( name, 2 );

			return elem.getAttribute( name );

		// elem is actually elem.style ... set the style
		} else {
			// IE actually uses filters for opacity
			if ( name == "opacity" && jQuery.browser.msie ) {
				if ( value != undefined ) {
					// IE has trouble with opacity if it does not have layout
					// Force it by setting the zoom level
					elem.zoom = 1; 
	
					// Set the alpha filter to set the opacity
					elem.filter = (elem.filter || "").replace(/alpha\([^)]*\)/,"") +
						(parseFloat(value).toString() == "NaN" ? "" : "alpha(opacity=" + value * 100 + ")");
				}
	
				return elem.filter ? 
					(parseFloat( elem.filter.match(/opacity=([^)]*)/)[1] ) / 100).toString() : "";
			}
			name = name.replace(/-([a-z])/ig,function(z,b){return b.toUpperCase();});
			if ( value != undefined ) elem[name] = value;
			return elem[name];
		}
	},
	
	trim: function(t){
		return (t||"").replace(/^\s+|\s+$/g, "");
	},

	makeArray: function( a ) {
		var r = [];

		// Need to use typeof to fight Safari childNodes crashes
		if ( typeof a != "array" )
			for ( var i = 0, al = a.length; i < al; i++ )
				r.push( a[i] );
		else
			r = a.slice( 0 );

		return r;
	},

	inArray: function( b, a ) {
		for ( var i = 0, al = a.length; i < al; i++ )
			if ( a[i] == b )
				return i;
		return -1;
	},

	merge: function(first, second) {
		// We have to loop this way because IE & Opera overwrite the length
		// expando of getElementsByTagName

		// Also, we need to make sure that the correct elements are being returned
		// (IE returns comment nodes in a '*' query)
		if ( jQuery.browser.msie ) {
			for ( var i = 0; second[i]; i++ )
				if ( second[i].nodeType != 8 )
					first.push(second[i]);
		} else
			for ( var i = 0; second[i]; i++ )
				first.push(second[i]);

		return first;
	},

	unique: function(first) {
		var r = [], done = {};

		try {
			for ( var i = 0, fl = first.length; i < fl; i++ ) {
				var id = jQuery.data(first[i]);
				if ( !done[id] ) {
					done[id] = true;
					r.push(first[i]);
				}
			}
		} catch(e) {
			r = first;
		}

		return r;
	},

	grep: function(elems, fn, inv) {
		// If a string is passed in for the function, make a function
		// for it (a handy shortcut)
		if ( typeof fn == "string" )
			fn = eval("false||function(a,i){return " + fn + "}");

		var result = [];

		// Go through the array, only saving the items
		// that pass the validator function
		for ( var i = 0, el = elems.length; i < el; i++ )
			if ( !inv && fn(elems[i],i) || inv && !fn(elems[i],i) )
				result.push( elems[i] );

		return result;
	},

	map: function(elems, fn) {
		// If a string is passed in for the function, make a function
		// for it (a handy shortcut)
		if ( typeof fn == "string" )
			fn = eval("false||function(a){return " + fn + "}");

		var result = [];

		// Go through the array, translating each of the items to their
		// new value (or values).
		for ( var i = 0, el = elems.length; i < el; i++ ) {
			var val = fn(elems[i],i);

			if ( val !== null && val != undefined ) {
				if ( val.constructor != Array ) val = [val];