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上传时间: 2011-12-29
详细说明： var // Will speed up references to window, and allows munging its name. window = this, // Will speed up references to undefined, and allows munging its name. undefined, // Map over jQuery in case of overwrite _jQuery = window.jQuery, // Map over the $ in case of overwrite _$ = window.$, jQuery = window.jQuery = window.$ = function( selector, context ) { // The jQuery object is actually just the init constructor 'enhanced' return new jQuery.fn.init( selector, context ); }, // A simple way to check for HTML strin gs or ID strings // (both of which we optimize for) quickExpr = /^[^<]*(<(.|\s)+>)[^>]*$|^#([\w-]+)$/, // Is it a simple selector isSimple = /^.[^:#\[\.,]*$/; jQuery.fn = jQuery.prototype = { init: function( selector, context ) { // Make sure that a selection was provided selector = selector || document; // Handle $(DOMElement) if ( selector.nodeType ) { this[0] = selector; this.length = 1; this.context = selector; return this; } // Handle HTML strings if ( typeof selector === "string" ) { // Are we dealing with HTML string or an ID? var match = quickExpr.exec( selector ); // Verify a match, and that no context was specified for #id if ( match && (match[1] || !context) ) { // HANDLE: $(html) -> $(array) if ( match[1] ) selector = jQuery.clean( [ match[1] ], context ); // HANDLE: $("#id") else { var elem = document.getElementById( match[3] ); // Handle the case where IE and Opera return items // by name instead of ID if ( elem && elem.id != match[3] ) return jQuery().find( selector ); // Otherwise, we inject the element directly into the jQuery object var ret = jQuery( elem || [] ); ret.context = document; ret.selector = selector; return ret; } // HANDLE: $(expr, [context]) // (which is just equivalent to: $(content).find(expr) } else return jQuery( context ).find( selector ); // HANDLE: $(function) // Shortcut for document ready } else if ( jQuery.isFunction( selector ) ) return jQuery( document ).ready( selector ); // Make sure that old selector state is passed along if ( selector.selector && selector.context ) { this.selector = selector.selector; this.context = selector.context; } return this.setArray(jQuery.isArray( selector ) ? selector : jQuery.makeArray(selector)); }, ...展开收缩
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