jQuery即学即用

				/*				 * jQuery Form Tips 1.2.2				 * By Manuel Boy (http://www.manuelboy.de)				 * Copyright (c) 2010 Manuel Boy				 * Licensed under the MIT License: http://www.opensource.org/licenses/mit-license.php				*/				jQuery.fn.formtips = function(options) {										// handle options					settings = jQuery.extend({						tippedClass: "tipped"					}, options);										return this.each(function() {												jQuery(this).each(function() {														// prepare input elements an textareas							var e = jQuery(this);														// do not apply form tips to inputs of type file, radio or checkbox							var type = jQuery(e).attr('type');							if(type == 'file' || type == 'checkbox' || type == 'radio') { return false; }														// handle focus event							jQuery(e).bind('focus', function() {								var lv = jQuery(this).attr('title');								if(jQuery(this).val() == lv) {									jQuery(this).val('').removeClass(settings.tippedClass);								}								return false;							});														// handle blur event							jQuery(e).bind('blur', function() {								var lv = jQuery(this).attr('title');								if(jQuery(this).val() == '') {									jQuery(this).val(lv).addClass(settings.tippedClass);								}								return false;							});														// handle initial text							var lv = jQuery(e).attr('title');							if(jQuery(e).val() == '' || jQuery(e).val() == jQuery(this).attr('title')) {								jQuery(e).val(lv).addClass(settings.tippedClass);							} else {								jQuery(e).removeClass(settings.tippedClass);							}														// handle removal of default value							jQuery(e).parentsUntil('form').parent().submit(function() {								var lv = jQuery(e).attr('title');								if(jQuery(e).val() == lv) {									jQuery(e).val('').removeClass(settings.tippedClass);								}							});													});											});				};