10 个很棒的 jQuery 代码片段
1、图片预加载
(function($) { var cache = []; // Arguments are image paths relative to the current page. $.preLoadImages = function() { var args_len = arguments.length; for (var i = args_len; i--;) { var cacheImage = document.createElement('img'); cacheImage.src = arguments[i]; cache.push(cacheImage); } }jQuery.preLoadImages("image1.gif", "/path/to/image2.png");?
2、在新窗口打开链接 (target=”blank”)
$('a[rel='external']').click(function(){ this.target = "_blank";});/* Usage: <a href="http://www.catswhocode.com" rel="external">catswhocode.com</a>*/?
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3、当支持 JavaScript 时为 body 增加 class
/* 该代码只有1行，但是最简单的用来检测浏览器是否支持 JavaScript 的方法，如果支持 JavaScript 就在 body 元素增加一个 hasJS 的 class */$('body').addClass('hasJS');?
4、平滑滚动页面到某个锚点
$(document).ready(function() {$("a.topLink").click(function() {$("html, body").animate({scrollTop: $($(this).attr("href")).offset().top + "px"}, {duration: 500,easing: "swing"});return false;});});?
5、鼠标滑动时的渐入和渐出
$(document).ready(function(){ $(".thumbs img").fadeTo("slow", 0.6); // This sets the opacity of the thumbs to fade down to 60% when the page loads $(".thumbs img").hover(function(){ $(this).fadeTo("slow", 1.0); // This should set the opacity to 100% on hover },function(){ $(this).fadeTo("slow", 0.6); // This should set the opacity back to 60% on mouseout });});?
6、制作等高的列
$(document).ready(function(){ $(".thumbs img").fadeTo("slow", 0.6); // This sets the opacity of the thumbs to fade down to 60% when the page loads $(".thumbs img").hover(function(){ $(this).fadeTo("slow", 1.0); // This should set the opacity to 100% on hover },function(){ $(this).fadeTo("slow", 0.6); // This should set the opacity back to 60% on mouseout });});?
7、在一些老的浏览器上启用 HTML5 的支持
(function(){ if(!/*@cc_on!@*/0) return; var e = "abbr,article,aside,audio,bb,canvas,datagrid,datalist,details,dialog,eventsource,figure,footer,header,hgroup,mark,menu,meter,nav,output,progress,section,time,video".split(','),i=e.length;while(i--){document.createElement(e[i])}})()//然后在head中引入该js<!--[if lt IE 9]><script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script><![endif]-->?
8、测试浏览器是否支持某些 CSS3 属性
var supports = (function() { var div = document.createElement('div'), vendors = 'Khtml Ms O Moz Webkit'.split(' '), len = vendors.length; return function(prop) { if ( prop in div.style ) return true; prop = prop.replace(/^[a-z]/, function(val) { return val.toUpperCase(); }); while(len--) { if ( vendors[len] + prop in div.style ) { // browser supports box-shadow. Do what you need. // Or use a bang (!) to test if the browser doesn't. return true; } } return false; };})();if ( supports('textShadow') ) { document.documentElement.className += ' textShadow';?
9、获取 URL 中传递的参数
$.urlParam = function(name){var results = new RegExp('[\\?&]' + name + '=([^&#]*)').exec(window.location.href);if (!results) { return 0; }return results[1] || 0;}?
10、禁用表单的回车键提交
$("#form").keypress(function(e) { if (e.which == 13) { return false; }});??
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