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"); 

 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> */

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');

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;  }); });

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     }); });

 制作等高的列

  var max_height = 0; $("div.col").each(function(){     if ($(this).height() > max_height) { max_height = $(this).height(); } }); $("div.col").height(max_height);

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]-->

 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';

 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; }

禁用表单的回车键提交

  $("#form").keypress(function(e) {   if (e.which == 13) {     return false;   } });