(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>  */

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 

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

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;    }  });