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>
*/

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;
 }
});