图片预加载
1 (function($) {
2 var cache = [];
3 // Arguments are image paths relative to the current page.
4 $.preLoadImages = function() {
5 var args_len = arguments.length;
6 for (var i = args_len; i--;) {
7 var cacheImage = document.createElement('img');
8 cacheImage.src = arguments[i];
9 cache.push(cacheImage);
10 }
11 }
12
13 jQuery.preLoadImages("image1.gif", "/path/to/image2.png");
在新窗口打开链接 (target=”blank”)
1 $('a[@rel$='external']').click(function(){
2 this.target = "_blank";
3 });
4
5 /*
6 Usage:
7 <a href="http://www.catswhocode.com" rel="external">catswhocode.com</a>
8 */
当支持 JavaScript 时为 body 增加 class
1 /* 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 */
2 $('body').addClass('hasJS');
平滑滚动页面到某个锚点
1 $(document).ready(function() {
2 $("a.topLink").click(function() {
3 $("html, body").animate({
4 scrollTop: $($(this).attr("href")).offset().top + "px"
5 }, {
6 duration: 500,
7 easing: "swing"
8 });
9 return false;
10 });
11 });
鼠标滑动时的渐入和渐出
1 $(document).ready(function(){
2 $(".thumbs img").fadeTo("slow", 0.6); // This sets the opacity of the thumbs to fade down to 60% when the page loads
3
4 $(".thumbs img").hover(function(){
5 $(this).fadeTo("slow", 1.0); // This should set the opacity to 100% on hover
6 },function(){
7 $(this).fadeTo("slow", 0.6); // This should set the opacity back to 60% on mouseout
8 });
9 });
制作等高的列
1 var max_height = 0;
2 $("div.col").each(function(){
3 if ($(this).height() > max_height) { max_height = $(this).height(); }
4 });
5 $("div.col").height(max_height);
在一些老的浏览器上启用 HTML5 的支持
1 (function(){
2 if(!/*@cc_on!@*/0)
3 return;
4 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])}
5 })()
6
7 //然后在head中引入该js
8 <!--[if lt IE 9]>
9 <script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
10 <![endif]-->
测试浏览器是否支持某些 CSS3 属性
1 var supports = (function() {
2 var div = document.createElement('div'),
3 vendors = 'Khtml Ms O Moz Webkit'.split(' '),
4 len = vendors.length;
5
6 return function(prop) {
7 if ( prop in div.style ) return true;
8
9 prop = prop.replace(/^[a-z]/, function(val) {
10 return val.toUpperCase();
11 });
12
13 while(len--) {
14 if ( vendors[len] + prop in div.style ) {
15 // browser supports box-shadow. Do what you need.
16 // Or use a bang (!) to test if the browser doesn't.
17 return true;
18 }
19 }
20 return false;
21 };
22 })();
23
24 if ( supports('textShadow') ) {
25 document.documentElement.className += ' textShadow';
获取 URL 中传递的参数
1 $.urlParam = function(name){
2 var results = new RegExp('[\\?&]' + name + '=([^&#]*)').exec(window.location.href);
3 if (!results) { return 0; }
4 return results[1] || 0;
5 }
禁用表单的回车键提交
1 $("#form").keypress(function(e) {
2 if (e.which == 13) {
3 return false;
4 }
5 });