10 个很棒的 jQuery 代码片段

http://www.catswhocode.com/blog/10-awesome-jquery-snippets 

1. [代码]图片预加载     

01 (function($) {
02   var cache = [];
03   // Arguments are image paths relative to the current page.
04   $.preLoadImages = function() {
05     var args_len = arguments.length;
06     for (var i = args_len; i--;) {
07       var cacheImage = document.createElement('img');
08       cacheImage.src = arguments[i];
09       cache.push(cacheImage);
10     }
11   }
12  
13 jQuery.preLoadImages("image1.gif", "/path/to/image2.png");

2. [代码]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 */

3. [代码]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');

4. [代码]平滑滚动页面到某个锚点     

01 $(document).ready(function() {
02     $("a.topLink").click(function() {
03         $("html, body").animate({
04             scrollTop: $($(this).attr("href")).offset().top + "px"
05         }, {
06             duration: 500,
07             easing: "swing"
08         });
09         return false;
10     });
11 });

5. [代码]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 });

6. [代码]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);

7. [代码]在一些老的浏览器上启用 HTML5 的支持     

01 (function(){
02     if(!/*@cc_on!@*/0)
03         return;
04     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])}
05 })()
06  
07 //然后在head中引入该js
08 <!--[if lt IE 9]>
09 <script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
10 <![endif]-->

8. [代码]测试浏览器是否支持某些 CSS3 属性     

01 var supports = (function() {
02    var div = document.createElement('div'),
03       vendors = 'Khtml Ms O Moz Webkit'.split(' '),
04       len = vendors.length;
05  
06    return function(prop) {
07       if ( prop in div.style ) return true;
08  
09       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';

9. [代码]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 }

10. [代码]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 });
posted @ 2014-03-23 19:45  SteveW  阅读(101)  评论(0)    收藏  举报