10 个 jQuery 代码片段

 

[代码]图片预加载

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

[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 */

[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');

[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 returnfalse;
10 });
11 });

[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 });

[代码]制作等高的列

1 varmax_height = 0;
2 $("div.col").each(function(){
3 if($(this).height() > max_height) { max_height = $(this).height(); }
4 });
5 $("div.col").height(max_height);

[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 vare ="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 <!--[iflt IE 9]>
09 <script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
10 <![endif]-->

[代码]测试浏览器是否支持某些 CSS3 属性

01 varsupports = (function() {
02 vardiv = document.createElement('div'),
03 vendors ='Khtml Ms O Moz Webkit'.split(' '),
04 len = vendors.length;
05
06 returnfunction(prop) {
07 if( propindiv.style )returntrue;
08
09 prop = prop.replace(/^[a-z]/,function(val) {
10 returnval.toUpperCase();
11 });
12
13 while(len--) {
14 if( vendors[len] + propindiv.style ) {
15 // browser supports box-shadow. Do what you need.
16 // Or use a bang (!) to test if the browser doesn't.
17 returntrue;
18 }
19 }
20 returnfalse;
21 };
22 })();
23
24 if( supports('textShadow') ) {
25 document.documentElement.className +=' textShadow';

[代码]获取 URL 中传递的参数

1 $.urlParam =function(name){
2 varresults =newRegExp('[\\?&]'+ name +'=([^&#]*)').exec(window.location.href);
3 if(!results) {return0; }
4 returnresults[1] || 0;
5 }

[代码]禁用表单的回车键提交

1 $("#form").keypress(function(e) {
2 if(e.which == 13) {
3 returnfalse;
4 }
5 });