10个很棒的JQuery代码片段

1，图片预加载

          function($){

       var cache=[ ];

        $.preLoadImages=function(){

       var  args_len=arguments.length;

       for(var i=args_len;i--;){

         var cacheIamge=document.createElement('img');

         cacheImage.src=arguments[i];

          cache.push(cacheImage); 

        }

        }

  JQuery.preLoadImage("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

});