10个很棒的jQuery代码片段

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");

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>

*/

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');

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;

});

});

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

});

});

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);

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]-->

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';

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;

}

禁用表单的回车键提交

$("#form").keypress(function(e) {

if (e.which == 13) {

return false;

}

});