分享一下10个常用jquery片段

(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");

2. 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>
*/

3. 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');

4. 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;
});
});

5. 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
});
});

6. 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);

7. 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]-->

8. 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';

9. 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;
}

10. 禁用表单的回车键提交

$("#form").keypress(function(e) {
if (e.which == 13) {
return false;
}
});

http://www.open-open.com/code/view/1439432223083