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本文实例总结了30个经典的jQuery代码开发技巧。分享给大家供大家参考。具体如下：

1. 创建一个嵌套的过滤器

复制代码 代码如下:

.filter(":not(:has(.selected))") //去掉所有不包含class为.selected的元素

2. 重用你的元素查询

复制代码 代码如下:

var allItems = $("div.item");
var keepList = $("div#container1 div.item");
<div>class names: $(formToLookAt + " input:checked").each(function() { keepListkeepList = keepList.filter("." + $(this).attr("name"));
});
</div>

3. 使用has()来判断一个元素是否包含特定的class或者元素

复制代码 代码如下:

//jQuery 1.4.* includes support for the has method. This method will find
//if a an element contains a certain other element class or whatever it is
//you are looking for and do anything you want to them.
$("input").has(".email").addClass("email_icon");

4. 使用jQuery切换样式

复制代码 代码如下:

//Look for the media-type you wish to switch then set the href to your new style sheet
$('link[media='screen']').attr('href', 'Alternative.css');

5. 限制选择的区域

复制代码 代码如下:

//Where possible, pre-fix your class names with a tag name
//so that jQuery doesn't have to spend more time searching
//for the element you're after. Also remember that anything
//you can do to be more specific about where the element is
//on your page will cut down on execution/search times
var in_stock = $('#shopping_cart_items input.is_in_stock');
<ul>
<li> <input value="Item-X" type="radio"> Item X</li>
<li> <input value="Item-Y" type="radio"> Item Y</li>
<li> <input value="Item-Z" type="radio"> Item Z</li>
</ul>

6. 如何正确使用ToggleClass

复制代码 代码如下:

//Toggle class allows you to add or remove a class
//from an element depending on the presence of that
//class. Where some developers would use:
a.hasClass('blueButton') ? a.removeClass('blueButton') : a.addClass('blueButton');
//toggleClass allows you to easily do this usinga.toggleClass('blueButton');

7. 设置IE指定的功能

复制代码 代码如下:

if ($.browser.msie) {
// Internet Explorer is a sadist.
}

8. 使用jQuery来替换一个元素

复制代码 代码如下:

$('#thatdiv').replaceWith('fnuh');

9. 验证一个元素是否为空

复制代码 代码如下:

if ($('#keks').html()) {
//Nothing found ;
}

10. 在无序的set中查找一个元素的索引

复制代码 代码如下:

$("ul > li").click(function () { var index = $(this).prevAll().length; });

11. 绑定一个函数到一个事件

复制代码 代码如下:

$('#foo').bind('click', function() { alert('User clicked on "foo."'); });

12. 添加HTML到一个元素

复制代码 代码如下:

$('#lal').append('sometext');

13. 创建元素时使用对象来定义属性

复制代码 代码如下:

var e = $("", { href: "#", class: "a-class another-class", title: "..." });

14. 使用过滤器过滤多属性

复制代码 代码如下:

//This precision-based approached can be useful when you use
//lots of similar input elements which have different types
var elements = $('#someid input[type=sometype][value=somevalue]').get();

15. 使用jQuery预加载图片

复制代码 代码如下:

jQuery.preloadImages = function() { for(var i = 0; i').attr('src', arguments[i]); } };
// Usage $.preloadImages('image1.gif', '/path/to/image2.png', 'some/image3.jpg');

16. 设置任何匹配一个选择器的事件处理程序
[code]$('button.someClass').live('click', someFunction);
//Note that in jQuery 1.4.2, the delegate and undelegate options have been
//introduced to replace live as they offer better support for context
//For example, in terms of a table where before you would use..
//
.live() $("table").each(function(){ $("td", this).live("hover", function(){ $(this).toggleClass("hover"); }); });
//Now use..
$("table").delegate("td", "hover", function(){ $(this).toggleClass("hover"); });

17. 找到被选择到的选项(option)元素

复制代码 代码如下:

$('#someElement').find('option:selected');

18. 隐藏包含特定值的元素

复制代码 代码如下:

$("p.value:contains('thetextvalue')").hide();

19. 自动的滚动到页面特定区域

复制代码 代码如下:

jQuery.fn.autoscroll = function(selector) { $('html,body').animate( {scrollTop: $(selector).offset().top}, 500 ); }
//Then to scroll to the class/area you wish to get to like this:
$('.area_name').autoscroll();

20. 检测各种浏览器

复制代码 代码如下: