Ajax极大地改善了用户体验，对于web2.0来说必不可少，是前端开发人员必不可少的技能。
这个例子是这样的，当从select下拉框选择编程语言时时，根据选项的不同，异步请求不同的函数API描述。这种功能在现在web应用程序中是及其常见的。
我们先来看一下$.get()的结构
代码如下:
$.get(url, [, data], [, callback] [, type])
//url：请求的HTML页的URL地址；
//data（可选),发送至服务器的key/value数据作为QueryString附加到请求URL中；
//callback(可选):载入成功时的回调函数（只有当Response的返回状态是success才调用该方法；
//type（可选):服务器端返回内容格式，包括xml，html，script，json，text和_default
首先创建examplDB数据库，建立language和functions表，SQL如下
代码如下:
CREATE TABLE IF NOT EXISTS language (
id int(3) NOT NULL AUTO_INCREMENT,
languageName varchar(50) NOT NULL,
PRIMARY KEY (id));
CREATE TABLE IF NOT EXISTS functions (
id int(3) NOT NULL AUTO_INCREMENT,
languageId int(11) NOT NULL,
functionName varchar(64) NOT NULL,
summary varchar(128) NOT NULL, //功能概述
example text NOT NULL, //举例
PRIMARY KEY (id));
下面是插入数据的SQL
代码如下:
INSERT INTO language (id, languageName) VALUES
(1, 'PHP'),
(2, 'jQuery');
INSERT INTO functions (id, languageId, functionName, summary, example) VALUES
(1, 1, 'simplexml_load_file', 'Interprets an XML file into an object ', '$xml = simplexml_load_file(''test.xml'');/r/nprint_r($xml);/r/n'),
(2, 1, 'array_push', 'Push one or more elements onto the end of array', '$arrPets = array(''Dog'', ''Cat'', ''Fish'' );/r/narray_push($arrPets, ''Bird'', ''Rat'');/r/n'),
(3, 1, 'ucfirst', 'Make a string''s first character uppercase', '$message = ''have a nice day;/r/n$message = ucfirst($message); // output: Have A Nice Day/r/n'),
(4, 1, 'mail', 'used to send email', '$message = "Example message for mail";/r/nif(mail(''test@test.com'', ''Test Subject'', $message))/r/n{/r/n echo ''Mail sent'';/r/n}/r/nelse/r/n{/r/n echo ''Sending of mail failed'';/r/n}/r/n'),
(5, 2, '$.get', 'Load data from the server using a HTTP GET request.', '$.ajax({/r/n url: url,/r/n data: data,/r/n success: success,/r/n dataType: dataType/r/n});/r/n'),
(6, 2, 'hover', 'hover method accepts 2 functions as parameters which execute alternativelt when mouse enters and leaves an element.', '$(selector).hover(/r/nfunction()/r/n{/r/n//executes on mouseenter/r/n},/r/nfunction()/r/n{/r/n//executes on mouseleave/r/n});'),
(7, 2, 'bind', 'Attach a handler to an event for the elements.', '$(element).bind(''click'', function() /r/n{/r/n alert(''click happened'');/r/n});/r/n'),
(8, 2, 'jQuery.data', 'Store arbitrary data associated with the specified element.', 'jQuery.data(element, key, value);'),
(9, 1, 'add class', 'Adds a class', '(''p'').addClass(''myClass yourClass'');');
