Detailed introduction to jQuery's ajax technology

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Detailed introduction to jQuery's ajax technology_jquery

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May 16, 2016 pm 05:32 PM

ajaxjquery

1：Ajax技术包含以下几点：
基于Web标准(XHTML + CSS)的展示
使用DOM进行动态显示和交互
使用XMLHttpRequest进行数据交换和相关操作
使用javascript将所有内容绑定在一起
Ajax的核心是JavaScript的XMLHttpRequest对象，它是一种支持异步请求的技术。简而言之，使用JS可以控制XMLHttpRequest对象向服务器提出请求并处理响应，
而不影响用户对页面的正常访问。对于XMLHttpRequest对象，不同的浏览器提供了不同的支持，IE是将其作为ActiveX控件集成到浏览器中的，而其他主流的浏览器直接
作为一般的JS对象来创建。

2：JS中的Ajax

XMLHttpRequest对象的属性及简要说明

名称	说明
readyState	通信的状态，当XMLHttpRequest对象把一个HTTP请求发送到服务器，到接收到服务器响应信息，整个过程将经历5种状态，该属性取值为为0-4
onreadystatechange	设置回调事件处理程序，当readyState属性的值改变时，会激发此事件
responseText	服务器返回的text/html格式的文档
responseXML	服务器返回的text/xml格式的文档
status	描述了HTTP响应short类型的状态代码，100表示Continue, 101表示Switching protocols数据交换，200表示执行正常，404表示未找到页面，500表示内部程序错误
statusText	HTTP响应的状态代码对应的文本(OK, not found)

readyState属性代码

代码	说明
0	代表未初始化的状态。创建了一个XMLHttpRequest对象，尚未初始化
1	代表连接状态，已经调用了open方法，并且已经准备好发送请求
2	代表发送状态，已经调用了send方法发出请求，尚未得到响应结果
3	代表正在接收状态，已经接收了HTTP响应的头部信息，正在接收响应内容
4	代表已加载状态，此时响应内容已完全被接收

复制代码代码如下:

Ajax

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