封装ajax
如果你了解了js面向对象，HTTP协议，那么就自己动手写一个AJAX框架就可以了。小技术，大家不要笑啊！
源码：（注释就不写了，应该不难看懂的）
var ajax = {
_params: null,
_callback: null,
_xhr: null,
_createXHR: function () {
if (window.ActiveXObject) {
_xhr = new ActiveXObject("Microsoft.XMLHTTP"); //IE
}
else if (window.XMLHttpRequest) {
_xhr = new XMLHttpRequest(); //FireFox,Chrome et.
}
},
_ajaxcallback: function () {
if (_xhr.readyState == 4) {
if (_xhr.status == 200) {
_callback.call(this, _xhr.responseText)
}
}
},
_changeParams: function () {
var args = arguments[0];
var s = "";
for (var i in args) {
s += "&" + i + "=" + args[i];
}
_params = s;
},
get: function (url, params, callback) {
_callback = callback;
ajax._createXHR();
ajax._changeParams(params);
if (null != _xhr) {
_xhr.open('get', url + '?' + _params, true);
_xhr.onreadystatechange = ajax._ajaxcallback;
_xhr.send();
}
},
post: function (url, params, callback) {
_callback = callback;
ajax._createXHR();
ajax._changeParams(params);
if (null != _xhr) {
_xhr.open('post', url, true);
_xhr.onreadystatechange = ajax._ajaxcallback;
_xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
_xhr.send(_params);
}
}
}
使用就很简单了。
1.先插入引用。
<script src="js/ajax.js" type="text/javascript"></script>
2.然后写 js代码：(ajaxtest.htm)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="js/ajax.js" type="text/javascript"></script>
<script type="text/javascript">
function ajaxtest() {
var uid = document.getElementByIdx_x("txtuid").value;
var pwd = document.getElementByIdx_x("txtpwd").value;
ajax.get("ajaxtest.ashx", { "uid": uid, "pwd": pwd }, function (data) {
alert(data);
});
}
</script>
</head>
<body>
<input type="text" id="txtuid" />
<input type="text" id="txtpwd" onblur="ajaxtest()"/>
</body>
</html>
3.用C#建一个一般处理程序：(ajaxtest.ashx)
<%@ WebHandler Language="C#" class="ajaxtest" %>
using System;
using System.Web;
public class ajaxtest : IHttpHandler {
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
var uid = context.Request["uid"];
var pwd = context.Request["pwd"];
context.Response.Write( uid +":" +pwd);
}
public bool IsReusable {
get {
return false;
}
}
}
这里的框架使用就和JQuery里一样，不过要注意参数的顺序：
ajax.get(
