纯JavaScript实现AJAX。具体代码如下：
window.lcq = {};
(function(obj) {
obj = {};
//创建xmlhttprequest对象
obj.createXMLHttpRequest = function() { if (window.ActiveXObject) { var aVersions = ["MSXML2.XMLHttp.5.0", "MSXML2.XMLHttp.4.0", "MSXML2.XMLHttp.3.0", "MSXML2.XMLHttp", "Microsoft.XMLHttp"]; for (var i = 0; i < aVersions.length; i++) { try { return new ActiveXObject(aVersions[i]); } catch (oError) { continue; } } } else if (window.XMLHttpRequest) { return new XMLHttpRequest(); } throw new Error("XMLHttp object could not be created."); }
//ajax
obj._xmlHttp = null;
obj.ajax = function(options) {
try {
obj._xmlHttp = this.createXMLHttpRequest();
obj._xmlHttp.open(options.method, options.url, true);
obj._xmlHttp.setRequestHeader("cache-control", "no-cache");
obj._xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
obj._xmlHttp.onreadystatechange = function() {
if (obj._xmlHttp.readyState == 4) {
if (obj._xmlHttp.status == 200) {
var _response = "";
switch (options.dataType.toLowerCase()) {
case "json":
_response = eval(obj._xmlHttp.responseText);
break;
case "xml":
_response = obj._xmlHttp.responseXML;
break;
case "html":
_response = obj._xmlHttp.responseText;
break;
default:
_response = obj._xmlHttp.responseText;
break;
}
options.success(_response);
}
}
else { }
}
obj._xmlHttp.send(options.data);
}
catch (e) { }
}
//提示信息的方法
obj.show = function(message) { alert(message); }
//对象引用
lcq = obj;
$ = obj;
})(lcq);
//简单的用法
function _testAjax(obj) {
obj.disabled = true;
obj.value = "正在提交......";
$.ajax({ url: "/xmls/url.xml",
method: "GET",
data: "",
dataType: "html",
success: function(response) {
obj.disabled = false;
obj.value = "处理完毕";
//show(response);
},
error: function(response) { alert(response); }
});
}
function show(message) {document.getElementById("wraper").innerHTML = message;}
//html部分
<div id="wraper" style="border: solid 1px black; height: 100px; width: 600px;">
</div>
<input type="button" value="Ajax测试" onclick="_testAjax(this);" />
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