ajax.js

着重用css实现页面显示功能,实现简单数据库连接,是很好的入门教程

var ajaxHttpRequest = false;
var ajaxHttpRequestset = false;

function ajaxInit() {
	if(window.XMLHttpRequest) { //Mozilla, Opera, ...
		ajaxHttpRequest = new XMLHttpRequest();
		if(ajaxHttpRequest.overrideMimeType) {
			ajaxHttpRequest.overrideMimeType("text/xml");
		}
	}
	else if(window.ActiveXObject) { //IE
		try{
			ajaxHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e) {
			try{
				ajaxHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e) {
			}
		}
	}
	if(!ajaxHttpRequest) {
		window.alert("不能创建XMLHttpRequest对象实例");
		return false;
	}
}
function ajaxInitset() {
	if(window.XMLHttpRequest) { //Mozilla, Opera, ...
		ajaxHttpRequestset = new XMLHttpRequest();
		if(ajaxHttpRequestset.overrideMimeType) {
			ajaxHttpRequestset.overrideMimeType("text/xml");
		}
	}
	else if(window.ActiveXObject) { //IE
		try{
			ajaxHttpRequestset = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e) {
			try{
				ajaxHttpRequestset = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e) {
			}
		}
	}
	if(!ajaxHttpRequestset) {
		window.alert("不能创建XMLHttpRequest对象实例");
		return false;
	}
}

function ajaxSendPostset(url, values, processRequest) {
	ajaxHttpRequestset.open("POST",url,true);
	ajaxHttpRequestset.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	ajaxHttpRequestset.send(values);
	ajaxHttpRequestset.onreadystatechange = processRequest;
}
function ajaxSendPost(url, values, processRequest) {
	ajaxHttpRequest.open("POST",url,true);
	ajaxHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	ajaxHttpRequest.send(values);
	ajaxHttpRequest.onreadystatechange = processRequest;
}
ajaxInit();
ajaxInitset();//创建第个对象