ygtx_oa/shares/resources/js/loading.js

var xmlHttp;
var url="http://www.qq.com";
function createXMLHttpRequest() { //����һ��xmlHttpRequest����
if (window.ActiveXObject) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} 
else if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
}
}

function loading(){
    createXMLHttpRequest();
    xmlHttp.onreadystatechange = handleStateChange; //����״̬�ı��¼�����handleStateChange����
    xmlHttp.open("GET",url); //����get�����ύ���
    xmlHttp.send(null); 
}

function handleStateChange(){
    var loadcontent = document.createElement("div");
    loadcontent.style.width=document.body.clientWidth;
	loadcontent.style.height=document.documentElement.clientHeight;
	loadcontent.className="loading";
	document.body.appendChild(loadcontent);
    if(xmlHttp.readystate == 4){ //��ʾ����״̬ 4Ϊ���
    if(xmlHttp.status == 200){ //http״ָ̬ʾ�룬200��ʾok
    loadcontent.style.display="none";
    }
    }
    else  loadcontent.style.display="block";//����Ӧδ��ɵĻ�������ʾloading..
}

if (document.all){
 window.attachEvent('onload',loading)//IE��,document.all�����������ж��Ƿ���ie�Ĺ���
}
else{
window.addEventListener('load',loading,false);//firefox
}