function GetHttpRequest() {
if (window.XMLHttpRequest) // Gecko
return new XMLHttpRequest();
else if (window.ActiveXObject) // IE
return new ActiveXObject("MsXml2.XmlHttp");
}
function AjaxPage(url,callBack) {
var oXmlHttp = GetHttpRequest();
oXmlHttp.onreadystatechange = function() {
if (oXmlHttp.readyState == 4) {
if (oXmlHttp.status == 200 || oXmlHttp.status == 304) {
document.getElementById("div_msg").innerHTML = document.getElementById("div_msg").innerHTML + ('得到js文本<br>');
createScript(oXmlHttp.responseText);
document.getElementById("div_msg").innerHTML = document.getElementById("div_msg").innerHTML + ('3秒后使用新的js<br>');
window.setTimeout(function() { callBack.call(); }, 3000);
}
else {
alert('XML request error: ' + oXmlHttp.statusText + ' (' + oXmlHttp.status + ')');
}
}
}
oXmlHttp.open('GET', url, true);
oXmlHttp.send(null);
// oXmlHttp.open('POST', "handler1.ashx", true);
// oXmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); //ajax post请求比较给头信息加上这句。否则后台context.Request.Form访问不到
// oXmlHttp.send("name=22222222222222");
}
function createScript(source) {
if ((source != null)) {
var oHead = document.getElementsByTagName('HEAD').item(0);
var oScript = document.createElement("script");
oScript.language = "javascript";
oScript.type = "text/javascript";
oScript.defer = true;
oScript.text = source;
oHead.appendChild(oScript);
}
}
window.onload = function() {
document.getElementById("div_msg").innerHTML = document.getElementById("div_msg").innerHTML + ('现在开始加载js<br>');
AjaxPage("ganttchart/base_jjl.js", function() {
document.getElementById("div_msg").innerHTML = document.getElementById("div_msg").innerHTML + ('完毕<br>');
MyAlert("test");
});
}