Ajax XMLHttpRequest 异步请求
ajax异步请求即XMLHttpRequest请求：兼容firefox,mozillar,safari,opera,IE等主流浏览器
以get请求为例子：
var xmlHttp;
var bgArgument;
var responseFunction;
/**
* url:request path
* argName: argument name
* argName: argument value
*/
function httpRequest(url,argName,argValue){
if(window.XMLHttpRequest){
//support firfox, mozillar,safari,opera,IE7 later version
try{
xmlHttp = new XMLHttpRequest();
//mozillar bug
if(xmlHttp.overrideMimeType){
xmlHttp.overrideMimeType("text/xml");
}
}catch(e){
alert('do not support '+e);
}
}else if(window.ActiveXObject){
//support IE6 previous version
var activexName = ["Msxml2.XMLHTTP","Microsoft.XMLHTTP"];
for(var i=0; i<activexName.length; i++){
try{
xmlHttp = new ActiveXObject(activexName);
break;
}catch(e){
alert('do not support IE '+e);
}
}
}
if(!xmlHttp){
alert('create XMLHttpRequest failed');
return;
}
//regist callback function
xmlHttp.onreadystatechange = callback;
xmlHttp.open("GET",url+"?"+argName+"="+argValue,true);
xmlHttp.send(null);
}
//callback
function callback(){
//request server success
if(xmlHttp.readyState == 4){
//response success
if(xmlHttp.status == 200){
var result = xmlHttp.responseText;
//handler response result
}else{
alert("response failed");
}
}
}
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