创建XMLHttpRequest

最新推荐文章于 2025-09-21 18:20:03 发布

原创最新推荐文章于 2025-09-21 18:20:03 发布 · 559 阅读

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#xmlhttprequest #dojo #null #function

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var xmlHttp;

function createXMLHttpRequest(){

if (window.ActiveXObject){

xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");

}else if (window.XMLHttpRequest){

xmlHttp=new XMLHttpRequest();

}

DOJO中创建XMLHttpRequest:

d._XMLHTTP_PROGIDS = ['Msxml2.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.4.0'];
d._xhrObj= function(){
    var http = null;
    var last_e = null;
    if(!dojo.isIE || !djConfig.ieForceActiveXXhr){
        try{

http = new XMLHttpRequest();

        }catch(e){}
    }
    if(!http){
        for(var i=0; i<3; ++i){
            var progid = dojo._XMLHTTP_PROGIDS[i];
            try{
                http = new ActiveXObject(progid);
            }catch(e){
                last_e = e;
            }
            if(http){
                dojo._XMLHTTP_PROGIDS = [progid];
                break;
            }
        }
    }
    if(!http){
        throw new Error("XMLHTTP not available: "+last_e);
    }
    return http; // XMLHTTPRequest instance
}