XMLHttpRequest和Q

Question

我正在使用angular并且在为$ q包装XMLHttpRequest时遇到问题。

我也在使用offline.js库来检查用户是否在线。在向fav.ico发出ajax请求后，它将var'status'的状态更改为down \ up。它在调用Offline.check（）后进行ajax调用。

Offline.check（）返回我要包装到$ q的XMLHttpRequest并承诺在获取后使用结果

我试过了：

 $q( Offline.check() ).then(function(response){
    console.log(response);
 });

但得到错误：$ q：norslvr 没有解析器函数传递给$ Q

offline.js的有趣部分

   Offline.check = function() {
    Offline.trigger('checking');
    return Offline.checks['xhr']();
   };

   Offline.checks.xhr = function() {
    var e, xhr;
    xhr = new XMLHttpRequest;
    xhr.offline = false;
    xhr.open('HEAD', Offline.getOption('checks.xhr.url'), true);
    if (xhr.timeout != null) {
        xhr.timeout = Offline.getOption('checks.xhr.timeout');
    }
    checkXHR(xhr, Offline.markUp, Offline.markDown);
    try {
        xhr.send();
    } catch (_error) {
        e = _error;
        Offline.markDown();
    }
    return xhr;
};

checkXHR = function(xhr, onUp, onDown) {
    var checkStatus, _onerror, _onload, _onreadystatechange, _ontimeout;
    checkStatus = function() {
        if (xhr.status && xhr.status < 12000) {
            return onUp();
        } else {
            return onDown();
        }
    };
    if (xhr.onprogress === null) {
        _onerror = xhr.onerror;
        xhr.onerror = function() {
            onDown();
            return typeof _onerror === "function" ? _onerror.apply(null, arguments) : void 0;
        };
        _ontimeout = xhr.ontimeout;
        xhr.ontimeout = function() {
            onDown();
            return typeof _ontimeout === "function" ? _ontimeout.apply(null, arguments) : void 0;
        };
        _onload = xhr.onload;
        return xhr.onload = function() {
            checkStatus();
            return typeof _onload === "function" ? _onload.apply(null, arguments) : void 0;
        };
    } else {
        _onreadystatechange = xhr.onreadystatechange;
        return xhr.onreadystatechange = function() {
            if (xhr.readyState === 4) {
                checkStatus();
            } else if (xhr.readyState === 0) {
                onDown();
            }
            return typeof _onreadystatechange === "function" ? _onreadystatechange.apply(null, arguments) : void 0;
        };
    }
};