Function indexOf

lib/request.js:197–203

(xs, x)

};

var indexOf = function (xs, x) {
    if (xs.indexOf) return xs.indexOf(x);
    for (var i = 0; i < xs.length; i++) {
        if (xs[i] === x) return i;
    }
    return -1;
};

var isXHR2Compatible = function (obj) {
    if (typeof Blob !== 'undefined' && obj instanceof Blob) return true;