// import _url from 'url';

let tempAnchor;

/**
 * 
 * 暂时只判断base64不跨域，否则加跨域属性
 * Sets the `crossOrigin` property for this resource based on if the url
 * for this resource is cross-origin. If crossOrigin was manually set, this
 * function does nothing.
 * Nipped from the resource loader!
 *
 * @ignore
 * @param {string} url - The url to test.
 * @param {object} [loc=window.location] - The location object to test against.
 * @return {string} The crossOrigin value to use (or empty string for none).
 */
export default function determineCrossOrigin(url: string, loc: any = window.location): string {
    // data: and javascript: urls are considered same-origin
    if (url.indexOf('data:') === 0) {
        return '';
    }

    return 'anonymous';

    // if (!tempAnchor)
    // {
    //     tempAnchor = document.createElement('a');
    // }

    // // let the browser determine the full href for the url of this resource and then
    // // parse with the node url lib, we can't use the properties of the anchor element
    // // because they don't work in IE9 :(
    // tempAnchor.href = url;
    // url = _url.parse(tempAnchor.href);

    // const samePort = (!url.port && loc.port === '') || (url.port === loc.port);

    // // if cross origin
    // if (url.hostname !== loc.hostname || !samePort || url.protocol !== loc.protocol)
    // {
    //     return 'anonymous';
    // }

    // return '';
}
