获取 JavaScript 脚本自身的 URL

getCurrentScriptUrl.js

(function(window, $, jetbrick) {
    /**
     * Get the current script's URL by throwing an `Error` and analyzing it.
     *
     * @returns String or `undefined`
     * @private
     */
    var getCurrentScriptUrlFromErrorStack = function(stack) {
        var url, matches;
        if (typeof stack === "string" && stack) {
            matches = stack.match(/^(?:|[^:@]*@|.+\)@(?=http[s]?|file)|.+?\s+(?: at |@)(?:[^:\(]+ )*[\(]?)((?:http[s]?|file):\/\/[\/]?.+?\/[^:\)]*?)(?::\d+)(?::\d+)?/);
            if (matches && matches[1]) {
                url = matches[1];
            } else {
                matches = stack.match(/\)@((?:http[s]?|file):\/\/[\/]?.+?\/[^:\)]*?)(?::\d+)(?::\d+)?/);
                if (matches && matches[1]) {
                    url = matches[1];
                }
            }
        }
        return url;
    };

    /**
     * Get the current script's URL.
     *
     * @returns String or undefined
     * @private
     */
    jetbrick.getCurrentScriptUrl = function() {
        var document = window.document;
        if (document.currentScript && document.currentScript.src) {
            return document.currentScript.src;
        }

        var scripts = document.getElementsByTagName("script");
        if (scripts.length === 1) {
            return scripts[0].src || undefined;
        }
        var url;
        if ("readyState" in scripts[0]) {
            for (i = scripts.length; i--;) {
                if (scripts[i].readyState === "interactive" && (url = scripts[i].src)) {
                    return url;
                }
            }
        }
        if (document.readyState === "loading" && (url = scripts[scripts.length - 1].src)) {
            return url;
        }

        // Get the current script's URL by throwing an `Error` and analyzing it.
        try {
            throw new Error();
        } catch (e) {
            return e.sourceURL || e.fileName || getCurrentScriptUrlFromErrorStack(e.stack);
        }

        return undefined;
    };

})(window, jQuery, window.jetbrick || (window.jetbrick = {}));