获取当前正在执行的JavaScript代码的文件路径,以获取动态加载的跨域JavaScript文件

var fnFullFilePathToFileParentPath = function(JSFullFilePath){
    var JSFileParentPath = '';
    if(JSFullFilePath) {
        JSFileParentPath = JSFullFilePath.substring(0,JSFullFilePath.lastIndexOf('/')+1);
    } else {
        JSFileParentPath = null;
    }
    return JSFileParentPath;
};

var fnExceptionToFullFilePath = function(e){
    var JSFullFilePath = '';

    if(e.fileName) {    // firefox
        JSFullFilePath = e.fileName;
    } else if (e.stacktrace) {  // opera
        var tempStackTrace = e.stacktrace;
        tempStackTrace = tempStackTrace.substr(tempStackTrace.indexOf('http'));
        tempStackTrace = tempStackTrace.substr(0,tempStackTrace.indexOf('Dummy Exception'));
        tempStackTrace = tempStackTrace.substr(0,tempStackTrace.lastIndexOf(':'));
        JSFullFilePath = tempStackTrace;
    } else if (e.stack) {   // firefox,opera,chrome
        (function(){
            var str = e.stack;
            var tempStr = str;

            var strProtocolSeparator = '://';
            var idxProtocolSeparator = tempStr.indexOf(strProtocolSeparator)+strProtocolSeparator.length;

            var tempStr = tempStr.substr(idxProtocolSeparator);
            if(tempStr.charAt(0)=='/') {
                tempStr = tempStr.substr(1);
                idxProtocolSeparator++;
            }

            var idxHostSeparator = tempStr.indexOf('/');
            tempStr = tempStr.substr(tempStr.indexOf('/'));

            var idxFileNameEndSeparator = tempStr.indexOf(':');
            var finalStr = (str.substr(0,idxProtocolSeparator + idxHostSeparator + idxFileNameEndSeparator));
            finalStr = finalStr.substr(finalStr.indexOf('http'));
            JSFullFilePath = finalStr;
        }());
    } else {    // internet explorer
        JSFullFilePath = null;
    }

    return JSFullFilePath;
};

var fnExceptionToFileParentPath = function(e){
    return fnFullFilePathToFileParentPath(fnExceptionToFullFilePath(e));
};

var fnGetJSFileParentPath = function() {
    try {
        throw new Error('Dummy Exception');
    } catch (e) {
        return fnExceptionToFileParentPath(e);
    }
};

var JSFileParentPath = fnGetJSFileParentPath();
alert('File parent path: ' + JSFileParentPath);