자바스크립트 오류를 Alert창으로 표시

//Error 잡아내기
var isDebugging = true;
function ErrorSetting(msg, file_loc, line_no) {
var e_msg=msg;
var e_file=file_loc;
var e_line=line_no;
var error_d = "Error in file: " + file_loc + "\nline number:" + line_no + "\nMessage:" + msg;
    if(isDebugging)
        alert("Error Found !!!\n--------------\n" + error_d);

    return true;
}
window.onerror = ErrorSetting;