//獲取文件名，不帶后綴
var file_name=file_path.replace(/(.*/)*([^.]+).*/ig,"$2");
 
//獲取文件后綴
var FileExt=file_path.replace(/.+./,"");
 
var fileExtension = file_path.substring(file_path.lastIndexOf('.') + 1);
 
//截取文件后綴
var reg = /.w+$/;
var file_name = file_path.replace(reg,'');