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