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