获取文件后缀：const fileExt = path.extname(filename); // 获取文件后缀
获取文件名称不包括后缀：filename.split(".")[0];
另外一种获取文件名称的方式，有点麻烦：
const splitFileName = function(filename) {
var pattern = /\.{1}[a-z]{1,}$/;
if (pattern.exec(filename) !== null) {
return (filename.slice(0, pattern.exec(filename).index));
} else {
return filename;
}
}
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