题解 | #文件扩展名#
文件扩展名
http://www.nowcoder.com/practice/01ca4c6aa14249c2911f89baba9dc023
const _getExFilename = (filename) => {
let filenameArr = filename.split(".");
return "." + filenameArr[filenameArr.length - 1];
}
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