题解 | #文件扩展名#
文件扩展名
http://www.nowcoder.com/practice/01ca4c6aa14249c2911f89baba9dc023
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<script>
const _getExFilename = (filename) => {
// 补全代码
let lastindex=filename.lastIndexOf('.')
return filename.slice(0,lastindex) && lastindex !== -1 ? filename.slice(lastindex):''
}
</script>
</body>
</html>
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