go 根据文件的大小，加上单位值

package main

import (
	"fmt"
	"io/ioutil"
)

func FormatSize(size int64) string {
	units := [6]string{"B", "KB", "MB", "GB", "TB", "PB"}

	fsize := float64(size)
	unit := float64(1024)

	index := 0
	// fisze > 1024KB, fsize <1024B
	for fsize >= unit && index < len(units)-1 {
		fsize /= unit
		index++
	}
	return fmt.Sprintf("%.2f%s", fsize, units[index])

}

func main() {
	files, err := ioutil.ReadDir(".")
	fmt.Println(err)
	for _, file := range files {
		if file.IsDir() {
			fmt.Println("D", file.Name(), file.ModTime().Format("2006-01-02 15:03:04"))
		} else {
			//fmt.Println(file.Size())
			fmt.Println(FormatSize(file.Size()))
		}

	}
}