terminal color设置

import (
  "github.com/fatih/color"
)
var (
    red        = color.New(color.FgRed)
    green      = color.New(color.FgGreen)
    yellow     = color.New(color.FgYellow)
    cyan       = color.New(color.FgCyan)
    blue       = color.New(color.FgBlue)
    magenta    = color.New(color.FgMagenta)
    white      = color.New(color.FgWhite)
    BoldRed    = red.Add(color.Bold)
    boldGreen  = green.Add(color.Bold)
    BoldYellow = yellow.Add(color.Bold)
    BoldMagenta= magenta.Add(color.Bold)
    BoldBlue   = blue.Add(color.Bold)
    BoldCyan   = cyan.Add(color.Bold)
    BoldWhite  = white.Add(color.Bold)
)

使用时，建议封装到 utils 下