十进制色值转十六进制

Posted 2020-10-15 阿席巴i

• 输入十进制数字, 默认颜色

  deciToHex(0) ==> #000000

  const deciToHex = (color, defaultColor) => {
    // 指定个非法的值不生效
    if (color && color[0] === ‘#‘) {
  return color
    }
    var c = defaultColor || ‘none‘
    color = parseInt(color)
    if (color === undefined || color > 16777215 || color < 0 || color === null) {
  return c
    }
    c = color.toString(16)
    c = leftZeroPad(c, 6)
    c = ‘#‘ + c
    return c
  }
  // 左填充
  const leftZeroPad = (val, minLength) => {
    var MANY_ZEROS = ‘000000000000000000‘
    if (typeof (val) !== ‘string‘) {
  val = String(val)
    }
    return (MANY_ZEROS.substring(0, minLength - val.length)) + val
  }