pifa/utils/color.js

/**
 * 16进制转rgb
 * @param {String} color
 * @returns {String}
 */
export const hex2rgb = (color) => {
  var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/
  var sColor = color.toLowerCase()
  if (sColor && reg.test(sColor)) {
    if (sColor.length === 4) {
      var sColorNew = "#"
      for (var i = 1; i < 4; i += 1) {
        sColorNew += sColor.slice(i, i + 1).concat(sColor.slice(i, i + 1))
      }
      sColor = sColorNew
    }
    //处理六位的颜色值
    var sColorChange = [];
    for (var i = 1; i <= 6; i += 2) {
      sColorChange.push(parseInt("0x" + sColor.slice(i, i + 2)));
    }
    return "rgba(" + sColorChange.join(",") + ")"
  } else {
    return sColor
  }
}

// rbg带透明度转16进制
export const rgb2hex = (color) => {
  var values = color
    .replace(/rgba?\(/, '')
    .replace(/\)/, '')
    .replace(/[\s+]/g, '')
    .split(',')
  var a = parseFloat(values[3] || 1),
    r = Math.floor(a * parseInt(values[0]) + (1 - a) * 255),
    g = Math.floor(a * parseInt(values[1]) + (1 - a) * 255),
    b = Math.floor(a * parseInt(values[2]) + (1 - a) * 255);
  return "#" +
    ("0" + r.toString(16)).slice(-2) +
    ("0" + g.toString(16)).slice(-2) +
    ("0" + b.toString(16)).slice(-2)
}

// 16进制转换rgb，并设置透明度
export const hex2rgba = (color, opacity) => {
  var theColor = color.toLowerCase()
  //十六进制颜色值的正则表达式
  var r = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/
  // 如果是16进制颜色
  if (theColor && r.test(theColor)) {
    if (theColor.length === 4) {
      var sColorNew = "#"
      for (var i = 1; i < 4; i += 1) {
        sColorNew += theColor.slice(i, i + 1).concat(theColor.slice(i, i + 1))
      }
      theColor = sColorNew
    }
    //处理六位的颜色值
    var sColorChange = []
    for (var i = 1; i < 7; i += 2) {
      sColorChange.push(parseInt("0x" + theColor.slice(i, i + 2)))
    }
    return "rgba(" + sColorChange.join(",") + "," + opacity + ")"
  }
  return theColor
}