text: /**
   * 求两个颜色之间的渐变值
   * @param {string} startColor 开始的颜色
   * @param {string} endColor 结束的颜色
   * @param {number} step 颜色等分的份额
   * */
  function colorGradient(startColor = 'rgb(0, 0, 0)', endColor = 'rgb(255, 255, 255)', step = 10) {
    let startRGB = hexToRgb(startColor, false); //转换为rgb数组模式
    let startR = startRGB[0];
    let startG = startRGB[1];
    let startB = startRGB[2];
  
    let endRGB = hexToRgb(endColor, false);
    let endR = endRGB[0];
    let endG = endRGB[1];
    let endB = endRGB[2];
  
    let sR = (endR - startR) / step; //总差值
    let sG = (endG - startG) / step;
    let sB = (endB - startB) / step;
    let colorArr = [];
    for (let i = 0; i < step; i++) {
      //计算每一步的hex值
      let hex = rgbToHex(
        'rgb(' + Math.round(sR * i + startR) + ',' + Math.round(sG * i + startG) + ',' + Math.round(sB * i + startB) + ')'
      );
      colorArr.push(hex);
    }
    return colorArr;
  }
  
  // 将hex表示方式转换为rgb表示方式(这里返回rgb数组模式)
  function hexToRgb(sColor, str = true) {
    let reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
    sColor = sColor.toLowerCase();
    if (sColor && reg.test(sColor)) {
      if (sColor.length === 4) {
        let sColorNew = '#';
        for (let i = 1; i < 4; i += 1) {
          sColorNew += sColor.slice(i, i + 1).concat(sColor.slice(i, i + 1));
        }
        sColor = sColorNew;
      }
      //处理六位的颜色值
      let sColorChange = [];
      for (let i = 1; i < 7; i += 2) {
        sColorChange.push(parseInt('0x' + sColor.slice(i, i + 2)));
      }
      if (!str) {
        return sColorChange;
      } else {
        return `rgb(${sColorChange[0]},${sColorChange[1]},${sColorChange[2]})`;
      }
    } else if (/^(rgb|RGB)/.test(sColor)) {
      let arr = sColor.replace(/(?:\(|\)|rgb|RGB)*/g, '').split(',');
      return arr.map(val => Number(val));
    } else {
      return sColor;
    }
  }
  
  // 将rgb表示方式转换为hex表示方式
  function rgbToHex(rgb) {
    let _this = rgb;
    let reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
    if (/^(rgb|RGB)/.test(_this)) {
      let aColor = _this.replace(/(?:\(|\)|rgb|RGB)*/g, '').split(',');
      let strHex = '#';
      for (let i = 0; i < aColor.length; i++) {
        let hex = Number(aColor[i]).toString(16);
        hex = String(hex).length == 1 ? 0 + '' + hex : hex; // 保证每个rgb的值为2位
        if (hex === '0') {
          hex += hex;
        }
        strHex += hex;
      }
      if (strHex.length !== 7) {
        strHex = _this;
      }
      return strHex;
    } else if (reg.test(_this)) {
      let aNum = _this.replace(/#/, '').split('');
      if (aNum.length === 6) {
        return _this;
      } else if (aNum.length === 3) {
        let numHex = '#';
        for (let i = 0; i < aNum.length; i += 1) {
          numHex += aNum[i] + aNum[i];
        }
        return numHex;
      }
    } else {
      return _this;
    }
  }
  
  /**
   * JS颜色十六进制转换为rgb或rgba,返回的格式为 rgba（255，255，255，0.5）字符串
   * sHex为传入的十六进制的色值
   * alpha为rgba的透明度
   */
  function colorToRgba(color, alpha = 0.3) {
    color = rgbToHex(color);
    // 十六进制颜色值的正则表达式
    var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
    /* 16进制颜色转为RGB格式 */
    let sColor = color.toLowerCase();
    if (sColor && reg.test(sColor)) {
      if (sColor.length === 4) {
        var sColorNew = '#';
        for (let 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 (let i = 1; i < 7; i += 2) {
        sColorChange.push(parseInt('0x' + sColor.slice(i, i + 2)));
      }
      return 'rgba(' + sColorChange.join(',') + ',' + alpha + ')';
    } else {
      return sColor;
    }
  }
  
  export default {
    colorGradient,
    hexToRgb,
    rgbToHex,
    colorToRgba
  };
  