/*

*@param startColor 开始颜色

* @param endColor 结束颜色

* @steps 步数

* @return colorList 结果颜色列表

*/

function calcLinearColor(start, end, steps) {

      const colorList = [];

      let startR = parseInt(start.slice(1, 3), 16);

      let endR = parseInt(end.slice(1, 3), 16) - startR;

      let startG = parseInt(start.slice(3, 5), 16);

      let endG = parseInt(end.slice(3, 5), 16) - startG;

      let startB = parseInt(start.slice(5, 7), 16);

      let endB = parseInt(end.slice(5, 7), 16) - startB;

      for(var i = 0; i < steps; i++) {

        let r = Math.round(startR + (endR / steps * i));

        let g = Math.round(startG + (endG / steps * i));

        let b = Math.round(startB + (endB / steps * i));

        r = r.toString(16).padStart(2, '0').toUpperCase();

        g = g.toString(16).padStart(2, '0').toUpperCase();

        b = b.toString(16).padStart(2, '0').toUpperCase();

        colorList.push(`#${r.toString(16)}${g.toString(16)}${b.toString(16)}`);

      }

      return colorList;

    }