使用javascript对颜色进行减淡和加深处理

template

<div style="margin-bottom: 20px;">
  <el-color-picker v-model="color"></el-color-picker>
</div>
<div style="display: flex; margin-bottom: 20px;">
  <el-input-number v-model="lightLevel" :min="0" :max="1" :precision="2" :step="0.1" style="margin-right: 10px;"
    @change="toLight"></el-input-number>
  <el-color-picker v-model="lightColor"></el-color-picker>
</div>
<div style="display: flex; margin-bottom: 20px;">
  <el-input-number v-model="darkLevel" :min="0" :max="1" :precision="2" :step="0.1" style="margin-right: 10px;"
    @change="toDark"></el-input-number>
  <el-color-picker v-model="darkColor"></el-color-picker>
</div>

Script

data() {
  return {
    lightLevel: 0,
    darkLevel: 0,
    color: '#d04a02',
    lightColor: '#d04a02',
    darkColor: '#d04a02'
  }
},
methods: {
  //hex颜色转rgb颜色
  HexToRgb(str) {
    var r = /^#?[0-9a-fA-F]{6}$/;
    //test方法检查在字符串中是否存在一个模式，如果存在则返回true，否则返回false
    if (!r.test(str)) {
      console.log("输入错误的hex")
      return
    }
    //replace替换查找的到的字符串
    str = str.replace("#", "");
    //match得到查询数组
    var hxs = str.match(/../g);
    //alert('bf:'+hxs)
    for (var i = 0; i < 3; i++) {
      hxs[i] = parseInt(hxs[i], 16);
    }
    //alert(parseInt(80, 16))
    //console.log(hxs);
    return hxs;
  },

  //GRB颜色转Hex颜色
  RgbToHex(a, b, c) {
    var r = /^\d{1,3}$/;
    if (!r.test(a) || !r.test(b) || !r.test(c)) {
      console.log("输入错误的rgb颜色值")
      return
    }
    var hexs = [a.toString(16), b.toString(16), c.toString(16)];
    for (var i = 0; i < 3; i++) {
      if (hexs[i].length === 1) hexs[i] = "0" + hexs[i];
    }
    return "#" + hexs.join("");
  },

  //得到hex颜色值为color的加深颜色值，level为加深的程度，限0-1之间
  getDarkColor(color, level) {
    var r = /^#?[0-9a-fA-F]{6}$/;
    if (!r.test(color)) {
      console.log("输入错误的hex颜色值")
      return
    };
    var rgbc = this.HexToRgb(color);
    //floor 向下取整
    for (var i = 0; i < 3; i++) {
      rgbc[i] = Math.floor(rgbc[i] * (1 - level));
    }
    return this.RgbToHex(rgbc[0], rgbc[1], rgbc[2]);
  },

  //得到hex颜色值为color的减淡颜色值，level为加深的程度，限0-1之间
  getLightColor(color, level) {
    var r = /^#?[0-9a-fA-F]{6}$/;
    if (!r.test(color)) {
      console.log("输入错误的hex颜色值")
      return
    }
    var rgbc = this.HexToRgb(color);
    for (var i = 0; i < 3; i++){
      rgbc[i] = Math.floor((255 - rgbc[i]) * level + rgbc[i]);
    }
    return this.RgbToHex(rgbc[0], rgbc[1], rgbc[2]);
  },

  toLight(val) {
    this.lightColor = this.getLightColor(this.color, val)
  },
  toDark(val) {
    this.darkColor = this.getDarkColor(this.color, val)
  }
}