先看效果

一、定义颜色选择器组件

<template>
  <el-select
    ref="colorSelect"
    placeholder=""
    v-model="myColor"
    style="width: 100%"
    @change="handleChange"
  >
    <el-option
      v-for="item in colorList"
      :key="item"
      label=" "
      :value="item"
      v-html="
        '<div class=se style=background-color:' +
        item +
        ';width:30px;border-radius:3px;display:inline-block;height:' +
        '90%' +
        '><span style=margin-left:40px;>颜色</span></div>'
      "
    >
    </el-option>
  </el-select>
</template>
<script>
export default {
  name: "colorSelect",
  //允许一个自定义组件在使用 v-model 时定制 prop 和 event。默认情况下，一个组件上的 v-model 会把 value 用作 prop 且把 input 用作 event，
  //但是一些输入类型比如单选框和复选框按钮可能想使用 value prop 来达到不同的目的。使用 model 选项可以回避这些情况产生的冲突。
  model: {
    prop: "color",
    event: "update",
  },
  props: {
    //颜色数组
    colorList: {
      type: Array,
      default: () => {
        return ["#FFC0CB", "#DB7093", "#FF1493", "#DC143C"];
      },
    },
    //父组件绑定的值
    color: {
      type: String,
      default: undefined,
    },
  },
  data() {
    return {
      myColor: undefined,
    };
  },
  methods: {
    //设置颜色选择框中颜色
    setSelectColor(color) {
      //通过操作dom节点改变样式
      this.$nextTick(() => {
        let dom = this.$refs.colorSelect;
        if (dom) {
          dom = dom.$el.children[0];
          let inputDom = dom.querySelectorAll(".el-input__inner");
          let icon = dom.querySelectorAll(".el-input__icon");
          inputDom[0].style["padding-left"] = "43px";
          icon[0].style["color"] = "black";
          //   已选择的色块
          var li = document.createElement("div");
          li.className = "sekuai";
          inputDom[0].value = "红色";
          dom.querySelectorAll(".el-input__suffix")[0].appendChild(li);
          dom.querySelectorAll(".sekuai")[0].style["background"] = color;
        }
      });
    },
    handleChange(val) {
      this.setSelectColor(val);
      //触发update事件更新父组件绑定值
      this.$emit("update", val);
    },
  },
  created() {
    if (this.color && this.color.length > 0) {
      this.myColor = this.color;
      this.setSelectColor(this.color);
    }
  },
  watch: {
    color: function (val) {
      this.setSelectColor(val);
    },
  },
};
</script>
<style scoped>
.se {
  display: inline-block;
}
</style>

这里有用到v-html：可以切换内部html元素 

v-text的话只能切换内部文字

二、引用组件并注册

import colorSelect from "../../commonview/colorSelect.vue";
	components: {
      colorSelect
    }

三、使用

<color-select :color-list="colorList" v-model="color"></color-select>

data(){
	//颜色初始数据
	colorList: ["#FFC0CB", "#DB7093", "#FF1493", "#DC143C",
		"#DDA0DD", "#DA70D6", "#FF00FF", "#9370DB",
		"#800080", "#6495ED", "#4169E1", "#0000FF",
		"#87CEEB", "#E1FFFF", "#00FFFF", "#7FFFAA",
		"#00FF7F", "#008000", "#FFFFE0", "#FFFF00",
		"#FFD700", "#F5DEB3", "#FFA500", "#CD5C5C"],
	//可设置默认值
	color:'#FFC0CB'
}