百度地图JavaScript API GL开发文档：jspopularGL | 百度地图API SDK (baidu.com)

百度地图JavaScript API GL示例中心：地图JS API示例 | 百度地图开放平台 (baidu.com)

百度地图JavaScript API GL类参考：百度地图JSAPI WebGL v1.0类参考 (bcebos.com)

实现效果：

<template>
	<div class="container ">
		<div class="row">
			<div class="col-7 rounded-box" style="padding: 0;height:830px;position:relative;overflow:hidden">
				<div id="mapcontainer" class="allmap map map-old"></div>
				<div class="map-c">
					<p>建筑面积图例 <span>单位：公顷</span></p>
					<ul class="map-c-ul1">
						<li></li>
						<li></li>
						<li></li>
						<li></li>
						<li></li>
					</ul>
					<ul class="map-c-ul2">
						<li>1-10</li>
						<li>10-20</li>
						<li>20-30</li>
						<li>20-30</li>
						<li>20-30</li>
					</ul>
				</div>
			</div>
		</div>
  </div>
</template>

<script>
import { BMPGL } from '@/plugins/bmpgl.js';
import BaiduMap from 'vue-baidu-map/components/map/Map.vue';

export default {
    
    name: '',
    props: [''],

    data() {
        return {
          center: {
              lng: 102.114129,
              lat: 37.150339,
          },
          zoom: 5,  
          proname: '北京市',
          prokind: 0,
          Pvalue:[
            {
              name:'澳门',
              value:0
            },
            {
              name:'香港',
              value:0
            },
            {
              name:'台湾省',
              value:0
            },
            {
              name:'新疆维吾尔自治区',
              value:0
            },
            {
              name:'宁夏回族自治区',
              value:0
            },
            {
              name:'青海省',
              value:0
            },
            {
              name:'甘肃省',
              value:0
            },
            {
              name:'陕西省',
              value:15
            },
            {
              name:'西藏自治区',
              value:0
            },
            {
              name:'云南省',
              value:0
            },
            
            
            {
              name:'贵州省',
              value:0
            },
            {
              name:'四川省',
              value:0
            },
            {
              name:'重庆市',
              value:0
            },
            {
              name:'海南省',
              value:0
            },
            {
              name:'广西壮族自治区',
              value:0
            },
            {
              name:'广东省',
              value:9
            },
            {
              name:'湖南省',
              value:0
            },
            {
              name:'湖北省',
              value:25
            },
            {
              name:'河南省',
              value:8
            },
            {
              name:'山东省',
              value:0
            },
            {
              name:'江西省',
              value:0
            },
            {
              name:'福建省',
              value:0
            },
            {
              name:'安徽省',
              value:0
            },
            {
              name:'浙江省',
              value:0
            },
            {
              name:'江苏省',
              value:0
            },
            {
              name:'上海市',
              value:0
            },
            {
              name:'黑龙江省',
              value:0
            },
            {
              name:'吉林省',
              value:0
            },
            {
              name:'辽宁省',
              value:0
            },
            {
              name:'内蒙古自治区',
              value:0
            },
            {
              name:'山西省',
              value:0
            },
            {
              name:'河北省',
              value:0
            },
            {
              name:'天津市',
              value:0
            },
            {
              name:'北京市',
              value:0
            },
          ],
          BMapGL:{},

          
        };
    },
    components: {
        BaiduMap,
        
    },
    created() {
        this.initMap();
    },
    // mounted(){
    //   this.initMap();
    // },
    methods: {
        initMap() {
            
            BMPGL('把这句汉字换成你申请到的百度地图ak')
                .then(BMapGL => {
                  this.BMapGL=BMapGL
                    
                    this.map = new BMapGL.Map('mapcontainer');
                    console.log(BMapGL);
                    let pointA = new BMapGL.Point(
                        this.center.lng,
                        this.center.lat
                    );
                    this.map.centerAndZoom(pointA, 5); //中心点坐标和地图级别
                    this.map.enableScrollWheelZoom(true); //滚轮缩放
                    
                    this.map.setMapType('B_NORMAL_MAP');
                   
                    this.Pvalue.forEach((e)=>{
                      let col=this.colorSelect(e.value);
                      this.addDis(e.name, col);

                    })
                    
                })
                .catch(err => {
                    console.log(err);
                });
        },
        addDis(proname,col) {
            
            let dist = new this.BMapGL.DistrictLayer({
                name: '(' + proname + ')',
                kind: 0,
                fillColor: col,
                fillOpacity: 0.9,//图层透明度，在0-1之间选择
                strokeColor: '#daeafa',
                viewport: false
            });
            this.map.addDistrictLayer(dist);
        },
        colorSelect(num){
            let col ='#5592c7'
          if (num>=1 & num<=10) {
              col ='#6fec4f'
          }else if (num>=11 & num<=20){
            col ='#5dc642'
          }else if (num>=21 & num<=30){
            col ='#4ba035'
          }else if (num>=31 & num<=40){
              col ='#397929'
          }else if (num>=41 ){
              col ='#27531c'
          }else{
              col ='#5592c7'
          }
          return col
        },
    
        
    },
    watch: {},
};
</script>
<style lang="less" scoped>
.map {
    height: 100%;
    width: 100%;
    border-radius: 20px;
}
ul li {
    list-style: none outside none;
    height: 37px;
}
.Greenbuild {
    font-size: 18px;
    left: 50px;
    font-weight: normal;
}
.Greenarea {
    right: 50px;
    font-size: 20px;
    font-weight: normal;
}
table {
    font-size: 14px;
    th {
        height: 40px;
        text-align: center;
        border-bottom: 1px solid #ddd;
        background-color: rgba(0, 0, 0, 0.02);
        font-weight: bold;
    }
    td {
        height: 40px;
        text-align: center;
        border-bottom: 1px solid #ddd;
    }
}
.map-c {
    position: absolute;
    right: 0px;
    bottom: 0px;
    background: rgba(255, 255, 255, 0.9);
    padding: 15px;
    border-top-left-radius: 15px;
    padding-bottom: 0;
    p {
        overflow: hidden;
        font-weight: 600;
        font-size: 15px;
        line-height: 20px;
        span {
            float: right;
            font-weight: 100;
            font-size: 14px;
            line-height: 20px;
        }
    }
    .map-c-ul1,
    .map-c-ul2 {
        overflow: hidden;
        li {
            width: 50px;
            float: left;
            height: 15px;
        }
    }
    .map-c-ul2 {
        li {
            height: auto;
            border-right: 1px solid #eee;
            text-align: center;
            font-size: 12px;
            &:last-child {
                border-right: none;
            }
        }
    }
    .map-c-ul1 {
        li {
            &:nth-child(1) {
                background: #6fec4f;
            }
            &:nth-child(2) {
                background: #5dc642;
            }
            &:nth-child(3) {
                background: #4ba035;
            }
            &:nth-child(4) {
                background: #397929;
            }
            &:nth-child(5) {
                background: #27531c;
            }
        }
    }
}
</style>

bmpgl.js

export function BMPGL(ak) {
  return new Promise(function (resolve, reject) {
    
      window.init = function() {
        resolve(BMapGL)
      }
      const script = document.createElement('script')
      script.type = 'text/javascript'
      script.id='mygl'
      script.src = `http://api.map.baidu.com/api?v=1.0&type=webgl&ak=${ak}&callback=init`
      script.onerror = reject
      document.head.appendChild(script)
    })
}



export default {
  BMPGL,
}

在nuxt中会出现window is not defined   的错误，但是并不影响运行，主要原因是vscode的node运行环境中使用的是global而非浏览器的window

如果非要解决，可以在bmpgl.js中使用到window的地方做一个判断：

typeof window == "undefined" ? global : window