关于前端:arcgis-for-js渲染mapserver自动生成图例

传入一个mapserver的图层，该图层在公布时曾经定义了图例！！！！！

前端代码

<!-- 图例列表--><div id="legend-wrapper">      <div id="legend-box"></div></div>

此处须要留神的时每次渲染不同mapserver生成图例须要革除上一次的图例，提前先removeChild再appendChild很实用！！！！

async createLegend(layer) {      let that = this;      if (layer) {          let Legend = await arcgisPackage.Legend;          let legendBox = document.getElementById("legend-box");          let legendWrapper = document.getElementById("legend-wrapper");          legendWrapper.removeChild(legendBox)          var elem=document.createElement('div');          elem.setAttribute('id','legend-box');          legendWrapper.appendChild(elem)          legendBox = document.getElementById("legend-box");          let legend = new Legend({          view: this.view,          layerInfos: [              {              layer: layer,              title: "图例",              },          ],          container: legendBox,          });                    that.view.ui.add(legend, "top-left");          legendWrapper.appendChild(legendBox);          console.log(legend,legendBox);      }    },