使用的基础库：2.14

wxml为

<map name="dongshan" longitude="117.431" latitude="23.7144" style="height:100%;width:100%"></map>

JS为：

this.dongshanmap = wx.createMapContext('dongshan')
    this.dongshanmap.addGroundOverlay({
      id:1,
      src:'/image/2.png',
      visible:true,
      bounds:{
        southwest:{
          longitude:117.2841,
          latitude:23.5565
        },
        zIndex:100,
        opacity:1,
        northeast:{
          longitude:117.56,
          latitude:23.7726
        }
      },
      success(e){
        console.log('dia')
      },
      fail(e){
        console.log('失败')
      }

    })

最终不显示