了解一下createObjectUrl

全局咋了，微信就是推薦你用全局的啊

大概意思是這樣的

export default function getAMap() {
  var isLoaded = true
  return new Promise(function (resolve, reject) {
    if (isLoaded) {
      window.AMap.plugin(['AMap.MouseTool', 'AMap.PolyEditor'], () => {
        resolve(window.AMap)
      })
      return
    }
    
    var script = document.createElement('script')
    script.type = 'text/javascript'
    script.async = true
    script.src = 'http://webapi.amap.com/maps?v=1.4.3&key=key&callback=$$$maptcinit&plugin=AMap.MouseTool'
    // script.onload = resolve
    script.onerror = reject
    script.onload = function () {
      isLoaded = true
      resolve(window.AMap)
    }
    document.head.appendChild(script)
  })
}