Does highcharts's map data not support local import?

when using highcharts"s provincial map, the sample import downloaded from the official website is as follows (Shandong Province as an example):

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body><div id="map" style="width:800px;height: 500px;"></div>
<script src="https://img.hcharts.cn/highmaps/highmaps.js"></script>
<script src="https://data.jianshukeji.com/geochina/shandong.js"></script>
<!-- <script src="./shandong.js"></script> -->
<script>
// 
var data = [{"name":"","value":78},{"name":"","value":94},{"name":"","value":36},{"name":"","value":53},{"name":"","value":64},{"name":"","value":14},{"name":"","value":34},{"name":"","value":26},{"name":"","value":15},{"name":"","value":3},{"name":"","value":30},{"name":"","value":9},{"name":"","value":66},{"name":"","value":93},{"name":"","value":48},{"name":"","value":67},{"name":"","value":8}];
// 
var map = new Highcharts.Map("map", {
  title: {
    text: ""
  },
  colorAxis: {
    min: 0,
    minColor: "rgb(255,255,255)",
    maxColor: "-sharp006cee"
  },
  series: [{
    data: data,
    name: "",
    mapData: Highcharts.maps["cn/shandong"],
    joinBy: "name" //  name 
  }]
});
</script></body></html>

I put

<script src="https://data.jianshukeji.com/geochina/shandong.js"></script>

Change the

statement to

<script src="./shandong.js"></script> // ./shandong.jshttps://data.jianshukeji.com/geochina/shandong.js

as a result, the map data can not be displayed:

Why doesn"t the map display properly after I copy the contents of the link on the web page to the local area?