导入ECMAScript 6时“Uncaught SyntaxError: Cannot use import statement outside a module”

我正在使用ArcGIS JSAPI 4.12，希望使用空间幻象在地图上绘制军事符号。

当我将milsymbol.js添加到脚本中时，控制台返回错误

无法在模块外部使用import语句

所以我添加type="module"到脚本中，然后它返回

Uncaught ReferenceError: ms未定义

这是我的代码:

<link rel="stylesheet" href="https://js.arcgis.com/4.12/esri/css/main.css">
<script src="https://js.arcgis.com/4.12/"></script>
<script type="module" src="milsymbol-2.0.0/src/milsymbol.js"></script>

<script>
    require([
        "esri/Map",
        "esri/views/MapView",
        "esri/layers/MapImageLayer",
        "esri/layers/FeatureLayer"
    ], function (Map, MapView, MapImageLayer, FeatureLayer) {

        var symbol = new ms.Symbol("SFG-UCI----D", { size: 30 }).asCanvas(3);
        var map = new Map({
            basemap: "topo-vector"
        });

        var view = new MapView({
            container: "viewDiv",
            map: map,
            center: [121, 23],
            zoom: 7
        });
    });
</script>

所以，无论我是否添加type="module"，总会有错误。但是在Spatial Illusions的官方文档中，脚本中没有type="module"。我现在真的很困惑。他们如何在不添加类型的情况下让它工作呢?

文件milsymbol.js

import { ms } from "./ms.js";

import Symbol from "./ms/symbol.js";
ms.Symbol = Symbol;

export { ms };

当前回答

对我来说，这是由于没有引用一个库(特别是typeORM，使用ormconfig.js文件，在实体键下)到src文件夹，而不是dist文件夹…

   "entities": [
      "src/db/entity/**/*.ts", // Pay attention to "src" and "ts" (this is wrong)
   ],

而不是

   "entities": [
      "dist/db/entity/**/*.js", // Pay attention to "dist" and "js" (this is the correct way)
   ],

2020-09-14 09:46:35

其他回答

在你的包中添加"type": "module"。json文件。

并重新启动应用程序:

npm开始

那么你的问题就解决了。

2021-09-07 04:39:52

错误的原因如下:

You're currently loading the source file in the src directory instead of the built file in the dist directory (you can see what the intended distributed file is here). This means that you're using the native source code in an unaltered/unbundled state, leading to the following error: Uncaught SyntaxError: Cannot use import statement outside a module. This should be fixed by using the bundled version since the package is using rollup to create a bundle. The reason you're getting the Uncaught ReferenceError: ms is not defined error is because modules are scoped, and since you're loading the library using native modules, ms is not in the global scope and is therefore not accessible in the following script tag.

看起来你应该能够加载这个文件的dist版本，在窗口上定义ms。请查看库作者提供的这个示例，以了解如何做到这一点。

2019-10-03 04:31:03

如果您想对模块使用import而不是require()，请更改或添加package中的type值到module。json文件

例子:

包中。json文件

{
  "name": "appsample",
  "version": "1.0.0",
  "type": "module",
  "description": "Learning Node",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Chikeluba Anusionwu",
  "license": "ISC"
}

import http from 'http';

var host = '127.0.0.1',
    port = 1992,
    server = http.createServer();

server.on('request', (req, res) => {
  res.writeHead(200, {"Content-Type": "text/plain"});
  res.end("I am using type module in package.json file in this application.");
});

server.listen(port, () => console.log(
    'Listening to server ${port}. Connection has been established.'));

2021-09-09 16:28:48

我只是添加了"type": "module"到我的包。Json文件，它为我工作。

2021-12-17 11:19:48

我正在编写香草JavaScript。如果你做同样的事情，只需添加一个type="module"到你的脚本标签。

也就是之前的代码:

<script src="./index.js"></script>

更新后的代码:

<script type="module" src="./index.js"></script>`

2021-04-06 21:10:42

导入ECMAScript 6时“Uncaught SyntaxError: Cannot use import statement outside a module”

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