openlayers的扩展有两个，一定要切记！ 分别对应不同的使用情况！
NPM packages
ol-ext exist as ES6 modules (ol-ext) and as pure js (openlayers-ext).
using ol-ext in a webpack
- For use with webpack, Rollup, Browserify, or other module bundlers, install the npm ol-ext package and link to the node_modules directory:
npm install ol-ext
See the following examples for more detail on bundling OpenLayers with your application:
using ol-ext in a web page
- For use in a web page install the npm openlayers-ext package:
npm install openlayers-ext
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