Are the values ​​output by the es6 module copied?

No, the ES6 module outputs a reference to the value, while the CommonJS module outputs a copy of the value. In the ES6 module, when the JS engine statically analyzes the script and encounters the module loading command import, it will generate a read-only reference; when the script is actually executed, it will go to the loaded module based on this read-only reference. Take value. ES6 modules are dynamic references. ES6 modules do not cache running results, but dynamically obtain values ​​from the loaded module, and variables are always bound to the module in which they are located.

Browser loading

By default, the browser

loads JavaScript scripts synchronously, that is, when the rendering engine encounters It will stop when it reaches the

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