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HomeWeb Front-endFront-end Q&AAre 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.

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

## The operating environment of this tutorial: Windows 7 system, ECMAScript version 6 , Dell G3 computer.


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