What are the two ways to export modules in node?

Two ways for node to export modules: 1. Using exports, this method can be exported by adding attributes, and multiple members can be exported; 2. Using "module.exports", this method can be exported directly through When exporting a module by assigning a value to "module.exports", only a single member can be exported.

The operating environment of this tutorial: windows10 system, nodejs version 12.19.0, Dell G3 computer.

What are the two ways for node to export a module?

There are two ways to export a module.

• exports can export multiple members

• module.exports can only export a single member, and the later ones will overwrite the previous

##1, module.exports

We can export the module directly by assigning values ​​to module.exports

module.exports can export a single member

The functions of exports can be realized by module.exports

2. exports

The exports variable is a reference to module.exports provided by node.

exports is exported by adding attributes, and only one object can be exported.

If you directly point the exports variable to a value, it will not affect module.exports, but this is equivalent to cutting off the connection between exports and module.exports.

Examples are as follows:

// 定义方法，常量
const myPI = 3.14
const add = (a,b) => a + b;
// 导出,两种方法任意都可以
// 方法一：
exports.myPI = myPI
exports.add = add
// 方法二：
module.exports.myPI = myPI
module.exports.add = add
// 方法二(变形)
module.exports  = {
    myPI,
    add
}

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