请问这段代码中exports、module是什么意思？this, (function

Question

(function (global, factory) {

    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :

        typeof define === 'function' && define.amd ? define(['exports'], factory) :

            (factory((global.echarts = {})));

}(this, (function (exports) {

    'use strict';

// (1) The code `if (__DEV__) ...` can be removed by build tool.

// (2) If intend to use `__DEV__`, this module should be imported. Use a global

// variable `__DEV__` may cause that miss the declaration (see #6535), or the

// declaration is behind of the using position (for example in `Model.extent`,

// And tools like rollup can not analysis the dependency if not import).

    var dev;

// In browser

    if (typeof window !== 'undefined') {`请输入代码`

        dev = window.__DEV__;

    }

// In node

    else if (typeof global !== 'undefined') {

        dev = global.__DEV__;

    }

    if (typeof dev === 'undefined') {

        dev = true;

    }

    var __DEV__ = dev;

}

Answer 1

umd兼容处理。可以看umd部分