why don’t have function by commonJS way?

原创于 2018-08-31 10:31:28 发布 · 228 阅读

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#commonJS #don't find function

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博客探讨了CommonJS方式找不到函数的问题。分析发现代码中存在误解，相关调用实际是对象属性，而调用函数是全局对象属性，会导致错误。还指出使用ES6 export可解决该问题，也给出不使用ES6语法的可行代码。

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why don’t have function by commonJS way?, have below code:

exports.add = function(a, b) {
    return a + b
}
add(2, 3) //-> ReferenceError: add is not defined

wake up, i understand the origin of problem. exports is shorthand of module.exports, so exports.add actually is module.exports.add, that is prop of Object module.exports. however call add function is a prop of global object actually.
so got a error: ReferenceError: add is not defined. use es6 export should no the problem. below code:

export const add = function(a, b) {
    return a + b
}
add(2, 3) //-> 5

// babel complier to es5

"use strict";

Object.defineProperty(exports, "__esModule", {
    value: true
});
var add = exports.add = function add(a, b) {
    return a + b;
};
add(2, 3);

so we write such code that is no problem if we want don’t to use grammar of es6:

var add = exports.add = function add(a, b) {
    return a + b;
};
add(2, 3);