javascript - 无法设置未定义 4 的属性 'size'

Question

我刚开始使用 Node.js，但收到以下错误:

TypeError: Cannot set property 'size' of undefined at Object. (C:\Users\User\Documents\latihannode.js\javascript4\test\script 4.js:4:10) at Module._compile (internal/modules/cjs/loader.js:678:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:689:10) at Module.load (internal/modules/cjs/loader.js:589:32) at tryModuleLoad (internal/modules/cjs/loader.js:528:12) at Function.Module._load (internal/modules/cjs/loader.js:520:3) at Function.Module.runMain (internal/modules/cjs/loader.js:719:10) at startup (internal/bootstrap/node.js:228:19) at bootstrapNodeJSCore (internal/bootstrap/node.js:576:3)

在通知中，这是错误代码:

die.size = 10;

这是页面 script4.js 中的代码:

var dice = require('./dice');
var die = dice.die;

    die.size = 10;
    console.log(die.roll());
    console.log(die.roll());
    console.log(die.roll());
    console.log(die.totalRolls);

    console.log(die);

这是在页面 dice.js 中:

var die = {
  size: 6,
  totalRolls: 0,
  roll: function() {
    var result = Math.ceil(this.size * Math.random());
    this.totalRolls += 1;
    return result;
  }
};


exports.game = die;
exports.name = "My dice exports";

Answer 1

此处更改:

var dice = require('./dice');
var die = dice.game; // not die.die