javascript - 面向对象的 JavaScript 转换器

Question

所以我正在使用由 JavaScript 驱动的转换器应用程序，现在我正在尝试使用所有措施创建一个巨大的对象。但每当我调试它时，它都会说这样的话:

Expected ';' and instead saw '.' (var units.length = {};)
Expected '.' at column 1, not column 10 (var units.length = {};)
Unexpected '.' (var units.length = {};)
etc.

自从我用 JS 编码以来已经很长时间了，所以我对此有些困惑，希望得到任何帮助，代码如下:

var units = {};
var units.length = {};
var units.time = {};
var units.mass = {};
var units.temperature = {};

//Starting with Length
units.length.meter = 1;
units.length.meters = 1;

units.length.inch = 0.0254;
units.length.inches = 0.0254;

units.length.foot = 0.3048;
units.length.feet = 0.3048;

units.length.yard = 0.9144;
units.length.yards = 0.9144;

units.length.mile = 1609.344;
units.length.miles = 1609.344;

...

Answer 1

仅使用var声明变量，而不是创建现有对象的属性:

var units = {};
units.length = {};
units.time = {};
units.mass = {};
units.temperature = {};

//Starting with Length
units.length.meter = 1;
units.length.meters = 1;

units.length.inch = 0.0254;
units.length.inches = 0.0254;

units.length.foot = 0.3048;
units.length.feet = 0.3048;

units.length.yard = 0.9144;
units.length.yards = 0.9144;

units.length.mile = 1609.344;
units.length.miles = 1609.344;

同时考虑

var units = {
    length: {
        meter: 1,
        meters: 1,
        inch: 0.0254,
        inches: 0.0254,
        foot: 0.3048,
        feet: 0.3048,
        yard: 0.9144,
        yards: 0.9144,
        mile: 1609.344,
        miles: 1609.344
    },
    time: {},
    mass: {},
    temperature: {}
};