1-js/04-object-basics/01-object#143
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leviding merged 26 commits intojavascript-tutorial:zh-hansfrom Jul 22, 2018
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@leviding 校对认领 |
Tivcrmn
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Jul 3, 2018
| # 对象 | ||
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| As we know from the chapter <info:types>, there are seven language types in JavaScript. Six of them are called "primitive", because their values contain only a single thing (be it a string or a number or whatever). | ||
| 正如我们从《引言：类型》中知道的那样，JS中有很多种类型。 有六种原始类型，因为他们只包含一种东西（字符串，数值或者什么之类） |
| 相反，对象用来存储键值对和更复杂的实体。在JS中，对象深入到这门语言的方方面面。所以在我们深入理解这门语言之前，我们必须理解对象。 | ||
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| An object can be created with figure brackets `{…}` with an optional list of *properties*. A property is a "key: value" pair, where `key` is a string (also called a "property name"), and `value` can be anything. | ||
| 对象可以通过中括号`{…}`和其中包含一些可选的*属性*来创建。属性是一个键值对，键是一个字符串 （也叫做属性名）， 值可以任何的什么. |
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| An empty object ("empty cabinet") can be created using one of two syntaxes: | ||
| 我们可以额用下面的语法来创建一个空的对象（“空柜子”）： |
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『我们可以额用下面的语法来创建一个空的对象（“空柜子”）：』=>『我们可以用下面两种语法的任一种来创建一个空的对象（“空柜子”）：』
| let user = {}; // "object literal" syntax | ||
| let user = new Object(); // “构造函数” 的语法 | ||
| let user = {}; // “对象文本” 的语法 | ||
| ``` |
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| Usually, the figure brackets `{...}` are used. That declaration is called an *object literal*. | ||
| 通常，我们用中括号。这种方式我们叫做*对象文本* |
| 5. Remove the property `name` from the object. | ||
| 1. 创建一个空的`user`对象. | ||
| 2. 为这个对象增加一个属性，键是`name`值是`John`。 | ||
| 3. 在增加一个属性键`surname`值`Smith`。 |
| # 检查空对象 | ||
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| Write the function `isEmpty(obj)` which returns `true` if the object has no properties, `false` otherwise. | ||
| 写一个方法`isEmpty(obj)`，当对象没有属性的时候返回 `true`，否自返回`false`。 |
| 当然，这没什么问题。 | ||
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| The `const` only protects the variable itself from changing. | ||
| 关键字`const`保证对象本身不改变。 |
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『关键字const保证对象本身不改变。』=>『关键字const保证存储对象的变量本身不改变。』
| # 属性值求和 | ||
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| We have an object storing salaries of our team: | ||
| 我们用一个对象保存我们的工资： |
| # 数值属性都乘以2 | ||
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| Create a function `multiplyNumeric(obj)` that multiplies all numeric properties of `obj` by `2`. | ||
| 穿件一个`multiplyNumeric(obj)`方法，把`obj`所有的数值属性都乘以`2`。 |
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@MENQ 可以修改啦 |
leviding
reviewed
Jul 3, 2018
| 3. Add the property `surname` with the value `Smith`. | ||
| 4. Change the value of the `name` to `Pete`. | ||
| 5. Remove the property `name` from the object. | ||
| 1. 创建一个空的`user`对象. |
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汉字与英文还有数字之间要有空格，但是逗号和句号等全角符号（不包括破折号）前后不管是什么，都不要空格。这只是格式要求的一小点，详细请见翻译计划 WIKI 的译者教程，根据译者教程中的格式要求部分修改全文的格式。
本行空格这样加：
创建一个空的 `user` 对象
此外，句号用中文的。
| @@ -1,14 +1,14 @@ | |||
| importance: 5 | |||
| 重要级别：5 | |||
| 3. Add the property `surname` with the value `Smith`. | ||
| 4. Change the value of the `name` to `Pete`. | ||
| 5. Remove the property `name` from the object. | ||
| 1. 创建一个空的`user`对象. |
Member
There was a problem hiding this comment.
汉字与英文还有数字之间要有空格，但是逗号和句号等全角符号（不包括破折号）前后不管是什么，都不要空格。这只是格式要求的一小点，详细请见翻译计划 WIKI 的译者教程，根据译者教程中的格式要求部分修改全文的格式。
本行空格这样加：
创建一个空的 `user` 对象
此外，句号用中文的。
Contributor
Author
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@leviding OK |
Member
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@MENQ 记得修改下哈 |
Contributor
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想起来了！ |
Contributor
Author
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@leviding 可以校对！ |
leviding
approved these changes
Jul 22, 2018
Member
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@MENQ 翻译辛苦了，但是格式还是要注意下哈，看看我的这些 commit 记录 |
Member
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经读者投诉，本 PR 下的译文质量较差，有较多错误，需要重新返工，本 PR 下翻译积分取消。忘今后认真翻译，译文都是有记录可循的。 |
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#23 迟了，不好意思！