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Co-authored-by: maoxiaoke <thebigyellowbee@qq.com> resolve #4
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校对认领 |
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校对认领 @leviding |
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reviewed
Apr 22, 2018
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| ```js run | ||
| let admin, name; // can declare two variables at once | ||
| let admin, name; // 一次定义两个变量。 |
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定义 =》 声明
declare 一般翻译为声明，下同
| 4. Show the value of `admin` using `alert` (must output "John"). | ||
| 1. 定义两个变量：`admin` 和 `name`。 | ||
| 2. 将值 `"John"` 赋给 `name`。 | ||
| 3. 从 `name` 变量中拷贝其值给 `admin`。 |
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也可以这样翻译 ： 将 name 的变量值拷贝给 admin
| ``` | ||
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| Again, we could shorten that to `userName` if we know for sure that the user is current. | ||
| 再一次，如果我们的确直到用户就是当前的用户的话，我们可以使用更短的 `userName`。 |
| 再一次，如果我们的确直到用户就是当前的用户的话，我们可以使用更短的 `userName`。 | ||
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| Modern editors and autocomplete make long variable names easy to write. Don't save on them. A name with 3 words in it is fine. | ||
| 现代编辑器可自动补全可以让长变量名变得容易书写。不要节省它们。一个名字中包含三个词就挺好的。 |
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第一个 可 =》的
不要节省它们 =》 不要浪费这个特性。 感觉更好些。
Author
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@allenlongbaobao 不要忘了来校对啊 |
Signed-off-by: sqrtthree <imsqrtthree@gmail.com>
leviding
reviewed
Apr 23, 2018
| ``` | ||
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| Now we can put some data into it by using the assignment operator `=`: | ||
| 现在，通过赋值操作符 `=` 为变量添加一些数据。 |
| ``` | ||
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| ...Or even in the "comma-first" style: | ||
| ...甚至使用 “逗号优先” 的形式： |
| 有一长串的保留字无法用作变量命名，因为它们被语言本身采用了。 | ||
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| For example, words `let`, `class`, `return`, `function` are reserved. | ||
| 比如，单词 `let`， `class`， `return`， `function` 被保留。 |
| ``` | ||
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| Variables declared using `const` are called "constants". They cannot be changed. An attempt to do it would cause an error: | ||
| 使用 `const` 声明的变量称为 “常量”。它们不能被修改，尝试这样做就会造成错误： |
| `pageLoadTime` 的值在页面加载之前是未知的，所以采用常规命名。但是它仍然是个常量，因为赋值之后不会改变。 | ||
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| In other words, capital-named constants are only used as aliases for "hard-coded" values. | ||
| 换句话说，大写命名的常量仅用作 “硬编码” 值的别名。 |
| - `let` -- is a modern variable declaration. The code must be in strict mode to use `let` in Chrome (V8). | ||
| - `var` -- is an old-school variable declaration. Normally we don't use it at all, but we'll cover subtle differences from `let` in the chapter <info:var>, just in case you need them. | ||
| - `const` -- is like `let`, but the value of the variable can't be changed. | ||
| - `let` -- 新时代的变量声明方式。Chrome（V8） 中代码必须开启严格模式以使用 `let` 。 |
| - `let` -- is a modern variable declaration. The code must be in strict mode to use `let` in Chrome (V8). | ||
| - `var` -- is an old-school variable declaration. Normally we don't use it at all, but we'll cover subtle differences from `let` in the chapter <info:var>, just in case you need them. | ||
| - `const` -- is like `let`, but the value of the variable can't be changed. | ||
| - `let` -- 新时代的变量声明方式。Chrome（V8） 中代码必须开启严格模式以使用 `let` 。 |
| - `const` -- is like `let`, but the value of the variable can't be changed. | ||
| - `let` -- 新时代的变量声明方式。Chrome（V8） 中代码必须开启严格模式以使用 `let` 。 | ||
| - `var` -- 旧时代的变量声明方式。一般情况下，我们不会使用它。但是，我们会在 <info:var> 章节介绍 `var` 和 `let` 的微妙差别，以防你需要它们。 | ||
| - `const` -- 类似于`let`, 但是变量的值无法被修改。 |
Signed-off-by: sqrtthree <imsqrtthree@gmail.com>
Author
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@leviding Sorry, 之前转移文章的时候光顾着对内容，忽略排版了。现在已经调好了。 |
leviding
approved these changes
Apr 23, 2018
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Co-authored-by: maoxiaoke thebigyellowbee@qq.com
Cc @maoxiaoke
resolve #4