1-02-11-逻辑运算符 by EmilyQiRabbit · Pull Request #55 · javascript-tutorial/zh.javascript.info

EmilyQiRabbit · 2018-04-23T06:31:06Z

翻译完成 #11

EmilyQiRabbit · 2018-04-23T06:32:13Z

@leviding 翻译完成

wavezhang · 2018-04-23T14:53:53Z

@leviding 校对认领

leviding · 2018-04-23T14:54:20Z

@wavezhang ok

wavezhang · 2018-04-23T15:05:12Z

@@ -1,13 +1,13 @@
-The answer: first `1`, then `2`.
+答案：第一个是 `1`，然后是 `2`。


这里 first... then... 翻译成 首先……然后…… 是不是更合理一点？

wavezhang · 2018-04-23T15:16:54Z

-1. The first OR `||` evaluates it's left operand `alert(1)`. That shows the first message with `1`.
-2. The `alert` returns `undefined`, so OR goes on to the second operand searching for a truthy value.
-3. The second operand `2` is truthy, so the execution is halted, `2` is returned and then shown by the outer alert.
+1. 第一个或运算 `||` 对它左边的 `alert(1)` 进行了计算。这就显示了第一条 `1` 的信息。


operand直接忽略不太好吧，可以翻译成左值

wavezhang · 2018-04-23T16:08:33Z

-2. The `alert` returns `undefined`, so OR goes on to the second operand searching for a truthy value.
-3. The second operand `2` is truthy, so the execution is halted, `2` is returned and then shown by the outer alert.
+1. 第一个或运算 `||` 对它左边的 `alert(1)` 进行了计算。这就显示了第一条 `1` 的信息。
+2. 函数 `alert` 返回了 `undefined`，所以或运算继续检查第二个参数，寻找真值。


这里operand翻译成参数不太准确，应该翻译成操作数

wavezhang · 2018-04-23T16:17:29Z

 ---

-# What is the result of AND'ed alerts?
+# 与运算和 alerts 的结果是什么？


这样会不会好点？
# 与运算连接的alerts结果是什么？

wavezhang · 2018-04-23T16:51:21Z

+在传统的编程中，逻辑或仅能够操作布尔值。如果参与运算的一个参数为 `true`，结果将返回 `true`，否则返回 `false`。

-In JavaScript the operator is a little bit more tricky and powerful. But first let's see what happens with boolean values.
+在 JavaScript 中，逻辑运算符更加灵活强大。但是首先我们来看一下参与运算的布尔值发生了什么。


但是我们首先看下操作数是布尔值的时候发生了什么。

wavezhang · 2018-04-23T17:05:20Z

+返回的值是操作数的初始形式，不会做布尔转换。

-In other words, a chain of OR `"||"` returns the first truthy value or the last one if no such value is found.
+也就是，一个或 `"||"` 运算的链将返回第一个真（布尔转化后为 true 的，译者注）值，如果这样的值不存在就返回该链的最后一个值。


这个不需要注吧？

wavezhang · 2018-04-23T17:08:31Z


-    If both `currentUser` and `defaultUser` were falsy then `"unnamed"` would be the result.
-2. **Short-circuit evaluation.**
+    如果 `currentUser` 和 `defaultUser` 都是无效值，那么结果就是 `"unnamed"`。


falsy翻译成假值好点？

wavezhang · 2018-04-23T17:11:58Z

+    操作数不仅仅可能是值，还可能是任意表达式。或运算会从左到右计算并测试每个操作数。当找到第一个真值，计算就会停止，并返回这个值。这个过程就叫做“短路取值”，因为它将从左到右的计算尽可能的少。

-    This is clearly seen when the expression given as the second argument has a side effect. Like a variable assignment.
+    当表达式作为第二个参数并且有一定副作用 - 比如变量赋值 - 的时候，这就清楚可见了。


不需要连词符吧？

wavezhang · 2018-04-23T17:16:23Z

+## &&（与）

-The AND operator is represented with two ampersands `&&`:
+两个 ＆ 符号表示 `&&` 与操作：


这个得用半角符号吧

wavezhang · 2018-04-23T17:18:57Z

+- 如果所有的操作数都被计算过（也就是，转换结果都是 `true`），返回最后一个操作数。

-In other words, AND returns the first falsy value or the last value if none were found.
+换句话说，与操作符返回第一个假值，如果没有假值就返回最后一个值。（假值：将该变量进行布尔转换后为 `false`。译者注）


是不是也不需要注

wavezhang · 2018-04-23T17:25:51Z

@EmilyQiRabbit @leviding 校对完成

leviding

不错，进步很大

leviding · 2018-04-23T22:32:01Z

@@ -1,10 +1,10 @@
-importance: 3
+重要性：3


leviding · 2018-04-23T22:32:14Z

@@ -1,10 +1,10 @@
-importance: 5
+重要性：5


leviding · 2018-04-23T22:32:30Z

@@ -1,10 +1,10 @@
-importance: 5
+重要性：5


leviding · 2018-04-23T22:33:10Z

+调用 `alert` 返回了 `undefined`（它只展示消息，所以没有有意义的返回值）。

-Because of that, `&&` evaluates the left operand (outputs `1`), and immediately stops, because `undefined` is a falsy value. And `&&` looks for a falsy value and returns it, so it's done.
+因此，`&&` 计算了它左边的操作数(显示 `1`)，然后立即停止了，因为 `undefined` 是一个假值。并且 `&&` 就是寻找假值然后返回它，所以运算结束。


显示 1 的括号用中文的

leviding · 2018-04-23T22:33:17Z

@@ -1,10 +1,10 @@
-importance: 3
+重要性：3


leviding · 2018-04-23T22:34:03Z

@@ -1,9 +1,9 @@
-importance: 3
+重要性：3


leviding · 2018-04-23T22:34:43Z

-// Doesn't run
-// -1 && 0 = 0, falsy
+// 不执行。
+// -1 && 0 = 0, 假值


逗号用全角，假值前多于一个空格

leviding · 2018-04-23T22:35:16Z

@@ -1,12 +1,12 @@
-importance: 5
+重要性：5


leviding · 2018-04-23T22:35:45Z

 ---

-# A question about "if"
+# 一个关于“if”的问题


"if" 前后需要空格，且本 Repo 中就用英文的引号吧

leviding · 2018-04-23T22:37:59Z

- Evaluate operands from left to right.
- For each operand, convert it to a boolean. If the result is `false`, stop and return the original value of that operand.
- If all other operands have been assessed (i.e. all were truthy), return the last operand.
+=- 从左到右依次计算操作数。


开头手误多打了一个等于号？

EmilyQiRabbit · 2018-04-23T23:41:15Z

@leviding 校对完成
@wavezhang 蟹蟹！

EmilyQiRabbit added 24 commits April 23, 2018 12:50

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EmilyQiRabbit changed the title ~~Translation/1-02-11-logical-operators~~ 1-02-11-逻辑运算符 Apr 23, 2018

leviding added the 校对认领 label Apr 23, 2018

leviding mentioned this pull request Apr 23, 2018

1-js/02-first-steps/11-logical-operators #11

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EmilyQiRabbit added 15 commits April 24, 2018 07:26

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leviding merged commit d9a6e9a into javascript-tutorial:zh-hans Apr 27, 2018

leviding added 翻译完成 and removed 正在校对 labels Apr 27, 2018

		@@ -1,13 +1,13 @@
		The answer: first `1`, then `2`.
		答案：第一个是 `1`，然后是 `2`。

		@@ -1,10 +1,10 @@
		importance: 3
		重要性：3

		@@ -1,10 +1,10 @@
		importance: 5
		重要性：5

		@@ -1,10 +1,10 @@
		importance: 5
		重要性：5

		@@ -1,10 +1,10 @@
		importance: 3
		重要性：3

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EmilyQiRabbit commented Apr 23, 2018

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wavezhang commented Apr 23, 2018

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EmilyQiRabbit commented Apr 23, 2018

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