Update translation of 1-js/02-first-steps/07-operators#508
Merged
MartinsYong merged 8 commits intomasterfrom Nov 1, 2019
Merged
Update translation of 1-js/02-first-steps/07-operators#508MartinsYong merged 8 commits intomasterfrom
MartinsYong merged 8 commits intomasterfrom
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MartinsYong
suggested changes
Oct 28, 2019
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| alert( a ); // 2，自增加一次 | ||
| alert( b ); // 2，自增加一次 | ||
| alert( a ); // 2，自加一次 |
| 所以，对此有一些专门的运算符： | ||
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| - **自相加** `++` 将变量与 1 相加： | ||
| - **自加** `++` 将变量与 1 相加： |
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| ```warn | ||
| 自相加/自相减只能应用于变量。尝试将其应用于数值（比如 `5++`）会报错。 | ||
| 自加/自减只能应用于变量。试一下，将其应用于数值（比如 `5++`）则会报错。 |
| 那么他们有区别吗？有，但只有当我们使用 `++/--` 的返回值时才能看到区别。 | ||
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| 让我们来明确了解这一点。我们知道，所有的运算符都有返回值。自相加/自相减也不例外。前置形式返回一个新的值，但后置返回原来的值（做加法/减法之前的值）。 | ||
| 详细点说。我们知道，所有的运算符都有返回值。自加/自减也不例外。前置形式返回一个新的值，但后置返回原来的值（做加法/减法之前的值）。 |
| ``` | ||
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| `(*)` 所在的行是前置形式 `++counter`，对 `counter` 做自相加，返回的是新的值 `2`。因此 `alert` 显示的是 `2`。 | ||
| `(*)` 所在的行是前置形式 `++counter`，对 `counter` 做自加运算，返回的是新的值 `2`。因此 `alert` 显示的是 `2`。 |
| 总结： | ||
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| - 如果自相加/自相减的值不会被使用，那么两者形式没有区别： | ||
| - 如果自加/自减的值不会被使用，那么两者形式没有区别： |
| alert( counter ); // 2，以上两行作用相同 | ||
| ``` | ||
| - 如果我们想要对变量自相加 **并且** 立刻使用值，那么我们需要使用前置形式： | ||
| - 如果我们想要对变量进行自加操作，**并且** 需要立刻使用自加后的值，那么我们需要使用前置形式： |
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| ````smart header="自相加/自相减和其它运算符的对比" | ||
| `++/--` 运算符同样可以在表达式内部使用。它们的优先级比绝大部分的运算符要高。 | ||
| ````smart header="自加/自减和其它运算符的对比" |
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Please make the requested changes. After it, add a comment "/done". |
Member
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校对完毕，感谢~ |
Member
Author
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@MartinsYong DONE, thanks. |
MartinsYong
approved these changes
Nov 1, 2019
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目标章节：1-js/02-first-steps/07-operators
当前上游最新 commit：70ca842bef2390bc26d13dea2b856838aa890fe0
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