（|）和（||）之间有什么区别？ [英] What's the difference between ( | ) and ( || )?

问题描述

Javascript中 | 和 || 之间的区别是什么？

What's the difference between | and || in Javascript?

此外，& 和&& 之间有什么区别？

Furthermore, what's the difference between & and &&?

推荐答案

| 是按位或 || 是合乎逻辑的或。

| is a bitwise or, || is a logical or.

按位或取两个数字并逐位比较它们，产生一个新的整数，它将两个输入的1位组合在一起。所以 0101 | 1010 将产生 1111 。

A bitwise or takes the two numbers and compares them on a bit-by-bit basis, producing a new integer which combines the 1 bits from both inputs. So 0101 | 1010 would produce 1111.

逻辑或 || 检查值的真实性（取决于类型，对于整数） 0为假，非零为真。它从左到右评估语句，并返回第一个值为truthy的值。所以 0101 || 1010 将返回 0101 这是真实的，因此整个声明都是真的。

A logical or || checks for the "truthiness" of a value (depends on the type, for integers 0 is false and non-zero is true). It evaluates the statement left to right, and returns the first value which is truthy. So 0101 || 1010 would return 0101 which is truthy, therefore the whole statement is said to be true.

相同类型的逻辑适用于& vs && 。 0101& 1010 = 0000 。但是 0101&& 1010 评估为 1010 （&& 返回最后一个真值，只要两个操作数都是真实的。）

The same type of logic applies for & vs &&. 0101 & 1010 = 0000. However 0101 && 1010 evaluates to 1010 (&& returns the last truthy value so long as both operands are truthy).

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