什么是“"和""，在Javascript中没有引号的意思? [英] What does ' ', and " ", and no quotes mean in Javascript?

问题描述

我意识到我一直在不知为何的情况下在它们之间切换，并且发现很难进行搜索.

I realized I've been switching between them with no understanding as to why, and am finding it hard to search for.

推荐答案

''和" 是同一件事；它们用于定义字符串文字.

' ' and " " are the same thing; they are used to define string literals.

不带引号的内容可以是标识符，关键字，非字符串文字，属性名称或数字(可能省略了).

Things without quotes can be an identifier, keyword, non-string literal, property name or a number (may have missed one).

示例:

"hello world"        literal (string)
'hello world'        literal (string) with same contents
document             identifier (object)
{ a: 1 }             property name
if                   keyword (start conditional statement)
3.4                  literal (number)
/abc/                literal (regex object)

用单引号引起来的字符串文字不需要转义的双引号，反之亦然，例如:

String literals that are enclosed in single quotes don't need escaped double quotes and visa versa, e.g.:

'<a href="">click me</a>'    HTML containing double quotes
"It's going to rain"         String containing single quote

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