JavaScript中“和”有什么区别？

I saw this question and I am wondering about the same thing in JavaScript.

我看到了这个问题，我想知道JavaScript中的同样的事情。

If you use the character ' or the character " when making strings in JavaScript, the application seems to behave the same. So what is the difference between these two characters?

如果在JavaScript中创建字符串时使用字符'或字符'，则应用程序似乎表现相同。那么这两个字符之间有什么区别？

The only advantage I have seen in using ' to build strings is that I can do stuff like:

我在使用'构建字符串时看到的唯一优势是我可以做以下事情：

var toAppend = '<div id="myDiv1"></div>';

Instead of:

代替：

var toAppend = "<div id=\"myDiv1\"></div>";

Is there any significant difference between them that I should be aware of?

我应该注意到它们之间是否有任何显着差异？

8 个解决方案

#1

They are equivalent for all intents and purposes. If you want to use either one inside a string, it is a good idea to use the other one to create the string, as you noted. Other than that, it's all the same.

它们等同于所有意图和目的。如果你想在字符串中使用任何一个字符串，最好使用另一个来创建字符串，正如你所指出的那样。除此之外，它都是一样的。

#2

Although not technically a difference in Javascript, its worth noting that single quoted strings are not valid JSON, per se. I think that people automatically assume that since JSON is valid JS, that valid JS strings are also valid JSON, which isn't necessarily true.

虽然从技术上讲不是Javascript的差异，但值得注意的是单引号字符串本身并不是有效的JSON。我认为人们会自动认为既然JSON是有效的JS，那么有效的JS字符串也是有效的JSON，这不一定是真的。

E.g., {'key': 'Some "value"'} is not valid JSON, whereas {"key": "Some 'value'"} is.

例如，{'key'：'Some'值“'}不是有效的JSON，而{”key“：”Some'value'“}是。

#3

There's no difference. The reason for its existence is exactly what you mentioned

没有区别。它存在的原因正是你提到的

#4

I think there is another difference. If you do the following

我认为还有另一个不同之处。如果您执行以下操作

var str1 = 'The \' character';
var str2 = 'The " character';
var str3 = "The ' character";
var str4 = "The \" character";
document.write (str1.replace("'","%26");
document.write (str2.replace('"',"%22");
document.write (str3.replace("'","%26");
document.write (str4.replace('"',"%22");

The document.write will fail for str1 and str4. That is the difference, but I don't know if there is a workaround to make them work.

对于str1和str4，document.write将失败。这是不同的，但我不知道是否有解决方法使它们工作。

#5

Good practice, according to Mozilla, is to use " " in HTML (where ' ' cannot be used) while reserving ' ' in Javascript (where both " " and ' ' can be use indifferently)...

根据Mozilla的说法，良好的做法是在HTML中使用“”（其中''不能使用），同时在Javascript中保留''（其中“和”可以无差别地使用）......

#6

Try This :

尝试这个：

console.log("mama+"mama"")

Output : Uncaught SyntaxError: missing ) 
after argument list

Now Try :

现在尝试：

console.log('mama+"mama"')

Output :  mama+"mama"

#7

-1

Your example is the best example to describe the difference between the two....

你的例子是描述两者之间差异的最好例子....

#8

-1

WARNING!!!!

警告！！！！

There is a difference. When adding to arrays, you have to use one or the other. The array gets confused when you use two different types of quotes.

它们是有区别的。添加到数组时，您必须使用其中一个。当您使用两种不同类型的引号时，数组会混淆。

Ex: //WILL NOT WORK var array = ["apple","orange","banana"];

例如：//不会工作var array = [“apple”，“orange”，“banana”];

array.push('pear');

的Array.push（ '梨'）;

//WILL WORK var array = ["apple","orange","banana"];

//将工作var array = [“apple”，“orange”，“banana”];

array.push("pear");

的Array.push（ “梨”）;

#1

#2