没有函数或json的JavaScript花括号 [英] JavaScript curly braces with no function or json

问题描述

刚刚打开了客户端的javascript文件，第一行是这样的：

Just opened a client's javascript file and the first lines are along the lines of this:

{
    var s_account="blog";
}

我得不到。通常，根据我的经验，花括号缠绕一个函数...

Which I don't get. Normally, in my experience, curly braces wrap around a function...

function welcome(){ ...

...或 json JavaScript 对象

var attributes = { this : "that...

任何人都可以告诉我为什么在他们之前或之后没有文字的花括号？它做什么/有什么意义？

Can anyone tell me why there are curly braces with no text before them or after them? What does it do / what is the point of it?

推荐答案

任何人都可以告诉我为什么在他们之前或之后没有文字的花括号？它做什么/什么是它是什么？

Can anyone tell me why there are curly braces with no text before them or after them? What does it do / what is the point of it?

在Javascript中它们没有重要意义。它的行为与代码只是

There is no significant point to them in Javascript. It will act exactly the same as if the code was just

var  s_account="blog";

猜测

在其他具有块范围的语言中，这可能会限制变量的范围，但由于JS没有该功能（无论好坏），没有控制结构或功能的大括号基本上没有意义并被忽略。

Speculation

In other languages which have block scope, this might restrict the scope of the variable, but since JS doesn't have that feature (for better or worse), braces without a control structure or function are essentially meaningless and ignored.

很可能这段代码是从已删除的函数中遗留下来的，或者是但是声明。它绝对不是一个可以复制的模式。

Most likely this code was left over from a deleted function or if statement however. It definitely is not a pattern to be copied.

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