freeCodeCamp/guide/chinese/javascript/code-blocks/index.md

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---
title: Code Block
localeTitle: 代码块
---
## 介绍
在计算机编程中, **块**或代码**块**是组合在一起的代码段。块由一个或多个声明和语句组成。允许创建块的编程语言(包括嵌套在其他块中的块)称为块结构编程语言。 JavaScript就是这样一种编程语言。
JavaScript中的**块**语句用于对零个或多个语句进行分组。该块由一对花括号分隔。
```
{
statement_1;
statement_2;
...
statement_n;
}
```
[MDN链接](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/block)
## 例子
**块**语句通常与控制流语句一起使用(例如, `if...else` `for` `while` )和函数。
```
while (x < 10) {
x++;
}
function addnums(num1, num2) {
var sum = 0;
sum = num1 + num2;
return sum;
}
```