38 lines
935 B
Markdown
38 lines
935 B
Markdown
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---
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title: Do...While Loop
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localeTitle: 做......循环
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---
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`do...while`循环与[`while`](http://forum.freecodecamp.com/t/javascript-while-loop/14668)循环密切相关。在do while循环中，在循环结束时检查条件。
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这是`do...while`循环的**语法** ：
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## 句法：
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```
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do {
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*Statement(s);*
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} while (*condition*);
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```
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**statement（s）：**在计算条件或布尔表达式之前**至少**执行**一次的**语句，并**在**每次条件计算结果为true时重新执行。
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**condition：**这里，条件是布尔表达式 。如果布尔表达式的计算结果为true，则再次执行该语句。当布尔表达式求值为false时，循环结束。
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## 例：
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```
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var i = 0;
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do {
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i = i + 1;
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console.log(i);
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} while (i < 5);
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Output:
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1
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2
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3
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4
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5
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```
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来源： [**做......同时**](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/do…while)
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