43 lines
1.0 KiB
Markdown
43 lines
1.0 KiB
Markdown
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---
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title: Use the every Method to Check that Every Element in an Array Meets a Criteria
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localeTitle: 使用every方法检查数组中的每个元素是否符合条件
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---
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## 使用every方法检查数组中的每个元素是否符合条件
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### 问题说明：
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使用`checkPositive`函数中的`every`方法检查`arr`每个元素是否为正数。该函数应返回一个布尔值。
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#### 相关链接：
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* [Array.prototype.every（）](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every)
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### 暗示
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不要忘记`return` 。
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## 解
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```javascript
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function checkPositive(arr) {
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// Add your code below this line
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return arr.every(val => val > 0);
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// Add your code above this line
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}
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checkPositive([1, 2, 3, -4, 5]);
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```
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## 替代方案
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```javascript
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function checkPositive(arr) {
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// Add your code below this line
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return arr.every(function(value) {
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return value > 0;
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});
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// Add your code above this line
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}
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checkPositive([1, 2, 3, -4, 5]);
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```
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