JavaScript Array includes()方法是JavaScript中的内置函数，用于确定数组中是否存在特定元素。如果元素存在于数组中，则此方法返回 true ，否则返回false。
- includes()方法区分大小写。
includes - 语法
array.includes(searchElement, start)
includes - 参数
searchElement - 要搜索的元素
start - 默认为0。从该位置开始搜索。
includes - 返回值
它返回一个布尔值，即True或False。
includes - 浏览器支持
| Chrome | 41 |
| Edge | 9 |
| Firefox | 40 |
| Opera | 28 |
includes - 例子1
JavaScript TypedArray includes()方法
<script type="text/javascript"> // JavaScript to illustrate includes() method //Taking input as an array var JavaTpoint= [12,24,56,78,2]; a = JavaTpoint.includes(2) document.write(a); // expected output: arr[Output:2] </script>
输出:
True
includes - 例子2
JavaScript TypedArray includes()方法
<script type="text/javascript"> // JavaScript to illustrate includes() method //Taking input as an array var JavaTpoint= [12,24,56,78]; a = JavaTpoint.includes(2) document.write(a); // expected output: arr[Output:false] </script>
输出:
False
