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。
array.includes(searchElement, start)
searchElement - 要搜索的元素
start - 默认为0。从该位置开始搜索。
它返回一个布尔值,即True或False。
Chrome | 41 |
Edge | 9 |
Firefox | 40 |
Opera | 28 |
JavaScript TypedArray includes()方法
链接:https://www.learnfk.comhttps://www.learnfk.com/javascript/javascript-typedarray-includes-method.html
来源:LearnFk无涯教程网
<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
JavaScript TypedArray includes()方法
链接:https://www.learnfk.comhttps://www.learnfk.com/javascript/javascript-typedarray-includes-method.html
来源:LearnFk无涯教程网
<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
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