当前位置: 首页>>代码示例 >>用法及示例精选 >>正文


Javascript array.includes()用法及代码示例


array.includes()是JavaScript中的内置函数,用于了解数组中是否存在特定元素,因此返回true或false,即如果存在该元素,则返回true或false
用法:

array.includes(searchElement)

参数:
searchElement:是要搜索的元素。
返回值:
它返回一个布尔值,即True或False。

例子:


Input:
[1, 2, 3, 4, 5].includes(2);
Output:
true
Input:
[1, 2, 3, 4, 5].includes(9);
Output:
false

JavaScript代码显示array.includes()函数的工作方式:
代码1:

<script> 
  
    // Taking input as an array A 
    // having some elements. 
    var A = [ 1, 2, 3, 4, 5 ]; 
  
    // include() function is called to 
    // test whether the searching element 
    // is present in given array or not. 
     a = A.includes(2) 
  
    // Printing result of function. 
    document.write(a); 
</script>

输出:

 true

代码2:

<script> 
   // Taking input as an array A 
   // having some elements. 
    var name = [ 'gfg', 'cse', 'geeks', 'portal' ]; 
  
   // include() function is called to 
   // test whether the searching element 
   // is present in given array or not. 
    a = name.includes('cat') 
  
    // Printing result of function 
    document.write(a); 
</script>

输出:

 false


相关用法


注:本文由纯净天空筛选整理自Kanchan_Ray大神的英文原创作品 JavaScript | array.includes() function。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。