擅长:python、mysql、java
<p>可以使用<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes" rel="nofollow noreferrer">Array.includes()</a>检查某个元素是否属于数组,然后使用<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of" rel="nofollow noreferrer">for ... of</a>循环遍历字符串并执行以下操作:</p>
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<pre class="snippet-code-js lang-js prettyprint-override"><code>const letter = ['a', 'b', 'c', 'd'];
const word = "Black";
for (const char of word)
{
if (letter.includes(char))
console.log(char);
}</code></pre>
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^{pr2}$
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