JavaScript 中的 Array.prototype.includes() 方法。
JavaScript Array.protoype.includes() 方法用于检查数组是否包含某个给定的元素。
以下是 Array.protoype.includes() 方法的代码 −
示例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <style> body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 20px; font-weight: 500; } </style> </head> <body> <h1>JavaScript Array includes()</h1> <div class="sample"></div> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to check if the array contains lion element or not</h3> <script> let fillEle = document.querySelector(".sample"); let arr = ["cow", "bull", "lion", "tiger", "sheep"]; fillEle.innerHTML = arr; document.querySelector(".Btn").addEventListener("click", () => { fillEle.innerHTML = "Lion is present in array: " + arr.includes("lion"); }); </script> </body> </html>
输出
以上代码将生成以下输出 −
单击“点击此处”按钮 −
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