JavaScript array.keys() 方法
JavaScript array.keys() 创建一个数组迭代器对象,其中只包含一个数组的键
下面是 array.keys() 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 keys()</h1> <div class="sample"></div> <button class="Btn">CLICK HERE</button> <h3> Click on the above button to see the keys of the array </h3> <script> let fillEle = document.querySelector(".sample"); let arr = ["H", "E", "L", "L", "O"]; fillEle.innerHTML = arr; arr = arr.keys(); document.querySelector(".Btn").addEventListener("click", () => { fillEle.innerHTML = ""; for (let x of arr) { fillEle.innerHTML += x + "<br>"; } }); </script> </body> </html>
输出
单击“点击此处”按钮 −
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