如何使用映射变换 JavaScript 数组?
以下是使用映射变换 JavaScript 数组的代码。
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; } .result,.sample { font-size: 18px; font-weight: 500; color: rebeccapurple; } .result { color: red; } </style> </head> <body> <h1>Transform JavaScript arrays using maps</h1> <div class="sample">[22,33,44,55]</div> <br /> <div class="result"></div> <br /> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to square each element of the above array</h3> <script> let resEle = document.querySelector(".result"); let BtnEle = document.querySelector(".Btn"); let arr = [22, 33, 44, 55]; BtnEle.addEventListener("click", () => { resEle.innerHTML = arr.map((a) => a * a); }); </script> </body> </html>
输出
以上代码将生成以下输出 −
单击“单击此处”按钮时 −
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