JavaScript 中的 Array.prototype.flatMap()。
JavaScript Array.prototype.flatMap() 函数将给定的嵌套数组压平为一个新的平面数组。
以下是 Array.prototype, flatMap() 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 flatMap()</h1> <div class="sample"></div> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to convert the nested array to flat array</h3> <script> let fillEle = document.querySelector(".sample"); let arr = ["cow", ["bull", "lion", "tiger"], "sheep"]; for (x of arr.entries()) { fillEle.innerHTML += x + "<br>"; } var entries = arr.entries(); document.querySelector(".Btn").addEventListener("click", () => { arr = arr.flatMap((x) => x); fillEle.innerHTML = ""; for (x of arr.entries()) { fillEle.innerHTML += x + "<br>"; } }); </script> </body> </html>
输出
上述代码将生成以下输出 −
点击“点击此处”按钮后 −
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