JavaScript 中的 Array.flat() 方法。

javascriptweb developmentobject oriented programming更新于 2025/8/21 6:36:17

JavaScript Array.flat() 方法用于以递归方式展平数组直至指定深度。它不会操作原始数组，而是创建一个新的展平数组。

以下是 Array.flat() 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;
   }
   .result,.sample {
      font-size: 20px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>Array.flat() method</h1>
<div class="sample"><pre>[1,2,3,[4,5],[6,[7,8]]]</pre></div>
<div style="color: green;" class="result">After flat : <br></div>
<button class="btn">点击此处</button>
<h3>
Click on the above button to flat the above array by depth 1
</h3>
<script>
   let resEle = document.querySelector(".result");
   let sampleEle = document.querySelector(".sample");
   let arr = [1,2,3,[4,5],[6,[7,8]]];
   document.querySelector(".Btn").addEventListener("click", () => {
      let store = arr.flat(1);
      store.forEach((item,index) => {
         resEle.innerHTML += index + ' : ' + item + ' ';
      });
   });
</script>
</body>
</html>