JavaScript 展开运算符

javascriptweb developmentobject oriented programming更新于 2025/12/13 17:16:17

JavaScript 展开运算符允许我们将数组展开为单独的数组元素。要使用展开运算符，数组名称前面应有三个点 (…)。

以下是 JavaScript 展开运算符的代码 −

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,
   .result {
      font-size: 18px;
      font-weight: 500;
      color: red;
   }
   .result {
      color: rebeccapurple;
   }
</style>
</head>
<body>
<h1>JavaScript Spread Operator</h1>
<div class="sample"></div>
<div class="result"></div>
<button class="btn">点击此处</button>
<h3>
Click on the above button combine the two arrays using spread operator
into a new one
</h3>
<script>
   let resultEle = document.querySelector(".result");
   let sampleEle = document.querySelector(".sample");
   let arr1 = [1, 2, 3, 4, 5];
   let arr2 = ["A", "B", "C", "D", "E"];
   sampleEle.innerHTML = "arr1 = " + arr1 + "<br> arr2 = " + arr2;
   document.querySelector(".Btn").addEventListener("click", () => {
      let arr3 = [...arr1, ...arr2];
      resultEle.innerHTML = "arr3 = " + arr3;
   });
</script>
</body>
</html>