JavaScript 立即调用函数表达式 (IIFE)

javascriptweb developmentobject oriented programming更新于 2025/12/11 7:40:17

JavaScript 立即调用函数表达式 (IIFE) 是一种 JavaScript 函数，它在定义后立即执行，因此无需手动调用 IIFE。

以下是 JavaScript 中立即调用函数表达式 (IIFE) 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: 18px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>JavaScript Immediately Invoked Function Expressions (IIFE)</h1>
<div class="sample"></div>
<script>
   let sampleEle = document.querySelector(".sample");
   (function () {
      sampleEle.innerHTML ="This code is invoked immediately as soon as it is defined";
   })();
</script>
</body>
</html>