在 JavaScript 中向方法传递空参数

javascriptweb developmentobject oriented programming更新于 2025/8/24 17:16:17

以下是在 JavaScript 中向方法传递空参数的代码 −

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 {
      font-size: 18px;
      font-weight: 500;
      color: blueviolet;
   }
</style>
</head>
<body>
<h1>Passing empty parameter to a method</h1>
<div class="result"></div>
<button class="btn">点击此处</button>
<h3>Click on the above button to call multiply function and pass empty
parameters to it</h3>
<script>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   function multiply(a = 2, b = 4) {
      return a * b;
   }
   BtnEle.addEventListener("click", () => {
      resEle.innerHTML = "The multiplication of numbers = " + multiply();
   });
</script>
</body>
</html>