JavaScript 中的函数借用。

javascriptweb developmentobject oriented programming更新于 2025/9/4 14:36:17

JavaScript 中，call()、apply() 和 bind() 用于借用方法。

以下是 JavaScript 中借用方法的代码 −

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: 18px;
      font-weight: 500;
      color: rebeccapurple;
   }
   .result {
      color: red;
   }
</style>
</head>
<body>
<h1>Borrowing a method in JavaScript</h1>
<div class="sample"></div>
<div class="result"></div>
<button class="btn">点击此处</button>
<h3>Click on the above button to borrow the welcome method of object obj</h3>
<script>
   let sampleEle = document.querySelector(".sample");
   let resultEle = document.querySelector(".result");
   let obj = {
      firstName: "Rohan",
      lastName: "Sharma",
      welcome() {
         return "Welcome " + this.firstName + " " + this.lastName;
      },
   };
   let obj1 = {
      firstName: "John",
      lastName: "Shaw",
   };
   sampleEle.innerHTML = "obj.welcome() = " + obj.welcome();
   document.querySelector(".Btn").addEventListener("click", () => {
      resultEle.innerHTML = "obj1.welcome() = " + obj.welcome.call(obj1);
   });
</script>
</body>
</html>