JavaScript 中的 new 运算符

javascriptweb developmentobject oriented programming更新于 2025/8/30 7:08:17

new 运算符用于创建具有构造函数的内置对象类型的用户定义对象类型实例。

以下是 JavaScript 中 new 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;
   }
   .result {
      font-size: 20px;
      font-weight: 500;
      color: blueviolet;
   }
</style>
</head>
<body>
<h1>New Operator in JavaScript</h1>
<div class="result"></div>
<br />
<button class="btn">点击此处</button>
<h3>Click on the above button to create the object person1 from Person
constructor</h3>
<script>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   function Person(name, age, designation) {
      this.name = name;
      this.age = age;
      this.designation = designation;
   }
   let person1 = new Person("Rohan Sharma", 19, "student");
   BtnEle.addEventListener("click", () => {
      resEle.innerHTML = "person1.name = " + person1.name + "<br>";
      resEle.innerHTML += "person1.age = " + person1.age + "<br>";
      resEle.innerHTML +=
      "person1.designation = " + person1.designation + "<br>";
   });
</script>
</body>
</html>