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法律研究如何在 JavaScript 中检查某对象是否为类的实例？
以下是检查 JavaScript 中对象是否是类实例的代码−
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>Check if an object is an instance of a Class</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to check if student1 object is an instance of Student</h3>
<script>
let resEle = document.querySelector(".result");
function Student(name, age, standard) {
this.name = name;
this.age = age;
this.standard = standard;
}
let student1 = new Student("Rohan", 18, 12);
document.querySelector(".Btn").addEventListener("click", () => {
if (student1 instanceof Student) {
resEle.innerHTML = "student1 is instance of Student";
} else {
resEle.innerHTML = "student1 is not an instance of Student";
}
});
</script>
</body>
</html>输出
在单击“点按此处”按钮之后−
更新于：20-Jul-2020
343 次浏览
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