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手写instanceOf.html
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手写instanceOf.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>TEST</title>
<style>
body {
padding: 16px 32px;
}
pre {
padding: 16px;
line-height: 1.5;
background-color: #f5f5f5;
}
</style>
</head>
<body>
<H3>11.实现一个instanceOf</H3>
<pre>
function instanceOf(source, target) {
var proto = source.__proto__;
let prototype = target.prototype;
while (proto) {
if (proto === prototype) return true;
proto = proto.__proto__;
}
return false;
}
</pre>
<script>
function instanceOf(source, target) {
let proto = source.__proto__;
let prototype = target.prototype;
while (proto) {
if (proto === prototype) return true;
proto = proto.__proto__;
}
return false;
}
function Person(name) {
this.name = name;
}
var person = new Person('哈哈哈哈')
console.log('instanceOf(person, Person)', instanceOf(person, Person))
console.log('instanceOf(person, Object)', instanceOf(person, Object))
console.log('instanceOf(person, Function)', instanceOf(person, Function))
console.log('instanceOf(Person, Function)', instanceOf(Person, Function))
console.log('instanceOf(Function, Object)', instanceOf(Function, Object))
console.log('instanceOf(Object, Function)', instanceOf(Object, Function))
</script>
</body>
</html>