Why can't I overwrite the prototype of `Array` (`Array.prototype`)?
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Published on 2012-10-10T02:53:24Z
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2012/10/10
3:37 UTC
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JavaScript
I set the prototype of Array as an instance of my, I think book.aa will display "aa", but it displays "undefined", why? Thanks!
<html>
<head>
<title>Array Properties</title>
<h2>Array Properties</h2>
<script type="text/javascript">
function my() {
this.aa = 'aa';
}
Array.prototype = new my();
Array.prototype.bb = "bb";
var book = new Array();
book[0] = "War and Peace";
</script>
</head>
<body bgcolor="lightblue">
<script type="text/javascript">
document.write(book.aa+book.bb);
</script>
</body>
</html>
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