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<!DOCTYPE html>
<html>
<head>
<title>Using a constructor to set up common objects</title>
<meta charset="utf-8">
<script src="../assert.js"></script>
<link rel="stylesheet" type="text/css" href="../assert.css">
</head>
<body>
<script type="text/javascript">
function Ninja() {
this.skulk = function() {
return this;
};
}

var ninja1 = new Ninja();
var ninja2 = new Ninja();

assert(ninja1.skulk() === ninja1,
"The 1st ninja is skulking");
assert(ninja2.skulk() === ninja2,
"The 2nd ninja is skulking");
</script>
</body>
</html>

将函数作为构造函数进行调用是比较强大的一个特性