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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>变量、作用域</title>
</head>
<body>
<script type="text/javascript">
var a = {name: 'xm'}, b = [4];
b.push(a);
document.write(b);
document.write("<br>");
a=[];
a.push(b[0])
b=b[1];
document.write(b.name);
document.write("<br>");
document.write(a[0]);
document.write("<br>");
document.write(a instanceof Array);
</script>
</body>
</html>0
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