W3Schools 在线编辑工具 V3.0

<html>
<body>

<script type="text/javascript">
var myBoolean=new Boolean();
document.write(myBoolean);
document.write("<br />");

var myBoolean=new Boolean(0);
document.write(myBoolean);
document.write("<br />");

var myBoolean=new Boolean(null);
document.write(myBoolean);
document.write("<br />");

var myBoolean=new Boolean("");
document.write(myBoolean);
document.write("<br />");

var myBoolean=new Boolean(false);
document.write(myBoolean);
document.write("<br />");

var myBoolean=new Boolean(NaN);
document.write(myBoolean);
document.write("<br />");
</script>

</body>
</html>

W3Schools 在线编辑工具（TIY） V3.0