📄 05.html
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<html>
<head>
<title>JavaScript常量量</title>
</head>
<body>
<script language="JavaScript">
var a1 = 12;
var a2 = 0x12;
var a3 = 012;
document.write("12->" + a1);
document.write("<br>0x12->" + a2)
document.write("<br>012->" + a3);
document.write("<hr>");
var f1 = 3.14;
var f2 = 2.1e3;
document.write("2.1e3" + f2);
document.write("<hr>");
var b1 = true;
var b2 = 3>20;
document.write("表达式\"3>20\"的结果为: " + b2);
document.write("<hr>");
document.write("<pre>\t\"此情可待成追忆，\n\t只是当时已惘然\"</pre>");
</script>
</body>
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