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a == b 比较a和b是否相等
a > b 比较a是否大于b
a >= b 比较a是否大于等于b
a < b 比较a是否小于b
a <= b 比较a是否小于等于b
a != b 比较a是否不等于b

<html>
<head>
<title>比较运算符</title>
</head>
<body>
<script language="javascript">
<!--
a = 10;
b = 5;
document.write('a = ',a,',b = ',b,'<br>');
document.write('a == b = ',a==b,'<br>');
document.write('a > b = ',a>b,'<br>');
document.write('a < b = ',a<b,'<br>');
document.write('a != b = ',a!=b,'<br>');
//-->
</script>
</body>
</html>

图1.6