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<!DOCTYPE html>
<html>
<title>JavaScript || 逻辑或运算符示例 - 基础教程(div.cn)</title>
<body>
<h1>JavaScript || 逻辑或运算符</h1>
<p>如果一个或两个表达式为真,逻辑或运算符(||)返回true,否则返回false:</p>
<script>
var a = 20;
var b = 30;
document.write(
(a == 20 || b == 5) + "<br>" +
(a != 20 || b == 5)
);
</script>
</body>
</html>