JS——绝对值

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script>
    /* function abs(x) {
        if (x > 0) {
            return x;
        } else {
            return -x;
        }
    }
    alert(abs(-3)); */
    alert(Math.abs(-3));
</script>
</head>
<body>

</body>
</html>
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