【JS】IF ELSE语句

Osinghong2个月前 (03-10)成果展示171

示例一：

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>d24c04429 欧永鸿</title>
	</head>
	<body>
		<script>
			var age = prompt("请输入您的年龄");
			if (age >= 18) {
				alert("你可以进入网吧");
			} else {
				alert("您还未成年");
			}
		</script>
	</body>
</html>

示例二：

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>d24c04429 欧永鸿</title>
	</head>
	<body>
		<script>
			var year = prompt("请输入年份：");
			if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
				alert(year + "年是闰年");
			} else {
				alert(year + "年是平年");
			}
		</script>
	</body>
</html>

示例三：

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>d24c04429 欧永鸿</title>
	</head>
	<body>
		<script>
			var score = prompt("请输入你的分数");
			if (score >= 90) {
				alert("A");
			} else if (score >= 80) {
				alert("B");
			} else if (score >= 70) {
				alert("C");
			} else if (score >= 60) {
				alert("D");
			} else {
				alert("E");
			}
		</script>
	</body>
</html>

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