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Home > List of blog posts > JavaScript第1课：基础案例_判断是否为闰年_2019.3.25
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JavaScript第1课：基础案例_判断是否为闰年_2019.3.25
风雨中的脚步的博客
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702 people have browsed it

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
<script>
	// var year=2000;
	// if((year%4==0&&year%100!=0)||(year%400==0)){  //能被4整除，但是不能被100整除，或者能被400整除的
	// 	alert("是闰年");
	// }else{
	// 	alert("不是闰年");
	// }

	var a=80;
	if(a>=90;){                             //判断条件是否成立，成立则输出，不成立则继续下一条判断
		alert('你的成绩表现为：优秀');
	}else if(a>=80;){
		alert('你的成绩表现为：良好');
	}else if(a>=70;){
		alert('你的成绩表现为：良好');
	}else if(a>=60;){
		alert('你的成绩表现为：良好');
	}else{                                  //如果以上条件都不成立则输出
		alert('成绩不及格，请加油哦');
	}
</script>
</body>
</html>

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Correction status：Uncorrected

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