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用JavaScript做闰年与成绩判断2
左手Leon的博客
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827 people have browsed it

实例-javascript闰年判断与成绩判断

<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>javascript闰年判断与成绩判断</title>
	<script type="text/javascript">	
		function checkYear(){
			var year=document.getElementById("year").value;
			if (year%4==0) {
				if (year%100==0) {
					alert(year+'是世纪闰年');
				}else{
					alert(year+'是普通闰年');
				}
			}else{
				alert(year+'不是闰年');
			};
		}

		function checkScore(){
			var score=document.getElementById("score").value;
			if (score>60) {
				if (score<=80) {
					alert('成绩是'+score+'，不错');
				}else if(score>80&&score<=100){
					alert('成绩是'+score+'，非常优秀啊');
				}
			}else{
				alert('成绩是'+score+'，还要再努力哦');
			};
		}
	</script>
</head>
<body>
	<div name="myDiv">
		<input id="year" type="number" placeholder="输入检查的年份">
	</div>
	<div>
		<input id="score" type="number" placeholder="输入检查的成绩">
	</div>
	<button onclick="checkYear()">闰年判断</button>
	<button onclick="checkScore()">成绩判断</button>
</body>
</html>

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学习心得：

1、查找了javascript对input标签中值的提取，有两种方法

一种为document.getElementsById().value

另一种在网页中需要再加一个form，然后使用例如myForm.name.valuer的方法取得值

2、在使用alert输出信息时，字符串与变量的连接需要使用“+”，在php中使用“.”。如果连接符少了，不会提示错误，但也不显示信息


Correction status：Uncorrected

Teacher's comments：
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