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<!DOCTYPE html>
<html>
<head>
<title>JavaScript第一章(基础)</title>
<link rel="icon" type="image/x-icon" href="static/images/favicon.ico">
<script>
// 1、在页面head标签的内容部分插入script标签，并在script标签的内容部分书写js程序
document.write('你好')
</script>
<script type="text/javascript" src="static/all.js"></script>
</head>
<body>
<script type="text/javascript">
//1.给学生的具体成绩划分等级
var grade=69;
if(grade>=90 && grade <=100){
alert('优秀');
}else if(grade>=80 && grade <=89){
alert('良好');
}else if(grade>=70 && grade <=79){
alert('良');
}else if(grade>=60 && grade <=69){
alert('及格');
}else{
alert('不及格');
}
//2判断是否为闰年
var years=1996;
if(years%4 !=0 || years%100 !=0){
alert('不是闰年');
}else{
alert('是闰年!');
}
</script>
</body>
</html>