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批改状态：合格
老师批语：
<!DOCTYPE html>
<html>
<head>
<title>hello world!</title>
</head>
<body>
<script type="text/javascript">
var year=1000;
if(year%4==0 && year%100!=0 || year%400==0){
alert('是闰年')
}else{
alert('不是闰年')
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html>
<head>
<title>hello world!</title>
</head>
<body>
<script type="text/javascript">
var y=60;
if(y>=90){
alert('优秀')
}else if(y>=80 && y<=89){
alert('良好')
}else if(y>=70 && y<=79){
alert('良')
}else if(y>=60 && y<=69){
alert('及格')
}else if(y>=0 && y<=59){
alert('不及格')
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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