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老师批语：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html"; charset="utf-8" />
<title>第一章</title>
<link rel="icon" type="image/x-icon" href="static/images/favicon.ico" />
<!-- <script type="text/javascript" src="static/all.js"></script> -->
<script>
document.write('你好')
</script>
</head>
<body>
<!-- <script>
alert('帅哥')
</script> -->
<script>
// var x=8;
// console.log(x)
var grade=59;
if(grade>=60){
alert("成绩合格");
}else{
alert("不合格");
}
var years=1998;
if(years%4 !=0){
alert("是闰年");
}
var grade=77;
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");
}
// }else if(grade>70){
// alert("良");
// }else if(grade>60){
// alert("及格");
// }else(grade<60){
// 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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