![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title> </title>
<style type="text/css">
.box{width:310px;height:150px;border:1px solid red;margin:100px auto;padding:10px;}
h2{width:250px;height:20px;display: block;line-height: 20px;margin:0 auto;text-align:center;}
</style>
<script type="text/javascript">
var number,text,jieguo;
window.onload=function(){
text=document.getElementById('text');
jieguo=document.getElementById('jieguo');
}
function jisuan(){
var a=Number(text.value);
if(typeof(a)=="number"){
if(!isNaN(a)){
if(a>=90 ){
jieguo.innerHTML=a+"优秀";
}else if(a>=80){
jieguo.innerHTML=a+"良好";
}else if(a>=79){
jieguo.innerHTML=a+"一般";
}else if(a>=60){
jieguo.innerHMTL=a+"及格";
}else{
jieguo.innerHTML=a+"要努力呀";
}
}else{
jieguo.innerHTML="你输入的不是数字,请重新输入";
}
}
}
</script>
</head>
<body>
<div class="box">
<h2>判断成绩</h2><br>
<span>请输入成绩:</span>
<input id="text" type="text" value=""><input type="button" onclick="jisuan();" value="判断"><br>
<span id="jieguo"></span>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例