Correcting teacher:PHPz
Correction status:qualified
Teacher's comments:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>简单计算器</title>
</head>
<body>
<input type="text" id="shu1" size="7">
<select id="ys">
<option>+</option>
<option>-</option>
<option>*</option>
<option>/</option>
<option>%</option>
</select>
<input type="text" id="shu2" size="7">
<button type="button" id="js" value="btn">=</button>
<p id="jg">结果:</p>
<script>
document.getElementById("js").onclick =function(){
var shu1 = document.getElementById("shu1").value;
var shu2 = document.getElementById("shu2").value;
var ys = document.getElementById("ys").value;
var zhjg =true;
if(shu1==''||shu2==''){
alert('输入框不能为空');
return;
}
if(zhjg){
switch(ys){
case '+' :
result = "结果:" + ((parseFloat(shu1)*100 + parseFloat(shu2)*100)/100);
break;
case '-' :
result = "结果:" + (shu1 - shu2);
break;
case '*' :
result = "结果:" + (shu1 * shu2);
break;
case '/' :
if(shu2==0){
result ="除数不能为0"
}else{
result = "结果:" + (shu1 / shu2);
}
break;
case '%' :
if(shu2==0){
result ="除数不能为0"
}else{
result = "结果:" + (shu1 % shu2);
}
break;
}
}
document.getElementById('jg').innerHTML=result;
}
</script>
</body>
</html>