<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>個人所得稅</title>
</head>
<body>
<input type="text" placeholder="請輸入您的工資" id="gz" />
<input type="button" value="確定" onclick="grade()" />
<h1>稅后收入是： <span id="sh"></span>元</h1>
<script type="text/javascript">
function grade() {
var x = document.getElementById("gz").value;
var r = document.getElementById("sh");
var z = x - 3500;
if(x<= 1500) r.innerHTML="您需要上的稅0"
else if (z<=1500){
r.innerHTML=x-z*0.03;
}else if (z<=4500){
r.innerHTML=x-(z*0.10-105);
}else if (z<=9000){
r.innerHTML=x-(z*0.20-555);
}else if (z<=35000){
r.innerHTML=x-(z*0.25-1005);
}else if (z<=55000){
r.innerHTML=x-(z*0.30-2755);
}else if (z<=80000){
r.innerHTML=x-(z*0.35-5505);
}else r.innerHTML=x-(z*0.45-13505);
}
</script>
</body>
</html >