<!doctype>
<html>
<head>
<meta charset="uft-8">
<title></title>
</head>
<body>
<script>
function gz(){
var a = prompt("請輸入您的工資");
var b = 0;
if(a<=3500){
alert("您無需繳稅");
}else if(a>3500，a<=5000){
b=（a-3500）*0.03
alert("您需要繳稅"+b+"元");
}else if(a>5000,a<=9000){
b=(a-5000*)*0.1+45
alert("您需要繳稅"+b+"元");
}else{
b=(a-9000)*0.2+445
alert("您需要繳稅"+b+"元")；
}
}
</script>
<button onclick="gz()">個人所得稅計算器</button>
</body>
</html>