根据工资计算应缴纳税额是一个分段函数求和问题。今日遇到的问题是：夫妻二人如何划分工资才能使得二人缴纳税额之和最少？
如果改成N个人划分固定金额使得缴纳税额最少呢？
<html>
<head>
<style>
table {
border-collapse: collapse;
}
td {
50%;
border-style: solid;
border- 2px;
border-collapse: separate;
}
</style>
</head>
<body>
<input id="csv" onchange="inflate()" onkeydown="hideInfo()" style="font-size:20px;100%;height:30px;">
<p id="info" style="color:red"></p>
<table>
<thead>
<tr>
<td>属性</td>
<td>取值</td>
</tr>
</thead>
<tbody>
<tr>
<td>月份</td>
<td id="month"></td>
</tr>
<tr>
<td>基本公资</td>
<td id="primary-pay"></td>
</tr>
<tr>
<td>岗位津贴 </td>
<td id="job-pay"></td>
</tr>
<tr>
<td>绩效津贴 </td>
<td id="work-pay"></td>
</tr>
<tr>
<td>季度奖金 </td>
<td id="semester-pay"></td>
</tr>
<tr>
<td>其他津贴 </td>
<td id="other-pay"></td>
</tr>
<tr>
<td>应发工资</td>
<td id="should-give"></td>
</tr>
<tr>
<td>保险 </td>
<td id="safe-cost"></td>
</tr>
<tr>
<td>住房公积金 </td>
<td id="house-cost"></td>
</tr>
<tr>
<td>其它 </td>
<td id="other-cost"></td>
</tr>
<tr>
<td>扣除五险一金后的工资</td>
<td id="minus-pay"></td>
</tr>
<tr>
<td>个税 </td>
<td id="tax"></td>
</tr>
<tr>
<td>实发工资</td>
<td id="final-pay"></td>
</tr>
<tr>
<td>姓名</td>
<td id="worker"></td>
</tr>
</tbody>
</table>
<div style="margin-top: 30px">
<h2>两个人最少税如何分钱</h2>
<input id="avoidTax" onchange="canculateStrategy()">
<p id="strategy"></p>
</div>
</body>
<script>
function $(sel) {
return document.querySelector(sel)
}
function parse(s) {
var s = s.replace(/, /g, "").replace(/,/g, "")
console.log(s)
var a = s.split(/s+/)
console.log(a)
for (var i = 0; i < a.length - 1; i++) {
a[i] = parseFloat(a[i])
if (isNaN(a[i])) {
a[i] = 0
}
}
return a
}
function hideInfo(s) {
$("#info").innerHTML = ""
}
function calculateTax(money) {
var rate = [0.03, 0.1, 0.2, 0.25, 0.3, 0.35, 0.45]
var diff = [0, 1500, 4500, 9000, 35000, 55000, 80000, 2e9]
for (var i = 0; i < diff.length; i++)diff[i] += 3500
var tax = 0
for (var i = 0; i < rate.length; i++) {
if (money >= diff[i]) {
var tempMoney = Math.min(diff[i + 1], money) - diff[i]
tax += tempMoney * rate[i]
}
}
return tax
}
function inflate() {
var s = $("#csv").value
var a = parse(s)
if (a.length != 14) {
$("#info").innerHTML = "输入不规范"
return
}
$("#month").innerHTML = a[0]
$("#primary-pay").innerHTML = a[1]
$("#job-pay").innerHTML = a[2]
$("#work-pay").innerHTML = a[3]
$("#semester-pay").innerHTML = a[4]
$("#other-pay").innerHTML = a[5]
var shouldGive = 0
for (var i = 1; i < 6; i++) {
shouldGive += a[i]
}
$("#should-give").innerHTML = shouldGive + ""
$("#safe-cost").innerHTML = a[7]
$("#house-cost").innerHTML = a[8]
$("#other-cost").innerHTML = a[9]
var costSum = a[7] + a[8] + a[9]
var beforePay = shouldGive - costSum
$("#minus-pay").innerHTML = beforePay
var tax = calculateTax(shouldGive - costSum)
$("#tax").innerHTML = tax
$("#final-pay").innerHTML = beforePay - tax
$("#worker").innerHTML = a[13]
}
function canculateStrategy() {
var money = parseFloat($("#avoidTax").value)
var min = 0
var minTax = 2e9
for (var i = 0; i < money; i++) {
var now = calculateTax(i) + calculateTax(money - i)
if (now < minTax) {
minTax = now
min = i
}
}
$("#strategy").innerHTML = min + "+" + (money - min) + ",最少税额" + minTax
}
</script>
</html>