个税计算器 / 微信小程序开发

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2019 年 1 月 1 日即将到来，码农们除了关心自己的技能之外，还有薪资是不是可以多拿点。每次算的时候 都要百度一下个人所得税，但是很多都是老的税率计算，找一个新的出来还是比较麻烦，所以个人开发了一个最新税率的小程序。解决和我有着一样痛苦的码农们的问题。根据最新税改后计算个人所得税的计算器。目前支持南京，后续开放 杭州 上海 北京等城市。如果有疑问的可以加最下方 开发者微信。

首先在微信官网下载微信小程序开发工具 https://mp.weixin.qq.com

在 https://mp.weixin.qq.com 注册小程序账号，完成个人实名认证。
在小程序后台拿到 appid，下面就可以开发了。

实例查看二维码：

先使用 weui 小程序 ui 框架就行页面布局

<button block type=”dark” bindtap=’calculationBindtap’> 计算 </button>
其次写 JS 代码（计算按钮逻辑代码）
import data from ‘./data’

const app = getApp;

Page({
data: {
options1: data,
value: ‘1’,
checked: true,
standard: 1,
marking: 5000,
beforetaxCount: 0,
specialitemCount: 0
},

calculationBindtap:function(){
// 开始计算 计算完成把计算结果放在 result 对象中
var beforetaxCount = this.data.beforetaxCount;
var specialitemCount = this.data.specialitemCount;
var marking = this.data.marking;
if (beforetaxCount == null || beforetaxCount == 0 || beforetaxCount == ”){
wx.showToast({
title: ‘ 输入正确薪资 ’,
mask: true,
icon: ‘loading’
})
return;
}
if (specialitemCount == null || specialitemCount == ”){
specialitemCount = 0;
}
// 开始计算

var oldNum = 0.08;
var medNum = 0.02;
var unemNum = 0.005;
var workNum = 0;
var giveNum = 0;

var providentfundNum = 0.08;

var insuranceBase = 19935;
var providentfundBase = 25300;

var oldcount = 0;
var medcount = 0;
var unemcount = 0;
var workcount = 0;
var givecount = 0;

var providentfundcount = 0;

var privateFee = 0;
var plusFee = 0;

if(this.data.checked){
if (parseFloat(beforetaxCount) > parseFloat(insuranceBase)) {
oldcount = parseFloat(insuranceBase) * parseFloat(oldNum);
medcount = parseFloat(insuranceBase) * parseFloat(medNum);
unemcount = parseFloat(insuranceBase) * parseFloat(unemNum);
workcount = parseFloat(insuranceBase) * parseFloat(workNum);
givecount = parseFloat(insuranceBase) * parseFloat(giveNum);
} else {
oldcount = parseFloat(beforetaxCount) * parseFloat(oldNum);
medcount = parseFloat(beforetaxCount) * parseFloat(medNum);
unemcount = parseFloat(beforetaxCount) * parseFloat(unemNum);
workcount = parseFloat(beforetaxCount) * parseFloat(workNum);
givecount = parseFloat(beforetaxCount) * parseFloat(giveNum);
}

if (parseFloat(beforetaxCount) > parseFloat(providentfundBase)) {
providentfundcount = parseFloat(providentfundBase) * parseFloat(providentfundNum);
} else {
providentfundcount = parseFloat(beforetaxCount) * parseFloat(providentfundNum);
}
}

// 保险总费用
var totalInsuranceFee = parseFloat(oldcount) + parseFloat(medcount) + parseFloat(unemcount) + parseFloat(workcount) + parseFloat(givecount);
// 公积金费用
var totalProvidentfundFee = providentfundcount;

// 下面的钱 交税
console.log(this.data.marking);
var otherFee = parseFloat(beforetaxCount) – parseFloat(totalInsuranceFee) – parseFloat(totalProvidentfundFee) – parseFloat(this.data.marking) – parseFloat(specialitemCount);

if (parseFloat(otherFee) <= 3000 && parseFloat(otherFee) > 0) {
privateFee = parseFloat(otherFee) * 0.03;
plusFee = 0;
}
if (parseFloat(otherFee) <= 12000 && parseFloat(otherFee) > 3000) {
privateFee = parseFloat(otherFee) * 0.1;
plusFee = 210;
}
if (parseFloat(otherFee) <= 25000 && parseFloat(otherFee) > 12000) {
privateFee = parseFloat(otherFee) * 0.2;
plusFee = 1410;
}
if (parseFloat(otherFee) <= 35000 && parseFloat(otherFee) > 25000) {
privateFee = parseFloat(otherFee) * 0.25;
plusFee = 2660;
}
if (parseFloat(otherFee) <= 55000 && parseFloat(otherFee) > 35000) {
privateFee = parseFloat(otherFee) * 0.3;
plusFee = 4410;
}
if (parseFloat(otherFee) <= 80000 && parseFloat(otherFee) > 55000) {
privateFee = parseFloat(otherFee) * 0.35;
plusFee = 7160;
}
if (parseFloat(otherFee) > 80000) {
privateFee = parseFloat(otherFee) * 0.45;
plusFee = 15160;
}

var result = {};

result.insuranceCount = totalInsuranceFee;
result.providentfundCount = totalProvidentfundFee;
result.providentfundNum = parseFloat(providentfundNum) * 100;
result.money = parseFloat(beforetaxCount) – parseFloat(totalInsuranceFee) – parseFloat(totalProvidentfundFee) – parseFloat(privateFee) + parseFloat(plusFee);
result.privateFee = privateFee – parseFloat(plusFee);
result.specialitemCount = specialitemCount;
result.oldNum = parseFloat(oldNum) * 100;
result.medNum = parseFloat(medNum) * 100;
result.unemNum = parseFloat(unemNum) * 100;
result.workNum = parseFloat(workNum) * 100;
result.giveNum = parseFloat(giveNum) * 100;

result.oldcount = parseFloat(oldcount);
result.medcount = parseFloat(medcount);
result.unemcount = parseFloat(unemcount);
result.workcount = parseFloat(workcount);
result.givecount = parseFloat(givecount);

wx.setStorage({
key: ‘result’,
data: result,
success:function(){
wx.navigateTo({
url: ‘../calculation/calculationResult’,
})
}
})

},

})
把计算好的结果放在 result 对象中 通过 wx.setStorage 放在缓存中，传到下一个页面。最后展示出来。