看了官方的小程序开发指南，做了个税计算器来练手。
效果如下：
项目结构如下：
一、简介
1、页面的样式主要使用了官方WeUI。
WeUI 是一套同微信原生视觉体验一致的基础样式库，下载地址https://github.com/Tencent/weui-wxss。
使用方法：
（1）新建一个目录style，把下载的WeUI源码里面的weui.wxss放进去；
（2）app.wxss中导入@import 'style/weui.wxss';
2、表单验证用了WxValidate.js
用法也比较简单：
（1）wxml中
录入框设置value值
<input type="digit" class="weui-input" name="beforeTax" value='{{form.beforeTax}}'/>
form绑定提交方法
<form bindsubmit='formSubmit'>
（2）js中
onLoad函数中初始化验证表单字段this.initValidate();
formSubmit函数调用验证函数
const params = e.detail.value
if (!this.WxValidate.checkForm(params)) {
const error = this.WxValidate.errorList[0]
this.showMessage(error)
return false
}
3、表格的实现
小程序中没有像网页的table表格控件，搜索了网上，用了view实现表格效果。
有一个注意的地方是网页table只需要设置第一行的每列宽度就行，但用view的话需要每行每列都设置宽度，否则每行内容长度
不一致时就错乱了。
二、主要文件源码
1、index.wxml
<form bindsubmit='formSubmit'>
<view class="weui-cells weui-cells_after-title">
<view class="weui-cell weui-cell_input">
<view class="weui-cell__hd">
<view class="weui-label">税前工资</view>
</view>
<view class="weui-cell__bd">
<input type="digit" class="weui-input" name="beforeTax" value='{{form.beforeTax}}'/>
</view>
<view class="weui-cell__ft">元</view>
</view>
<view class="weui-cell weui-cell_input">
<view class="weui-cell__hd">
<view class="weui-label">五险一金</view>
</view>
<view class="weui-cell__bd">
<input type="digit" class="weui-input" name="insurance" value="{{form.insurance}}"/>
</view>
<view class="weui-cell__ft">元</view>
</view>
<view class="weui-cell weui-cell_input">
<view class="weui-cell__hd">
<view class="weui-label">附加扣除</view>
</view>
<view class="weui-cell__bd">
<input type="number" class="weui-input" name="otherDeduct" value="{{form.otherDeduct}}"/>
</view>
<view class="weui-cell__ft">元</view>
</view>
<view class="weui-cell weui-cell_input">
<view class="weui-cell__hd">
<view class="weui-label">个税起征</view>
</view>
<view class="weui-cell__bd">
<input class="weui-input" name="threshold" disabled='disabled' value="5000"/>
</view>
<view class="weui-cell__ft">元</view>
</view>
<view class="weui-btn-area">
<button class="weui-btn green-btn" hover-class="green-hover-class" form-type="submit" >计算</button>
</view>
</view>
<view class="weui-cells__title">计算结果</view>
<view class="weui-cell weui-cell_input">
<view class="weui-cell__hd">
<view class="weui-label">应纳所得</view>
</view>
<view class="weui-cell__bd">
{{ resAfterDeduct }}
</view>
<view class="weui-cell__ft">元</view>
</view>
<view class="weui-cell weui-cell_input">
<view class="weui-cell__hd">
<view class="weui-label">适用税率</view>
</view>
<view class="weui-cell__bd">
{{ resTaxRate }}
</view>
<view class="weui-cell__ft">%</view>
</view>
<view class="weui-cell weui-cell_input">
<view class="weui-cell__hd">
<view class="weui-label">速算扣除</view>
</view>
<view class="weui-cell__bd">
{{ resQuickDeduct }}
</view>
<view class="weui-cell__ft">元</view>
</view>
<view class="weui-cell weui-cell_input">
<view class="weui-cell__hd">
<view class="weui-label">应缴税款</view>
</view>
<view class="weui-cell__bd">
{{ resTax }}
</view>
<view class="weui-cell__ft">元</view>
</view>
<view class="weui-cell weui-cell_input">
<view class="weui-cell__hd">
<view class="weui-label">税后工资</view>
</view>
<view class="weui-cell__bd">
{{ resAfterTax }}
</view>
<view class="weui-cell__ft">元</view>
</view>
<view class="table">
<view class="tr">
<view class="th">个人所得税税率表</view>
</view>
<view class="tr">
<view class="th th1">级数</view>
<view class="th th2">应纳税所得额</view>
<view class="th th3">税率(%)</view>
<view class="th th4">速算扣除数</view>
</view>
<block wx:for="{{taxArray}}" wx:key="level">
<view class='tr {{ item.level % 2 == 0 ? "rowColor":"" }}'>
<view class="td th1">{{item.level}}</view>
<view class="td th2">{{item.name}}</view>
<view class="td th3">{{item.rate}}</view>
<view class="td th4">{{item.deduct}}</view>
</view>
</block>
</view>
<view class="weui-footer weui-footer_fixed-bottom">
<view class="weui-footer__text">Copyright © 2019 jlc</view>
</view>
</form>2、index.wxss
.green-btn{
background-color: #a6a8aa;
color:#fff;
}
.green-hover-class{
background-color: #737577;
color:#fff;
}
.table {
border: 1px solid #ccc;
border-right: 0;
border-bottom: 0;
width: 100%;
margin-top: 20px;
margin-bottom: 50px;
}
.tr {
width: 100%;
display: flex;
justify-content: space-between;
}
.th, .td {
padding: 5px;
border-bottom: 1px solid #c2bdbd;
border-right: 1px solid #c2bdbd;
text-align: center;
width: 100%;
font-size:12px;
}
.th {
font-weight: 400;
background-color: #dadada;
}
.th1{
width:9%;
}
.th2{
width:55%;
}
.th3{
width:15%;
}
.th4{
width:21%;
}
.rowColor{
background-color: #dadada;
}
3、index.js
import WxValidate from '../../utils/WxValidate.js'
Page({
/**
* 页面的初始数据
*/
data: {
showTopTips: false,
form:{
beforeTax: 10000,//税前
insurance: 0,//五险一金
otherDeduct: 0,//附加扣除
threshold: 5000//起征点
},
taxArray: [
{ level: 1, name: '未超过3000元的部分', minTax: 0,rate:3, deduct:0 },
{ level: 2, name: '超过3000至12000元的部分', minTax: 3000,rate: 10, deduct: 210 },
{ level: 3, name: '超过12000至25000元的部分', minTax: 12000,rate: 20, deduct: 1410 },
{ level: 4, name: '超过25000至35000元的部分', minTax: 25000,rate: 25, deduct: 2660 },
{ level: 5, name: '超过35000至55000元的部分', minTax: 35000,rate: 30, deduct: 4410 },
{ level: 6, name: '超过55000至80000元的部分', minTax: 55000,rate: 35, deduct: 7160 },
{ level: 7, name: '超过80000元的部分', minTax: 80000, rate: 45, deduct: 15160 }
]
},
calTax: function () {
},
/**
* 生命周期函数--监听页面加载
*/
onLoad: function (options) {
//初始化表单
this.initValidate();
},
//验证表单字段
initValidate() {
const rules = {
beforeTax: {
required: true,
number: true
},
insurance: {
required: true,
number: true
},
otherDeduct: {
required: true,
digits: true
}
}
const messages = {
beforeTax: {
required: '请填写税前工资',
number: '请输入正确格式的税前工资'
},
insurance: {
required: '请填写五险一金',
number: '请填写正确格式的五险一金'
},
otherDeduct: {
required: '请填写附加扣除',
digits: '附加扣除只能为整数'
}
}
this.WxValidate = new WxValidate(rules, messages)
},
//报错
showMessage(error) {
/*wx.showModal({
content: error.msg,
showCancel: false,
})*/
wx.showToast({
title: error.msg,
icon: 'none',
duration: 3000
});
},
//调用验证函数
formSubmit: function (e) {
console.log('form发生了submit事件，携带的数据为：', e.detail.value)
const params = e.detail.value
//校验表单
if (!this.WxValidate.checkForm(params)) {
const error = this.WxValidate.errorList[0]
this.showMessage(error)
return false
}
var resAfterDeduct = 0;//应纳所得
var resTaxRate = 0;//税率
var resQuickDeduct = 0;//速算扣除
var resTax = 0;//应缴税款
var resAfterTax = 0;//实发工资
resAfterDeduct = params.beforeTax - params.insurance - params.otherDeduct - params.threshold;
if (resAfterDeduct < 0){
resAfterDeduct = 0;
}else{
var arr = this.data.taxArray;
var arrLength = arr.length;
for (var i = arrLength - 1; i >= 0; i--) {
if (resAfterDeduct > arr[i].minTax) {
resTaxRate = arr[i].rate;
resQuickDeduct = arr[i].deduct;
break;
}
}
resTax = resAfterDeduct * (resTaxRate / 100) - resQuickDeduct;
resAfterTax = params.beforeTax - params.insurance - resTax;
}
this.setData({
resAfterDeduct: resAfterDeduct,
resTaxRate: resTaxRate,
resQuickDeduct: resQuickDeduct,
resTax: resTax,
resAfterTax: resAfterTax
})
},
/**
* 生命周期函数--监听页面初次渲染完成
*/
onReady: function () {
},
/**
* 生命周期函数--监听页面显示
*/
onShow: function () {
},
/**
* 生命周期函数--监听页面隐藏
*/
onHide: function () {
},
/**
* 生命周期函数--监听页面卸载
*/
onUnload: function () {
},
/**
* 页面相关事件处理函数--监听用户下拉动作
*/
onPullDownRefresh: function () {
},
/**
* 页面上拉触底事件的处理函数
*/
onReachBottom: function () {
},
/**
* 用户点击右上角分享
*/
onShareAppMessage: function () {
}
})4、WxValidate.js
/**
* 表单验证
*
* @param {Object} rules 验证字段的规则
* @param {Object} messages 验证字段的提示信息
*
*/
class WxValidate {
constructor(rules = {}, messages = {}) {
Object.assign(this, {
data: {},
rules,
messages,
})
this.__init()
}
/**
* __init
*/
__init() {
this.__initMethods()
this.__initDefaults()
this.__initData()
}
/**
* 初始化数据
*/
__initData() {
this.form = {}
this.errorList = []
}
/**
* 初始化默认提示信息
*/
__initDefaults() {
this.defaults = {
messages: {
required: '这是必填字段。',
email: '请输入有效的电子邮件地址。',
tel: '请输入11位的手机号码。',
url: '请输入有效的网址。',
date: '请输入有效的日期。',
dateISO: '请输入有效的日期（ISO），例如：2009-06-23，1998/01/22。',
number: '请输入有效的数字。',
digits: '只能输入数字。',
idcard: '请输入18位的有效身份证。',
equalTo: this.formatTpl('输入值必须和 {0} 相同。'),
contains: this.formatTpl('输入值必须包含 {0}。'),
minlength: this.formatTpl('最少要输入 {0} 个字符。'),
maxlength: this.formatTpl('最多可以输入 {0} 个字符。'),
rangelength: this.formatTpl('请输入长度在 {0} 到 {1} 之间的字符。'),
min: this.formatTpl('请输入不小于 {0} 的数值。'),
max: this.formatTpl('请输入不大于 {0} 的数值。'),
range: this.formatTpl('请输入范围在 {0} 到 {1} 之间的数值。'),
}
}
}
/**
* 初始化默认验证方法
*/
__initMethods() {
const that = this
that.methods = {
/**
* 验证必填元素
*/
required(value, param) {
if (!that.depend(param)) {
return 'dependency-mismatch'
} else if (typeof value === 'number') {
value = value.toString()
} else if (typeof value === 'boolean') {
return !0
}
return value.length > 0
},
/**
* 验证电子邮箱格式
*/
email(value) {
return that.optional(value) || /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/.test(value)
},
/**
* 验证手机格式
*/
tel(value) {
return that.optional(value) || /^1[34578]\d{9}$/.test(value)
},
/**
* 验证URL格式
*/
url(value) {
return that.optional(value) || /^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})).?)(?::\d{2,5})?(?:[/?#]\S*)?$/i.test(value)
},
/**
* 验证日期格式
*/
date(value) {
return that.optional(value) || !/Invalid|NaN/.test(new Date(value).toString())
},
/**
* 验证ISO类型的日期格式
*/
dateISO(value) {
return that.optional(value) || /^\d{4}[\/\-](0?[1-9]|1[012])[\/\-](0?[1-9]|[12][0-9]|3[01])$/.test(value)
},
/**
* 验证十进制数字
*/
number(value) {
return that.optional(value) || /^(?:-?\d+|-?\d{1,3}(?:,\d{3})+)?(?:\.\d+)?$/.test(value)
},
/**
* 验证整数
*/
digits(value) {
return that.optional(value) || /^\d+$/.test(value)
},
/**
* 验证身份证号码
*/
idcard(value) {
return that.optional(value) || /^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}([0-9]|X)$/.test(value)
},
/**
* 验证两个输入框的内容是否相同
*/
equalTo(value, param) {
return that.optional(value) || value === that.data[param]
},
/**
* 验证是否包含某个值
*/
contains(value, param) {
return that.optional(value) || value.indexOf(param) >= 0
},
/**
* 验证最小长度
*/
minlength(value, param) {
return that.optional(value) || value.length >= param
},
/**
* 验证最大长度
*/
maxlength(value, param) {
return that.optional(value) || value.length <= param
},
/**
* 验证一个长度范围[min, max]
*/
rangelength(value, param) {
return that.optional(value) || (value.length >= param[0] && value.length <= param[1])
},
/**
* 验证最小值
*/
min(value, param) {
return that.optional(value) || value >= param
},
/**
* 验证最大值
*/
max(value, param) {
return that.optional(value) || value <= param
},
/**
* 验证一个值范围[min, max]
*/
range(value, param) {
return that.optional(value) || (value >= param[0] && value <= param[1])
},
}
}
/**
* 添加自定义验证方法
* @param {String} name 方法名
* @param {Function} method 函数体，接收两个参数(value, param)，value表示元素的值，param表示参数
* @param {String} message 提示信息
*/
addMethod(name, method, message) {
this.methods[name] = method
this.defaults.messages[name] = message !== undefined ? message : this.defaults.messages[name]
}
/**
* 判断验证方法是否存在
*/
isValidMethod(value) {
let methods = []
for (let method in this.methods) {
if (method && typeof this.methods[method] === 'function') {
methods.push(method)
}
}
return methods.indexOf(value) !== -1
}
/**
* 格式化提示信息模板
*/
formatTpl(source, params) {
const that = this
if (arguments.length === 1) {
return function () {
let args = Array.from(arguments)
args.unshift(source)
return that.formatTpl.apply(this, args)
}
}
if (params === undefined) {
return source
}
if (arguments.length > 2 && params.constructor !== Array) {
params = Array.from(arguments).slice(1)
}
if (params.constructor !== Array) {
params = [params]
}
params.forEach(function (n, i) {
source = source.replace(new RegExp("\\{" + i + "\\}", "g"), function () {
return n
})
})
return source
}
/**
* 判断规则依赖是否存在
*/
depend(param) {
switch (typeof param) {
case 'boolean':
param = param
break
case 'string':
param = !!param.length
break
case 'function':
param = param()
default:
param = !0
}
return param
}
/**
* 判断输入值是否为空
*/
optional(value) {
return !this.methods.required(value) && 'dependency-mismatch'
}
/**
* 获取自定义字段的提示信息
* @param {String} param 字段名
* @param {Object} rule 规则
*/
customMessage(param, rule) {
const params = this.messages[param]
const isObject = typeof params === 'object'
if (params && isObject) return params[rule.method]
}
/**
* 获取某个指定字段的提示信息
* @param {String} param 字段名
* @param {Object} rule 规则
*/
defaultMessage(param, rule) {
let message = this.customMessage(param, rule) || this.defaults.messages[rule.method]
let type = typeof message
if (type === 'undefined') {
message = `Warning: No message defined for ${rule.method}.`
} else if (type === 'function') {
message = message.call(this, rule.parameters)
}
return message
}
/**
* 缓存错误信息
* @param {String} param 字段名
* @param {Object} rule 规则
* @param {String} value 元素的值
*/
formatTplAndAdd(param, rule, value) {
let msg = this.defaultMessage(param, rule)
this.errorList.push({
param: param,
msg: msg,
value: value,
})
}
/**
* 验证某个指定字段的规则
* @param {String} param 字段名
* @param {Object} rules 规则
* @param {Object} data 需要验证的数据对象
*/
checkParam(param, rules, data) {
// 缓存数据对象
this.data = data
// 缓存字段对应的值
const value = data[param] !== null && data[param] !== undefined ? data[param] : ''
// 遍历某个指定字段的所有规则，依次验证规则，否则缓存错误信息
for (let method in rules) {
// 判断验证方法是否存在
if (this.isValidMethod(method)) {
// 缓存规则的属性及值
const rule = {
method: method,
parameters: rules[method]
}
// 调用验证方法
const result = this.methods[method](value, rule.parameters)
// 若result返回值为dependency-mismatch，则说明该字段的值为空或非必填字段
if (result === 'dependency-mismatch') {
continue
}
this.setValue(param, method, result, value)
// 判断是否通过验证，否则缓存错误信息，跳出循环
if (!result) {
this.formatTplAndAdd(param, rule, value)
break
}
}
}
}
/**
* 设置字段的默认验证值
* @param {String} param 字段名
*/
setView(param) {
this.form[param] = {
$name: param,
$valid: true,
$invalid: false,
$error: {},
$success: {},
$viewValue: ``,
}
}
/**
* 设置字段的验证值
* @param {String} param 字段名
* @param {String} method 字段的方法
* @param {Boolean} result 是否通过验证
* @param {String} value 字段的值
*/
setValue(param, method, result, value) {
const params = this.form[param]
params.$valid = result
params.$invalid = !result
params.$error[method] = !result
params.$success[method] = result
params.$viewValue = value
}
/**
* 验证所有字段的规则，返回验证是否通过
* @param {Object} data 需要验证数据对象
*/
checkForm(data) {
this.__initData()
for (let param in this.rules) {
this.setView(param)
this.checkParam(param, this.rules[param], data)
}
return this.valid()
}
/**
* 返回验证是否通过
*/
valid() {
return this.size() === 0
}
/**
* 返回错误信息的个数
*/
size() {
return this.errorList.length
}
/**
* 返回所有错误信息
*/
validationErrors() {
return this.errorList
}
}
export default WxValidate