小程序开发学习—2019年新个税计算器
看了官方的小程序开发指南，做了个税计算器来练手。
页面的样式主要使用了官方WeUI；表单验证用了WxValidate.js；表格的实现。
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
版权声明：本文为gdjlc原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。