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## 微信支付 框架集成了微信支付的业务逻辑,只需要按照我案例演示的流程执行,就可轻松实现。免去了阅读大篇幅的原文档,而且还会遇坑的风险。 <br> ### 微信内调起支付 ``` // 1. 前端通过 pnpm 安装 weixin-jsapi pnpm install weixin-jsapi import wx from 'weixin-jsapi' ``` ``` // 2. 通过静默授权回调的方式拿到code // 重定向 goRedirect(isForce = false){ let code = this.getQueryString('code') if(!code || isForce){ const appid = 'wx520c63a7a02b8859' const redirect_uri = encodeURIComponent('http://h5pay.zhangyubk.com') window.location.replace(`https://open.weixin.qq.com/connect/oauth2/authorize?appid=${appid}&redirect_uri=${redirect_uri}&response_type=code&scope=snsapi_base&state=STATE#wechat_redirect`) } } ``` ``` // 3. 动态获取当前网址并去后端换取载入jssdk的配置参数 // 载入jssdk // jssdk不只可以用来做支付,微信公众号网页开发内的所有功能都可使用 initJsSdk(){ let url = window.location.href this.$api.jssdk({url: url.split("#")[0]}).then(result => { wx.config(result.data) }) } ``` ``` // 4. 后端获取 ACCESS_TOKEN 换取 TICKET 然后组装成配置参数 // 获取ACCESS_TOKEN async getAccessToken() { // 判断缓存里是否有ACCESS_TOKEN const ACCESS_TOKEN = await this.RDb().get('THINKJS_ACCESS_TOKEN') if (ACCESS_TOKEN) { return ACCESS_TOKEN } else { const url = `https: //api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=${wxConfig.wechat.appid}&secret=${wxConfig.wechat.secret}` const result = await this.Fetch({ url }) this.RDb().set('THINKJS_ACCESS_TOKEN', result.access_token, 7200) return result.access_token } } // 获取JSAPI_TICKET async getJsapiTicket() { // 判断缓存里是否有JSAPI_TICKET const JSAPI_TICKET = await this.RDb().get('THINKJS_JSAPI_TICKET') const ACCESS_TOKEN = await this.getAccessToken() if (JSAPI_TICKET) { return JSAPI_TICKET } else { const url = `https: //api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=${ACCESS_TOKEN}&type=jsapi` const result = await this.Fetch({ url }) this.RDb().set('THINKJS_JSAPI_TICKET', result.ticket, 7200) return result.ticket } } // 获取js-sdk注入的配置信息 async getJsSdkConfig(url) { let obj = { jsapi_ticket: await this.getJsapiTicket(), nonceStr: this.Utils.getNonceStr(32), timestamp: String(Math.floor(Date.now() / 1000)), url } let str = this.Utils.raw(obj) obj.signature = this.Utils.sha1(str) obj.appId = wxConfig.wechat.appid obj.jsApiList = ['chooseWXPay'] obj.debug = false delete obj.url return obj } ``` ``` // 5. 用CODE换取调取支付台所需参数 let code = this.getQueryString('code') this.$api.wxpay({ code }).then(result = >{ wx.ready(() = >{ wx.chooseWXPay({...result.data, timestamp: result.data.timeStamp, success: () = >{ // 支付成 }, cancel: () = >{ // 取消支付 }, fail: (e) = >{ // 支付失败 console.log(e) } }) }) }) ``` ``` // 6. 后台返回支付台所需参数 // 获取支付台所需参数 async getWxPayConfig(code) { // 获取openid let url = `https: //api.weixin.qq.com/sns/oauth2/access_token?appid=${wxConfig.wechat.appid}&secret=${wxConfig.wechat.secret}&code=${code}&grant_type=authorization_code` let result = await this.Fetch({ url }) let prepay_id = await this.getPrepayId(result.openid) let obj = { appId: wxConfig.wechat.appid, timeStamp: String(Math.floor(Date.now() / 1000)), nonceStr: this.Utils.getNonceStr(32), package: `prepay_id = $ { prepay_id }`, signType: 'RSA' } let str = `$ { obj.appId }\n$ { obj.timeStamp }\n$ { obj.nonceStr }\n$ { obj.package }\n`obj.paySign = this.Utils.rsaSign(str, wxConfig.wechat.private_key) return obj } // 微信内支付获取prepay_id async getPrepayId(openid) { let result = await this.WxPay().jsapi({ description: 'ThinkJS实战', // 商品描述 out_trade_no: this.Utils.orderCode(), // 商户订单号 amount: { total: 100, // 总金额 currency: 'CNY' // 人民币 }, payer: { openid } }) if (result.status == 200) { return JSON.parse(result.data).prepay_id } else { return null } } ``` ### 微信外H5调起支付 ``` // 前端部分 this.$api.h5pay().then(result => { window.location.replace(result.data.h5_url) }) ``` ``` // 后端部分 // 微信外支付获取跳转链接 async getPayUrl(ctx) { let result = await this.WxPay().h5({ description: 'ThinkJS实战', // 商品描述 out_trade_no: this.Utils.orderCode(), // 商户订单号 amount: { total: 100, // 总金额 currency: 'CNY' // 人民币 }, scene_info: { payer_client_ip: this.Utils.getIP(ctx), // 用户终端IP h5_info: { type: 'Wap' // 场景类型 } } }) if (result.status == 200) { return JSON.parse(result.data) } else { return null } } ``` > 微信支付文档:https://pay.weixin.qq.com/wiki/doc/apiv3/index.shtml > 公众号网页开发:https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_webpage_authorization.html > wxpay-v3文档:https://www.npmjs.com/package/wxpay-v3