微信小程序 支付功能（前端）的实现
只提供微信小程序端代码：
var app = getApp();Page({ data: {}, onLoad: function (options) { // 页面初始化 options为页面跳转所带来的参数 var that = this //登陆获取code wx.login({ success: function (res) { console.log(res.code) //获取openid that.getOpenId(res.code) } }); }, getOpenId: function (code) { var that = this; wx.request({ url: "https://api.weixin.qq.com/sns/jscode2session?appid=小程序appid&secret=小程序应用密钥&js_code=" + code + "&grant_type=authorization_code", data: {}, method: 'GET', success: function (res) { that.generateOrder(res.data.openid) }, fail: function () { // fail }, complete: function () { // complete } }) }, /**生成商户订单 */ generateOrder: function (openid) { var that = this //统一支付 wx.request({ url: '后台路径', method: 'GET', data: { gfee: '商品价钱', gname: '商品名称', openId:openid （商品价钱和商品名称根据自身需要是否传值,openid为必传） }, success: function (res) { var pay = res.data //发起支付 var timeStamp = pay[0].timeStamp; var packages = pay[0].package; var paySign = pay[0].paySign; var nonceStr = pay[0].nonceStr; var param = { "timeStamp": timeStamp, "package": packages, "paySign": paySign, "signType": "MD5", "nonceStr": nonceStr }; that.pay(param) }, }) }, /* 支付 */ pay: function (param) { console.log("支付") console.log(param) wx.requestPayment({ timeStamp: param.timeStamp, nonceStr: param.nonceStr, package: param.package, signType: param.signType, paySign: param.paySign, success: function (res) { // success wx.navigateBack({ delta: 1, // 回退前 delta(默认为1) 页面 success: function (res) { wx.showToast({ title: '支付成功', icon: 'success', duration: 2000 }) }, fail: function () { // fail }, complete: function () { // complete } }) }, fail: function (res) { // fail }, complete: function () { // complete } }) }})
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