正常不需要支付的项目一般不需要做微信授权登陆，有业务需要的可以加，我这边项目中使用了微信支付功能所以需要搞个微信授权登陆

进入到登陆页面首先要执行

		onLoad(options) {
			if (options.code) {
				//alert(options.code);
				this.code = options.code;
				this.weChatLogin(options.code);
			} else {
				this.getAppId();
			}
		},

//这里执行的是有code的情况下执行微信登陆

//没有的话执行 this.getAppId()方法 this.getAppId()方法后面会介绍

通过getAppId方法请求接口获取到appid并且返回到/h5/pages/login/index?code=0313uHGa1dhPuF0PekFa1eCT2z23uHGl&state=STATE 登录页面并且获取到code

			// 获取公众号APPID
			getAppId() {
				uni.request({
					url: config.baseURL + '/api/thirdParty/weChatPay/getAppId',
					data: {
						organId: uni.getStorageSync('organId'),
					},
					method: 'GET',
					success: (res) => {
						console.log(res.data.data)
						let url = config.baseURL + "/h5/pages/login/index";
						location.href = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + res.data
							.data + "&redirect_uri=" + url +
							"&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect"
					}
				})
			},

然后页面获取到code会执行微信登陆也就是前面onLoad中的this.weChatLogin(options.code)方法并传入code

			//微信端登陆
			weChatLogin(code) {
				let that = this;
				uni.request({
					url: config.baseURL + '/api/thirdParty/weChatPay/weChatLogin',
					data: {
						code,
					},
					method: 'GET',
					success: (res) => {
						console.log("返回openid",res.data.openid);
						// that.openid = res.data.data.openid;
						if (res.data.code == 500) { //code为500是没有此用户需要注册
						    that.openid = res.data.openid;
							that.state = 1;
							//this.openid = res.data.openid;
							that.toggle('center');
						} else {
							that.openid = res.data.openid.data.openid;
							let {username} = res.data.openid.data;
							console.log("username",username)
							that.login(username,username)
						}
					}
				})
			},

我这边请求接口是执行的如果没有用户就直接让用户注册，有的话就直接让用户登陆。

			//用户登陆
			login(username, password) {
				let that = this;
				uni.request({
					url: config.baseURL + '/user/login',
					data: {
						username,
						 password,
					},
					header: {
						'Content-Type': 'application/x-www-form-urlencoded'
					},
					method: 'POST',
					success: (res) => {
						console.log("token", res.data.token);
						let loginInfo = {
							username,
							password,
						}
                        uni.setStorageSync('openid',that.openid);
						uni.setStorageSync('token', res.data.token);
						uni.setStorageSync('user', res.data.user)
						uni.setStorageSync('loginInfo', loginInfo);
						console.log(uni.getStorageSync('token'));
						//uni.navigateBack();
						app.websocket_init();
						uni.switchTab({
							//保留当前页面，跳转到应用内的某个页面
							url: '/pages/index/index'
						})
					}
				})
			},