uniapp小程序云开发登陆最佳实践

第一步，检查是否登录

// App.vue
<script>
    global.isLogin = function() {
        try {
            var openid = uni.getStorageSync('openid');
        } catch (e) {

        }
        if (openid === '') {
            return false
        } else {
            return {
                openid
            }
        }
    };
    export default {
        onLaunch: function() {
            console.log('App Launch')
            wx.cloud.init({
                traceUser: true
            });
        }
    }
</script>

第二步，登陆页面

// login.vue
<template>
    <view>
        <!-- #ifdef MP-WEIXIN -->
        <button class='bottom' type='primary' open-type="getUserInfo" withCredentials="true" lang="zh_CN" @getuserinfo="wxGetUserInfo">
            授权登录
        </button>
        <!-- #endif -->
    </view>
</template>
<script>
    const db = wx.cloud.database();
    export default {
        data() {
            return {}
        },
        methods: {
            wxGetUserInfo(msg) {
                console.log(msg)
                var that = this;
                if (!msg.detail.iv) {
                    uni.showToast({
                        title: '您取消了授权，登录失败',
                        icon: 'none'
                    });
                    return false
                }
                uni.showLoading({
                    title: '加载中'
                });
                uni.login({
                    provider: 'weixin',
                    success: function(loginRes) {
                        console.log(loginRes)
                        that.getOpenid(msg);
                    },
                    fail: function(r) {
                        console.log(r)
                    }
                })
            },
            getOpenid(msg) {
                var that = this;
                wx.cloud.callFunction({
                    name: 'getOpenid',
                    complete: res => {
                        console.log('云函数获取到的openid: ', res);
                        try {
                            uni.setStorageSync('openid', res.result.openId);
                        } catch (e) {
                            // error
                        }
                        that.saveToDb(msg, res.result.openId)
                    },
                });
            },
            saveToDb(msg, openid) {
                console.log(openid)
                db.collection('user').where({
                    _openid: openid
                }).get().then(res => {
                    console.log(res)
                    if (res.errMsg === 'collection.get:ok') {
                        if (res.data.length === 0) {
                            db.collection('user').add({
                                data: {
                                    ...msg.detail.userInfo,
                                    _openid: res.result.openId
                                }
                            }).then(res => {
                                console.log(res);
                            });
                        }
                        uni.hideLoading();
                        uni.showToast({
                            title: '授权成功',
                            icon: 'success'
                        });
                        setTimeout(() => {
                            uni.navigateBack();
                        }, 1500);
                    } else {}
                })

            }
        },
        onLoad() {

        }
    }
</script>