allstar/assets/scripts/net/WeChat.js

const LoginApi = require('./LoginApi');
const ShareAction = require('../utils/ShareAction');
class WeChat {

    constructor() {
        this.wxWidth = 0;//微信小程序可用屏幕宽度
        this.wxHeight = 0;//微信小程序可用屏幕高度
        this.js_code = null;
    }

    /**
     * 检查登录态是否已失效
     * 回调函数会回传flag值（true:未失效, false:已失效）
     * @param {Function} cb 回调方法
     */
    checkLogin(cb) {
        CC_WECHATGAME && wx.checkSession({
            success () {
                //session_key 未失效
                cb && cb(true)
            },
            fail () {
                //session_key 已失效
                cb && cb(false)
            }
        })
    }
    
    /**
     * 使用存在localStorage中的登录信息进行静默登录
     * 不刷新 uid 和 token
     * @param {Function} cb 回调方法
     */
    loginStatic (cb) {
        let userStorage = cc.sys.localStorage.getItem('GlobalUser')
        if(userStorage) {
            Global.user = userStorage;
            cb && cb()
        } else {
            this.login(cb)
        }
    }

    /**
     * 调起一个新的微信登录
     * 刷新 token
     * @param {Function} cb 回调方法
     */
    login(cb) {

        this.cb = cb || function () { }

        if (!CC_WECHATGAME) {
            Global.showLoginPage = false;
            Global.user = {
                uid: 1,
                token: 'lucifer_test_token',
                nick: 'lucifer',
                avatarUrl: 'http://mpic.tiankong.com/f94/72b/f9472be4691ab43e3f6132bb8b63d00a/640.jpg',
                gender: 1
            }
            Global.channel = 'LuciferChannel';
            Global.os = 1;
            Global.ver = 1;

            this.cb();
            return;
        }

        this.isSupportInfoBtn = window.wx.createUserInfoButton ? true : false;

        window.wx.login({
            success: ({ code }) => {
                // console.log(code);
                this.js_code = code;
                //如果支持用户信息按钮
                if (this.isSupportInfoBtn) {
                    window.wx.getSetting({
                        success: (res) => {
                            // 已经授权，可以直接调用 getUserInfo 获取头像昵称
                            if (res.authSetting['scope.userInfo']) {
                                this._getUserInfo()
                            } else {
                                this._createBtn();
                            }
                        }
                    })
                } else {
                    this._getUserInfo()
                }
            }
        })

        window.wx.getSystemInfo({
            success: (res) => {
                Global.os = res.platform == "android" ? 2 : 1;
                this.wxWidth = res.windowWidth;
                this.wxHeight = res.windowHeight;
            }
        });
    }

    _getUserInfo() {
        wx.getUserInfo({
            withCredentials: true,
            success: (res) => {
                this._login(res);
            }
        })
    }

    _login(res) {
        // let loginApi = new LoginApi();
        LoginApi.login(this.js_code, res, this.cb);
    }

    /**
     * 创建一个微信环境下，获取登录信息的原生按钮
     */
    _createBtn() {
        let width = 160;
        let height = 80;
        let left = (this.wxWidth - width) / 2;
        let top = (this.wxHeight - height) / 2;

        let button = window.wx.createUserInfoButton({
            type: 'text',
            text: '点击授权',
            style: {
                left: left,
                top: top,
                width: width,
                height: height,
                backgroundColor: '#B6ABAB',
                color: '#000000',
                textAlign: 'center',
                fontSize: 16,
                lineHeight: 80,
                borderRadius: 5
            }
        })
        button.onTap((res) => {
            // console.log('res');
            // console.log(res);
            if (res.errMsg == 'getUserInfo:ok') {
                button.destroy();
                this._login(res);
            }
        })
        return button;
    }

    inviteFriend() {
        if (!CC_WECHATGAME) {
            return;
        }

        window.wx.shareAppMessage({
            title: '偷偷分享给你一个小程序，福利满满，你懂的',
            imageUrl: 'http://t2.hddhhn.com/uploads/tu/201806/9999/eae9e74ec8.jpg',
            query: 'uid=' + Global.user.uid + '&shareType=' + ShareAction.ADD_FRIEND,
        });
    }

}

module.exports = new WeChat();