app/invitationCode/index.js

// invitationCode/index.js
const app = getApp();
import util from '../utils/util.js'

Page({

	/**
	 * 页面的初始数据
	 */
	data: {
		appAssetsUrl: app.appAssetsUrl,
		bottomLeft: app.bottomLeft,
		user: {},
		name: '',
		memberphoto: '',
		inviteCode: '',
		invitationCodeImg: ''
	},

	/**
	 * 生命周期函数--监听页面加载
	 */
	onLoad: function(options) {
		let that = this;
		const user = wx.getStorageSync("USER");
		this.setData({
			name: options.name ? options.name : (user.name ? user.name : user.vipname),
			inviteCode: options.inviteCode ? options.inviteCode : user.inviteCode,
			memberphoto: options.memberphoto ? options.memberphoto : user.memberphoto,
			user
		})
		this.getCode();
		wx.setNavigationBarTitle({
		  title: options.inviteCode ? '他/她的邀请码' : '我的邀请码'
		});
	},
	downloadQR() {
		const that = this;
		wx.getSetting({ //获取权限
			success(res) {
				if (res.authSetting["scope.writePhotosAlbum"]) {
					that.sendCode();
				} else {
					wx.authorize({
						scope: "scope.writePhotosAlbum",
						success() {
							that.sendCode();
						}
					});
				}
			}
		});
	},
	//将base64图片转网络图片
	sendCode() {
		let code = this.data.invitationCodeImg;
		let qrcode = code.replace(/\. +/g, '').replace(/[\r\n]/g, '')
		/*code是指图片base64格式数据*/
		//声明文件系统
		const fs = wx.getFileSystemManager();
		//随机定义路径名称
		var times = new Date().getTime();
		var filePath = wx.env.USER_DATA_PATH + '/' + times + '.png';
		//将base64图片写入
		fs.writeFile({
			filePath,
			data: qrcode.slice(22),
			encoding: 'base64',
			success: () => {
				wx.saveImageToPhotosAlbum({
					filePath,
					success: function (res) {
						wx.showToast({
							title: '已保存图片',
							icon: 'none'
						})
					}
				});
			}
		});
	},
	/**
	 * 生命周期函数--监听页面初次渲染完成
	 */
	onReady: function() {

	},

	/**
	 * 生命周期函数--监听页面显示
	 */
	onShow: function() {

	},

	/**
	 * 生命周期函数--监听页面隐藏
	 */
	onHide: function() {

	},

	/**
	 * 生命周期函数--监听页面卸载
	 */
	onUnload: function() {

	},

	/**
	 * 页面相关事件处理函数--监听用户下拉动作
	 */
	onPullDownRefresh: function() {
		
	},

	/**
	 * 页面上拉触底事件的处理函数
	 */
	onReachBottom: function() {

	},

	/**
	 * 用户点击右上角分享
	 */
	onShareAppMessage: function() {
		this.addScore();
		return {
			title: '青雲慧小程序-邀请码分享',
			path: `/pages/login?inviteCode=${this.data.inviteCode}`
		}
	},
	//统计积分(每日小程序分享)
	addScore: function() {
		if(!util.getUserId()){
			return ;
		}
		wx.showLoading({
			title: '努力加载中...',
		})
		app._post_form('scoreStu/share', "", {
			stuId: util.getUserId()
		}, function(res) {
			if (res.code === 0) {}
		})
	},
	getCode() {
		let that = this;
		wx.showLoading({
			title: '努力加载中...',
		})
		app._post_form('create/wxaqrcode', '', {
				inviteCode: that.data.inviteCode
			},
			function(res) {
				if (res.code == 0) {
					that.setData({
						invitationCodeImg: res.data
					})
				}
			})
	},
	copyText() {
		wx.setClipboardData({
			data: this.data.user.inviteCode || '',
			success: function(res) {
				wx.showToast({
					title: '已复制邀请码',
					icon: 'none'
				})
			}
		})
	}
})