微信小程序代码片段

普通页面模版

var app = getApp();
var that;

Page({
  data: {

  },

  onLoad(options) {
    that = this;

  },

  onReady() {
    that = this;
  },

  onShareAppMessage() {

  },

  onShareTimeline() {

  },
})

导航
wxml

<view class="nav">
  <navigator open-type="navigateBack" hover-class="none">
    <image src="/imgs/back.png" mode="" />
  navigator>
  详情
view>

wxss

.nav {
  height: 88rpx;
  line-height: 88rpx;
  padding-top: 88rpx;
  color: #ffffff;
  background:
    linear-gradient(-90deg, #fd874c 0%, #c81b1b 100%),
    linear-gradient(#530b0c, #530b0c);
  text-align: center;
  position: relative;
}

.nav navigator {
  display: flex;
  position: absolute;
  left: 0;
  bottom: -8rpx;
}

.nav navigator image {
  width: 44rpx;
  height: 44rpx;
  margin: 30rpx;
}

流加载JS

Page({
  data: {
    p: 1, //页数
    flow: true, //是否完成加载
    loaded: true, //是否加载中
  },

  onLoad(options) {
    that = this;

    that.to_load();
  },

  onReady() {
    that = this;
  },

  onReachBottom() {
    var flow = that.data.flow;
    var loaded = that.data.loaded;
    if (!flow || !loaded) {
      return false;
    }

    var p = that.data.p;
    p++; //页数自增1
    that.setData({
      p: p,
    });

    that.to_load(); //调用加载方法
  },

  // 分享
  onShareAppMessage() {

  },

  // 分享
  onShareTimeline() {

  },

  to_load: function () {
    var p = that.data.p;
    that.setData({
      loaded: false,
    });
    app.request_api("/lists", {
      p: p,
    }, function (params) {
      var list = that.data.lists;
      var lists = params.lists;
      if (p == 1) {
        list = [];
      }
      if (!lists || typeof (lists) != "object") {
        lists = [];
      }
      list = list.concat(lists); //concat连接数组
      var flow = true;
      if (list.length == params.len) {
        flow = false;
      }
      that.setData({
        lists: list,
        flow: flow,
        loaded: true,
      });
    });
  },
})

onReachBottom页面滚动到底部执行的方法
官方文档https://developers.weixin.qq.com/miniprogram/dev/reference/api/Page.html#onReachBottom

app.js

var app;
var that;

App({
  onLaunch(e) {
    app = that = this;

    if (e.path.indexOf("/index/index") === -1) {
      app.to_login();
    }

    app.update();
    app.g_share();
  },

  // 自动更新
  update: function () {
    if (wx.canIUse && wx.canIUse("getUpdateManager")) {
      try {
        var udmgr = wx.getUpdateManager();
        udmgr.onCheckForUpdate(function (params) {
          // 请求完新版本信息的回调
          if (params.hasUpdate) {
            udmgr.onUpdateReady(function () {
              wx.showModal({
                title: "更新提示",
                content: "新版本已经准备好，是否重启应用？",
                success: function (params2) {
                  if (params2.confirm) {
                    // 新的版本已经下载好，调用applyUpdate应用新版本并重启
                    udmgr.applyUpdate();
                  }
                },
              });
            });

            udmgr.onUpdateFailed(function () {
              // 新的版本下载失败
              wx.showModal({
                title: "已经有新版本了哟~",
                content: "新版本已经上线啦~，请您删除当前小程序，重新搜索打开哟~",
              });
            });
          }
        });

      } catch (error) {
        console.warn(error);
      }
    } else {
      // 此时微信版本太低（一般而言版本都是支持的）
      wx.showModal({
        title: "溫馨提示",
        content: "当前微信版本过低，无法使用该功能，请升级到最新微信版本后重试。",
      });
    }
  },

  // 重写分享方法
  // 需要页面JS存在对应的空方法,否则没有效果
  g_share: function () {
    // 间接实现全局设置分享内容
    wx.onAppRoute(function (params) {
      // console.log(params);
      // 获取加载的页面
      var pages = getCurrentPages();
      // 获取当前页面的对象
      var view = pages[pages.length - 1];
      if (view) {
        var data = view.data;
        if (!data.is_over_share) {
          data.is_over_share = true;
          view.onShareAppMessage = app.to_share_msg;
          view.onShareTimeline = app.to_share_tl;
          console.log("全局分享");
        }
      }
    });
  },
  // 重写分享方法
  to_share_msg: function () {
    // 重写分享配置
    return {
      title: "test",
      path: "/pages/index/index",
      // imageUrl: app.globalData.s_img,
    };
  },
  // 重写分享方法
  to_share_tl: function () {
    // 重写分享配置
    return {
      title: "test",
      query: "g_share=tl",
    };
  },

  // openid
  to_login: function (callback = false) {
    wx.login({
      success: function (params) {
        if (params.code) {
          app.request_api(
            "/index/base/login",
            {
              code: params.code,
            },
            function (params2) {
              app.globalData.openid = params2.openid;
              app.globalData.wid = params2.wid;
              if (callback != false) {
                callback();
              }
            }
          );
        }
      },
    });
  },

  // 请求接口
  request_api: function (action, data = {}, callback = false) {
    var show_l = false;
    var timer_l = setTimeout(() => {
      show_l = true;
      wx.showLoading({
        title: "加载中...",
        mask: true,
      });
    }, 1500);

    var url = app.globalData.api_url + action;
    url = url.replace(/\?$/isg, "");
    if (typeof (data.p) != "undefined")
      url += (url.indexOf("?") === -1 ? "?" : "&") + "p=" + data.p;
    data.wid = app.globalData.wid;

    wx.request({
      url: url,
      method: "POST",
      data: data,
      dataType: "json",
      timeout: 6000000,
      header: {
        "Content-Type": "application/x-www-form-urlencoded",
        "Cookie": "session_id",
        "X-Requested-With": "XMLHttpRequest",
      },
      success: function (params) {
        clearTimeout(timer_l);
        if (show_l) {
          wx.hideLoading();
        }
        if (callback != false) {
          callback(params.data);
        }
      },
    });
  },

  globalData: {
    api_url: "http://test.cc",
    openid: 0,
    wid: 0,
    uid: 0,
  },
});

PHP

namespace app\index\controller;

use think\Controller;
use think\Db;

class Base extends Controller
{
	public $app_id = "***";
	public $app_secret = "***";

	// openid
	public function login($code = "")
	{
		$times = time();

		$code = trim($code);
		if (empty($code)) {
			$res["msg"] = "need code";
			$res["code"] = 1;
			return json($res);
		}

		$res["msg"] = "has code";
		$res["code"] = 1;

		$param["appid"] = $this->app_id;
		$param["secret"] = $this->app_secret;
		$param["js_code"] = $code;
		$param["grant_type"] = "authorization_code";
		$param = http_build_query($param);
		$url = "https://api.weixin.qq.com/sns/jscode2session?" . $param;
		$response_raw = file_get_contents($url);
		$response = json_decode($response_raw, true);

		$openid = !empty($response["openid"]) ? $response["openid"] : "";
		$session_key = !empty($response["session_key"]) ? $response["session_key"] : "";
		$errcode = !empty($response["errcode"]) ? $response["errcode"] : "";

		if (!$openid) {
			$res["code"] = 1;
			$res = (array)$res + $response;
			return json($res);
		}

		if ($errcode == 40029) {
			$res["msg"] = "invalid code";
			$res["errcode"] = $errcode;
			$res["code"] = 1;
		} else if ($openid) {
			$info = Db::name("wechat")
				->field(["session_key"], true)
				->where("open_id", $openid)
				->find();

			$data_db["update_time"] = $times;
			// $data_db["session_key"] = $session_key;

			if (!empty($info["id"])) {
				Db::name("wechat")->where("open_id", $info["open_id"])->update($data_db);
				$wid = Db::name("wechat")->where("open_id", $info["open_id"])->value("id");

				$res["msg"] = "exist";
				$res["openid"] = $openid;
				$res["wid"] = $wid;
				$res["code"] = 0;
			} else {
				$data_db["open_id"] = $openid;
				$data_db["status"] = 1;
				$data_db["create_time"] = $times;
				$wid = Db::name("wechat")->insertGetId($data_db);

				$res["msg"] = "not exist";
				$res["openid"] = $openid;
				$res["wid"] = $wid;
				$res["code"] = 0;
			}
		}

		return json($res);
	}

	// 上传
	public function upload()
	{
		set_time_limit(0);
		ini_set("max_execution_time", 0);
		ini_set("memory_limit", -1);

		$name = trim(input("name")); //获取文件名
		$file = request()->file("file"); //获取上传的文件
		if (!$file) {
			$res["msg"] = "文件大小超限";
			$res["code"] = 1;
			return json($res);
		}

		$file->checkSize(20000000); //限制大小
		$file->checkMime(explode("|", "xls|xlsx")); //限制后缀

		$path_ul = "./Uploads/file/"; //移动到框架应用根目录/public/Uploads/目录下
		$info = $file->move($path_ul);
		if (!$info) {
			$res["msg"] = $file->getError();
			$res["code"] = 1;
			return json($res);
		}

		if (!$name) {
			$name = $info->getInfo("name"); //获取原始文件名
		}

		$path = $info->getSaveName();
		$path = str_replace("\\", "/", $path); //\(反斜杠)替换为/(斜杠)
		$path = ltrim($path_ul, ".") . ltrim($path, "/");
		$urls = request()->domain() . $path;

		$res = [];
		$res["name"] = $name;
		$res["path"] = $path;
		$res["urls"] = $urls;
		$res["field"] = $path . "|" . $name;
		$res["code"] = 0;
		return json($res);
	}
}