广告无法接入，直接报异常：

Uncaught TypeError: wx.createBannerAd is not a function

    at main.js:7

    at require (WAGame.js:3)

    at WAGame.js:3

    at game.js? [sm]:4

    at require (WAGame.js:3)

    at <anonymous>:1:1

    at HTMLScriptElement.scriptLoaded (<anonymous>:18:21)

    at HTMLScriptElement.script.onload (<anonymous>:30:20)