微信小游戏里面开放数据域的资源加载问题，保存
VM269:1 gameThirdScriptError
wx.getFileSystemManager is not a function
TypeError: wx.getFileSystemManager is not a function
at Function.__static.wxdown (http://127.0.0.1:63435/game/open/js/code.js:21645:48)
at Function.get (http://127.0.0.1:63435/game/open/js/code.js:179:66)
at Function.MiniFileMgr.readFile (http://127.0.0.1:63435/game/open/js/code.js:21418:14)
at Loader.__proto.load (http://127.0.0.1:63435/game/open/js/code.js:22115:18)
at LoaderManager.__proto._doLoad (http://127.0.0.1:63435/game/open/js/code.js:13296:10)
at LoaderManager.__proto._next (http://127.0.0.1:63435/game/open/js/code.js:13269:26)
at LoaderManager.__proto.load (http://127.0.0.1:63435/game/open/js/code.js:13214:10)
at http://127.0.0.1:63435/game/open/js/code.js:53760:25
at http://127.0.0.1:63435/game/open/js/code.js:53582:47
at http://127.0.0.1:63435/game/open/js/code.js:53486:40
