适合用微信小程序、字节跳动小程序。

1.非app.js的页面:

var app = getApp();

app.globalData.userName = "xxx";

2.app.js:

在onLaunch函数中:

注意,var that = this;必须写在onlaunch()开始

onLaunch: function () {

var that = this;

that.globalData.userName = "xxx";

},