正当我们准备试探示例时，突然....
造成这个错误有两个原因 (wepy以前的版本默认启动了Promise,自1.4.x以后需要手动开启)
1.未下载Promise
详情见启用文档：Promise
2. 小程序开启了“ES6转ES5”（可能wepy以及插件使用了ES7以及更高版本）
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