正當我們准備試探示例時，突然....
造成這個錯誤有兩個原因 (wepy以前的版本默認啟動了Promise,自1.4.x以后需要手動開啟)
1.未下載Promise
詳情見啟用文檔：Promise
2. 小程序開啟了“ES6轉ES5”（可能wepy以及插件使用了ES7以及更高版本）
免責聲明！
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