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https://blog.meathill.com/tech/%e8%ae%a9%e5%be%ae%e4%bf%a1%e5%b0%8f%e7%a8%8b%e5%ba%8f%e6%94%af%e6%8c%81-es6-%e7%9a%84-promise-%e7%89%b9%e6%80%a7.html
让微信小程序支持 ES6 的 Promise 特性