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‘Promise’ is undefined #IE11

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二05 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

‘Promise’ is undefined #IE11

javascript promises are a key feature of modern asyncronous javascript, but, if you’re developing a mass-market website, cross-browser support may trump the syntactical sugar, especially if you’re facing down business-types, rather than other developers.

Specifically, IE11 does not support Javascript promises, and if you are looking to support a wide range of browsers, then there is a polyfill available from Taylor Hakes, that can get round that error message, that simply says “ ‘Promise’ is undefined ” in IE11

So, working with an example from SMTPJS v3 which now uses promises, and arrow functions, you need include the following script tags;

https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js

https://smtpjs.com/v3/smtp.js

Then adjust the code to use an inline function instead of an arrow function:

Email.send({ Host : “email-smtp.eu-west-1.amazonaws.com”, Username : “******”, Password : “*****”, To : ‘them@gmail.com’, From : “you@website.com”, Subject : “This is the subject”, Body : “My useragent is ” + navigator.userAgent }).then( function(message) { alert(message) } // FOR IE );

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