JavaScript uses Btoa and Atob for Base64 transcoding and decoding

JavaScript native APIs were originally supported, Base64, but because of the limitations of the previous JavaScript, Base64 was largely useless. When the current HTML5 standard is formalized, BASE64 will have a larger transformation space, which can be implemented for HTML5 APIs such as FileReader API, drag-and-drop uploads, and even canvas,video.

Well, before saying a lot, developers need to focus on:

Let's take a look at how to use the Base64 transcoding in JavaScript

var str = ' javascript '; Window.btoa (str)/ transcoding result "amf2yxnjcmlwda=="  Window.atob ("amf2yxnjcmlwda==")// decoding result "javascript"

Two. For transcoding, the Base64 transcoding object can only be a string, so for other data there is a certain limitation, in particular, it is important to note that Unicode transcoding.

var str = "China, Chinese"window.btoa (str)

Uncaught domexception:failed to execute ' btoa ' in ' Window ': the string to be encoded contains characters outside of the L Atin1 range.

Obviously, this way is not possible, then how to let him support the Chinese character, which will use Window.encodeuricomponent and window.decodeuricomponent

var str = "China, Chinese"; Window.btoa (Window.encodeuricomponent (str))//" q2hpbmelruylqkmloemlrtqlqjglquqlrtulouilqkq= "window.decodeuricomponent (Window.atob (' Q2hpbmelruylqkmloemlrtqlqjglquqlrtulouilqkq= ')//"China, Australia"

Window.btoa (' {"Success": True, "MSG": null, "ErrorCode": 0, "data": {"MemberID": "6976462", "Canbxmoney": 0, "Bxdasset" : 3000.00, "Bxdprofit": 95.752732}} ');" Eyjzdwnjzxnzijp0cnvllcjtc2ciom51bgwsimvycm9yq29kzsi6mcwizgf0ysi6eyjtzw1izxjjzci6ijy5nzy0njiilcjjyw5cee1vbmv5ijowlcjiegrbc 3nldci6mzawmc4wmcwiynhkuhjvzml0ijo5ns43nti3mzj9fq== "Window.atob (" Eyjzdwnjzxnzijp0cnvllcjtc2ciom51bgwsimvycm9yq29kzsi6mcwizgf0ysi6eyjtzw1izxjjzci6ijy5nzy0njiilcjjyw5cee1vbmv5ijowlcjiegrbc 3nldci6mzawmc4wmcwiynhkuhjvzml0ijo5ns43nti3mzj9fq== ")" {"Success": True, "MSG": null, "ErrorCode": 0, "Data" : {"MemberID": "6976462", "Canbxmoney": 0, "Bxdasset": 3000.00, "Bxdprofit": 95.752732}} "

JavaScript uses Btoa and Atob for Base64 transcoding and decoding