如何在 JavaScript 中将字符串编码为 Base64? [英] How can you encode a string to Base64 in JavaScript?
问题描述
我有一个 PHP 脚本，可以将 PNG 图像编码为 Base64 字符串.
I have a PHP script that can encode a PNG image to a Base64 string.
我想用 JavaScript 做同样的事情.我知道如何打开文件，但我不确定如何进行编码.我不习惯使用二进制数据.
I'd like to do the same thing using JavaScript. I know how to open files, but I'm not sure how to do the encoding. I'm not used to working with binary data.
推荐答案
您可以使用 btoa() 和 atob() 来转换 base64 编码.
You can use btoa() and atob() to convert to and from base64 encoding.
关于这些函数接受/返回什么的评论似乎有些混乱，所以......
There appears to be some confusion in the comments regarding what these functions accept/return, so…
btoa()接受一个字符串"，其中每个字符代表一个 8 位字节——如果你传递的字符串包含不能用 8 位表示的字符，
btoa()accepts a "string" where each character represents an 8-bit byte – if you pass a string containing characters that can’t be represented in 8 bits, it will probably break. This isn’t a problem if you’re actually treating the string as a byte array, but if you’re trying to do something else then you’ll have to encode it first.
atob() 返回一个字符串"，其中每个字符代表一个 8 位字节——也就是说，它的值将介于 0 和 之间>0xff.这并不不是意味着它是 ASCII - 大概如果你正在使用这个函数，你希望使用二进制数据而不是文本.
atob() returns a "string" where each character represents an 8-bit byte – that is, its value will be between 0 and 0xff. This does not mean it’s ASCII – presumably if you’re using this function at all, you expect to be working with binary data and not text.
这里的大多数评论都过时了.您可能可以同时使用 btoa() 和 atob()，除非您支持非常过时的浏览器.
Most comments here are outdated. You can probably use both btoa() and atob(), unless you support really outdated browsers.
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