I have bug in base64Source decode

[mason276752]

I "encode" that

// get iframe
var Base64 = require('js-base64').Base64;
var code = Base64.encode(
`console.log(1)
`)

var iframe = `<iframe src="https://runkit.com/e?base64source=${code}" frameborder="0" style="width: 100%;"></iframe>`
var textarea = iframe + "<textarea>" + iframe + "</textarea>"

It's Base64 code is

Ly8gZ2V0IGlmcmFtZQp2YXIgQmFzZTY0ID0gcmVxdWlyZSgnanMtYmFzZTY0JykuQmFzZTY0Owp2YXIgY29kZSA9IEJhc2U2NC5lbmNvZGUoCmBjb25zb2xlLmxvZygxKQpgKQoKdmFyIGlmcmFtZSA9IGA8aWZyYW1lIHNyYz0iaHR0cHM6Ly9ydW5raXQuY29tL2U/YmFzZTY0c291cmNlPSR7Y29kZX0iIGZyYW1lYm9yZGVyPSIwIiBzdHlsZT0id2lkdGg6IDEwMCU7Ij48L2lmcmFtZT5gCnZhciB0ZXh0YXJlYSA9IGlmcmFtZSArICI8dGV4dGFyZWE+IiArIGlmcmFtZSArICI8L3RleHRhcmVhPiI=

Now
We can put base64 code in <iframe>

<iframe src="https://runkit.com/e?base64source=Ly8gZ2V0IGlmcmFtZQp2YXIgQmFzZTY0ID0gcmVxdWlyZSgnanMtYmFzZTY0JykuQmFzZTY0Owp2YXIgY29kZSA9IEJhc2U2NC5lbmNvZGUoCmBjb25zb2xlLmxvZygxKQpgKQoKdmFyIGlmcmFtZSA9IGA8aWZyYW1lIHNyYz0iaHR0cHM6Ly9ydW5raXQuY29tL2U/YmFzZTY0c291cmNlPSR7Y29kZX0iIGZyYW1lYm9yZGVyPSIwIiBzdHlsZT0id2lkdGg6IDEwMCU7Ij48L2lmcmFtZT5gCnZhciB0ZXh0YXJlYSA9IGlmcmFtZSArICI8dGV4dGFyZWE+IiArIGlmcmFtZSArICI8L3RleHRhcmVhPiI=" frameborder="0" style="width: 100%;"></iframe>

Boom!! What is happen?

We can check the base64 code

look it is so good, no problem.

But, It put "https://runkit.com/e?base64source=" not good.

[mason276752]

Base64 code have '+' or '=' symbol, use encodeURIComponent(code) fix the problem.

Help me close the issue. Thx