2023去水印小程序源码修复版

# base64 [](https://travis-ci.org/mathiasbynens/base64) [](https://coveralls.io/r/mathiasbynens/base64) _base64_ is a robust base64 encoder/decoder that is fully compatible with [`atob()` and `btoa()`](https://html.spec.whatwg.org/multipage/webappapis.html#atob), written in JavaScript. The base64-encoding and -decoding algorithms it uses are fully [RFC 4648](https://tools.ietf.org/html/rfc4648#section-4) compliant. ## Installation Via [npm](https://www.npmjs.com/): ```bash npm install base-64 ``` In a browser: ```html <script src="base64.js"></script> ``` In [Narwhal](http://narwhaljs.org/), [Node.js](https://nodejs.org/), and [RingoJS](http://ringojs.org/): ```js var base64 = require('base-64'); ``` In [Rhino](http://www.mozilla.org/rhino/): ```js load('base64.js'); ``` Using an AMD loader like [RequireJS](http://requirejs.org/): ```js require( { 'paths': { 'base64': 'path/to/base64' } }, ['base64'], function(base64) { console.log(base64); } ); ``` ## API ### `base64.version` A string representing the semantic version number. ### `base64.encode(input)` This function takes a byte string (the `input` parameter) and encodes it according to base64. The input data must be in the form of a string containing only characters in the range from U+0000 to U+00FF, each representing a binary byte with values `0x00` to `0xFF`. The `base64.encode()` function is designed to be fully compatible with [`btoa()` as described in the HTML Standard](https://html.spec.whatwg.org/multipage/webappapis.html#dom-windowbase64-btoa). ```js var encodedData = base64.encode(input); ``` To base64-encode any Unicode string, [encode it as UTF-8 first](https://github.com/mathiasbynens/utf8.js#utf8encodestring): ```js var base64 = require('base-64'); var utf8 = require('utf8'); var text = 'foo © bar 𝌆 baz'; var bytes = utf8.encode(text); var encoded = base64.encode(bytes); console.log(encoded); // → 'Zm9vIMKpIGJhciDwnYyGIGJheg==' ``` ### `base64.decode(input)` This function takes a base64-encoded string (the `input` parameter) and decodes it. The return value is in the form of a string containing only characters in the range from U+0000 to U+00FF, each representing a binary byte with values `0x00` to `0xFF`. The `base64.decode()` function is designed to be fully compatible with [`atob()` as described in the HTML Standard](https://html.spec.whatwg.org/multipage/webappapis.html#dom-windowbase64-atob). ```js var decodedData = base64.decode(encodedData); ``` To base64-decode UTF-8-encoded data back into a Unicode string, [UTF-8-decode it](https://github.com/mathiasbynens/utf8.js#utf8decodebytestring) after base64-decoding it: ```js var encoded = 'Zm9vIMKpIGJhciDwnYyGIGJheg=='; var bytes = base64.decode(encoded); var text = utf8.decode(bytes); console.log(text); // → 'foo © bar 𝌆 baz' ``` ## Support _base64_ is designed to work in at least Node.js v0.10.0, Narwhal 0.3.2, RingoJS 0.8-0.9, PhantomJS 1.9.0, Rhino 1.7RC4, as well as old and modern versions of Chrome, Firefox, Safari, Opera, and Internet Explorer. ## Unit tests & code coverage After cloning this repository, run `npm install` to install the dependencies needed for development and testing. You may want to install Istanbul _globally_ using `npm install istanbul -g`. Once that’s done, you can run the unit tests in Node using `npm test` or `node tests/tests.js`. To run the tests in Rhino, Ringo, Narwhal, and web browsers as well, use `grunt test`. To generate the code coverage report, use `grunt cover`. ## Author | [](https://twitter.com/mathias "Follow @mathias on Twitter") | |---| | [Mathias Bynens](https://mathiasbynens.be/) | ## License _base64_ is available under the [MIT](https://mths.be/mit) license.