btoa(), atob() 支援中文的方法
Posted on May 14th, 2014
由於 btoa 只能以英文數字等非 unicode 組合作為輸入, 所以若要支援 unicode 字元(中文), 必須用替代方法, 先將內容 escape 再 encode,
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| function utf8_to_b64( str ) { | |
| return window.btoa(encodeURIComponent( escape( str ))); | |
| } | |
| function b64_to_utf8( str ) { | |
| return unescape(decodeURIComponent(window.atob( str ))); | |
| } | |
| // Usage: | |
| utf8_to_b64('✓ à la mode'); // JTI1dTI3MTMlMjUyMCUyNUUwJTI1MjBsYSUyNTIwbW9kZQ== | |
| b64_to_utf8('JTI1dTI3MTMlMjUyMCUyNUUwJTI1MjBsYSUyNTIwbW9kZQ=='); // "✓ à la mode" | |
| utf8_to_b64('I \u2661 Unicode!'); // SSUyNTIwJTI1dTI2NjElMjUyMFVuaWNvZGUlMjUyMQ== | |
| b64_to_utf8('SSUyNTIwJTI1dTI2NjElMjUyMFVuaWNvZGUlMjUyMQ=='); // "I ♡ Unicode!" |
DEMO: [jsfiddle](http://jsfiddle.net/zrj9ydgc/)
REF: [window.btoa(MDN)](https://developer.mozilla.org/en-US/docs/Web/API/window.btoa)
