解析base64的mime和uint8Array
// { hello: 'world' }const p = parseBase64('data:application/json;base64,ewogICJoZWxsbyI6ICJ3b3JsZCIKfQ==');p.mime; // 'application/json'String.fromCodePoint(...p.uint8Array); // '{\n "hello": "world"\n}' 复制
// { hello: 'world' }const p = parseBase64('data:application/json;base64,ewogICJoZWxsbyI6ICJ3b3JsZCIKfQ==');p.mime; // 'application/json'String.fromCodePoint(...p.uint8Array); // '{\n "hello": "world"\n}'
解析base64的mime和uint8Array