flying-monkey/jsFile/base64-png.js

24 lines
617 B
JavaScript

const fsm = wx.getFileSystemManager();
const FILE_BASE_NAME = 'tmp_base64src'; //自定义文件名
function base64src(base64data, cb) {
const [, format, bodyData] = /data:image\/(\w+);base64,(.*)/.exec(base64data) || [];
if (!format) {
return (new Error('ERROR_BASE64SRC_PARSE'));
}
const filePath = `${wx.env.USER_DATA_PATH}/${FILE_BASE_NAME}.${format}`;
const buffer = wx.base64ToArrayBuffer(bodyData);
fsm.writeFile({
filePath,
data: buffer,
encoding: 'binary',
success() {
cb(filePath);
},
fail() {
return (new Error('ERROR_BASE64SRC_WRITE'));
},
});
};
module.exports = base64src;