recruitment-wechat-uniapp-241012/utils/wxBase64src.js

const fsm = wx.getFileSystemManager();
const FILE_BASE_NAME = 'tmp_base64src';

const base64src = function(base64data) {
	return new Promise((resolve, reject) => {
		const [, format, bodyData] = /data:image\/(\w+);base64,(.*)/.exec(base64data) || [];
		if (!format) {
			reject(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() {
				resolve(filePath);
			},
			fail() {
				reject(new Error('ERROR_BASE64SRC_WRITE'));
			},
		});
	});
};

export default {
	base64src,
};