uni 微信小程序、QQ小程序base64转换图片

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base64Save(base64File){        const fsm = uni.getFileSystemManager();//获取全局文件管理器                         let extName = base64File.match(/data\:\S+\/(\S+);/)            if (extName) {                //获取文件后缀                extName = extName[1]            }                         //获取自1970到现在的毫秒 + 文件后缀 生成文件名            let fileName = Date.now() + '.' + extName                         return new Promise((resolve, reject) => {                //写入文件的路径                let filePath = wx.env.USER_DATA_PATH + '/' + fileName                                 fsm.writeFile({                    filePath,                    data: base64File.replace(/^data:\S+\/\S+;base64,/, ''),                    encoding: 'base64',                    success:(res)=>{                        console.log('filePath',filePath);                        resolve(filePath);                    },                    fail() {                        reject('写入失败');                    },                });            });        },

　　使用

this.base64Save(this.qr).then(res=>{
               console.log(res)
              })