uniapp实现文件复制移动

moveDirecty(oldPath) {
                const newLocalPath = '_doc'
                plus.io.resolveLocalFileSystemURL(newLocalPath, function(entry1) {
                    plus.io.resolveLocalFileSystemURL(oldPath, function(entry2) {
                        uni.removeSavedFile({
                            filePath: DB.dbPath,
                            success: function() {
                                console.log('文件删除成功！')
                                entry2.moveTo(entry1, '', function(res) {
                                    console.log('移动成功', JSON.stringify(res))
                                }, function(e) {
                                    console.log('内层移动失败' + JSON.stringify(
                                        e))
                                })
                            }
                        })
                    }, function(e) {
                        console.log('移动失败' + JSON.stringify(e))
                    })
                }, function(e) {
                    console.log('外层操作失败' + JSON.stringify(e))
                })
            }