代码如下： // 云函数入口函数 exports.main = async (event, context) => {   console.log("event = ", event)   let {     param1   } = event   console.log("0000000000000=", param1)   //1，通过fileID下载云存储里的excel文件   const res = await cloud.downloadFile({     fileID: param1,   }) ...... } 错误如下： [info] 函数被触发，正在执行中... index.js:13 event =  {param1: "cloud://ztzgr-pms-c-fq4yo.7a74-ztzgr-pms-c-fq4yo-1301995773/HRCost.xls"}param1: "cloud://ztzgr-pms-c-fq4yo.7a74-ztzgr-pms-c-fq4yo-1301995773/HRCost.xls"__proto__: Object index.js:17 0000000000000= cloud://ztzgr-pms-c-fq4yo.7a74-ztzgr-pms-c-fq4yo-1301995773/HRCost.xls node.js:1 [error] 函数执行失败（耗时 257ms） Error: errCode: -1 unknown error | errMsg: downloadFile:fail TypeError: Cannot read property '0' of undefined; at downloadFile api;      at returnAsCloudSDKError (E:\0.GIT\ProjectManager\微信项目费用管理\cloudfunctions\excel\node_modules\wx-server-sdk\index.js:6027:16)     at Object.returnAsFinalCloudSDKError (E:\0.GIT\ProjectManager\微信项目费用管理\cloudfunctions\excel\node_modules\wx-server-sdk\index.js:6041:15)     at E:\0.GIT\ProjectManager\微信项目费用管理\cloudfunctions\excel\node_modules\wx-server-sdk\index.js:2419:39     at processTicksAndRejections (internal/process/task_queues.js:85:5) _ @ node.js:1 u @ node.js:1 processTicksAndRejections @ internal/process/task_queues.js:85 Promise.catch (async) (anonymous) @ node.js:1 emit @ events.js:208 endReadableNT @ _stream_readable.js:1154 processTicksAndRejections @ internal/process/task_queues.js:77 TickObject (async) init @ internal/inspector_async_hook.js:21 emitInitNative @ internal/async_hooks.js:134 emitInitScript @ internal/async_hooks.js:341 TickObject @ internal/process/task_queues.js:102 nextTick @ internal/process/task_queues.js:130 endReadable @ _stream_readable.js:1143 Readable.read @ _stream_readable.js:425 flow @ _stream_readable.js:977 emitReadable_ @ _stream_readable.js:572 onEofChunk @ _stream_readable.js:536 readableAddChunk @ _stream_readable.js:243 Readable.push @ _stream_readable.js:210 parserOnMessageComplete @ _http_common.js:150 HTTPINCOMINGMESSAGE (async) init @ internal/inspector_async_hook.js:21 emitInitNative @ internal/async_hooks.js:134 connectionListenerInternal @ _http_server.js:366 defaultTriggerAsyncIdScope @ internal/async_hooks.js:301 connectionListener @ _http_server.js:339 emit @ events.js:203 onconnection @ net.js:1473 node.js:1 [info] 调用 本地 云函数 'excel' 完成  （耗时 284ms）