在 MognoDB 中保存影像檔案時遇到問題。它在說錯誤
（節點：14849）UnhandledPromiseRejectionWarning：錯誤 [ERR_HTTP_HEADERS_SENT]：在將標頭發送到客戶端后無法設定標頭
當我搜索錯誤解決方案時，據說我在發送結果后發送結果。我正在檢查我的代碼，它不是那樣的。任何人都可以幫我找到錯誤嗎？
圖片上傳.js
const multer = require("multer");
const uploadImage = require("../../models/fileUpload");
const Storage = multer.diskStorage({
destination: "uploads",
filename: function (req, file, cb) {
const uniqueSuffix = Date.now() "-" Math.round(Math.random() * 1e9);
cb(null, file.fieldname "-" uniqueSuffix);
},
});
const upload = multer({
storage: Storage,
limits: {
fileSize: 1024 * 1024 * 5,
},
}).single("testImage");
const imageUpload = async (req, res) => {
try {
upload(req, res, (err) => {
if (err)
res.status(400).json({
success: false,
message: "Saving Failed",
});
const newImage = new uploadImage({
name: req.body.name,
image: {
data: req.body.image,
contentType: "image/png",
},
});
newImage
.save()
.then(() => {
res.status(201).json({
success: true,
msg: "Saved Successfully",
});
})
.catch((error) => {
res.status(500).json({
success: false,
msg: error.data,
});
});
});
} catch (err) {
console.log(err);
}
};
module.exports = { imageUpload };
uj5u.com熱心網友回復：
在向客戶端發送回應之前回傳在您發送的每個回應之前添加回傳它會修復錯誤，也是一個好習慣
uj5u.com熱心網友回復：
我無法用 else正確定義if條件。
下面是重寫的代碼。
圖片上傳.js
const multer = require("multer");
const uploadImage = require("../../models/fileUpload");
// const Storage = multer.diskStorage({
// destination: "uploads",
// filename: function (req, file, cb) {
// const uniqueSuffix = Date.now() "-" Math.round(Math.random() * 1e9);
// cb(null, file.fieldname "-" uniqueSuffix);
// },
// });
const upload = multer({
// storage: Storage,
limits: {
fileSize: 1024 * 1024 * 5,
},
}).single("testImage");
const imageUpload = async (req, res) => {
try {
upload(req, res, (err) => {
if (err) {
res.status(400).json({
success: false,
message: "Saving Failed",
});
} else {
const newImage = new uploadImage({
name: req.body.name,
image: {
data: req.body.image,
contentType: "image/png",
},
});
newImage
.save()
.then(() => {
res.status(201).json({
success: true,
msg: "Saved Successfully",
});
})
.catch((error) => {
res.status(500).json({
success: false,
msg: error.data,
});
});
}
});
} catch (err) {
console.log(err);
}
};
module.exports = { imageUpload };
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標籤：javascript 节点.js mongodb 后端
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