我在 Express 服务器上有以下代码，用于读取图像并通过 api 将其发送到客户端
router.get("/file",async (req,res)=>{
const objImg = {img:null}
const result = await SELECT("...");
if(result.length>0){
var bitMap= fs.readFileSync(`./src/logosClient/${result.nombImg}`)
objImg.img=new Buffer.from(bitMap,"base64")
}
res.json(objImg)
})api数据到达如下
数据：{类型：“缓冲区”，数据：[137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 0, 0, 0, 192, 0, 0, 0, 46, 8, 6......]}
在我的 ReactJs 客户端中，我有以下代码来接收它
import React, {useEffect, useState} from 'react';
import muestra from '../../../../resources/images/muestra.png'
const Index = () => {
const [previewImg, setPreviewImg] = useState(null)
useEffect(()=>{
RunApi("/generales/file","GET",null,null).then(result=>{
if(result.img){
setPreviewImg("data:image/png;base64," …