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const express = require("express") const app = express() const port = 5000 let count = 0 app.all("*",function(req,res,next){ // //设置允许跨域的域名，*代表允许任意域名跨域 res.header("Access-Control-Allow-Origin",req.header.origin||"*") //允许的header类型 res.header("Ac