Cannot access ‘handlerouter‘ before initialization,大概意思就是handlerouter没有初始化之前,无法执行server=http.createServer(handlerouter)

var http=require('http')
server=http.createServer(handlerouter)

const handlerouter=(req,res)=>{
    console.log(req.method)
    console.log(req.url)
}

server.listen(8000)

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ReferenceError: Cannot access ‘handlerouter‘ before initialization