node使用socket.io产生的跨域问题

const io = require('socket.io')({cors:true});
//{cors:true}处理跨域

io.on('connection', client => {

    client.on('event', data => {
        console.log(data);
    });
    setTimeout(()=>{
        client.emit("/api/user","123")
    },5000)
    client.on('disconnect', () => {
    });
});
io.listen(8080);