socket.io的跨域问题

Question

前端代码 使用vue书写 端口号8081

<script>
      
        var socket = io('http://192.168.XX.XXX:2121');
      
        uid = 123;
        // socket连接后以uid登录
        socket.on('connect', function(){
            //socket.emit('login', uid);
            alert('链接成功');
        });
        // 后端推送来消息时
        socket.on('new_msg', function(msg){
            console.log("收到消息："+msg);
        });
    
    </script>

Failed to load http://192.168.XX.XXX:2121/socket.io/?EIO=3&transport=polling&t=MxKjFKL: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8081' is therefore not allowed access.

是否是因为跨域问题
但是如果是跨域问题
使用了这两句话
仍然无效

 header('Access-Control-Allow-Origin:*');//允许所有来源访问
        header('Access-Control-Allow-Method:POST,GET');//允许访问的方式 　　

Answer 1

请问解决了嘛