fix websocket连接

index.html

@@ -103,7 +103,7 @@
         };
       },
       async created() {
-        const socket = new WebSocket("ws://localhost:8080/ws");
+        const socket = new WebSocket("ws://" + window.location.host + "/ws");
         socket.onmessage = event => {
           const feed = JSON.parse(event.data);
           this.feeds.push(feed);