fix: 无法在登录时切换服务器

ling_chair_http/index.html

@@ -170,7 +170,7 @@
           <i class="mdui-icon material-icons">cloud_circle</i>
           <label class="mdui-textfield-label">服务器地址</label>
           <input n-id="dialogSignInServer" class="mdui-textfield-input" type="text" placeholder="留空以使用网页所在地址"
-            n-input-ls="server" onblur="" />
+            n-input-ls="server" n-id="dialogSignServer" onblur="setupClient(viewBinding.dialogSignServer.val())" />
         </div>
         <div class="mdui-textfield">
           <i class="mdui-icon material-icons">account_circle</i>

ling_chair_http/index.js

@@ -691,7 +691,7 @@ if (!localStorage.refreshToken || localStorage.refreshToken === "")
 
 let client
 function setUpClient(server) {
-    if (server)
+    if (server && server !== "")
         client = new io(server, {
             auth: {
                 name: localStorage.isSignIn === "false" ? null : localStorage.userName