调试

Web/src/App.vue

@@ -1,5 +1,8 @@
 <template>
-  <van-config-provider :theme="theme" class="app-root">
+  <van-config-provider :theme="theme" :style="{ 
+      height: '100%',          
+      border: '2px solid red'  
+    }" class="app-root">
 <pre
   style="position:fixed; left:0; top:0; z-index:9999;
          background:rgba(0,0,0,0.7); color:#0f0;

Web/src/assets/base.css

@@ -84,3 +84,10 @@ body {
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 }
+
+
+html, body, #app {
+  margin: 0;
+  padding: 0;
+  height: 100%;
+}