diff --git a/src/App.vue b/src/App.vue
index 6518085..594e46b 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -16,7 +16,7 @@ const worldRef = ref<HTMLDivElement | null>(null)
 const showAI = ref(true)
 
 const state = reactive({
-  scale: 1,
+  scale: 0.8,
   minScale: 0.2,
   maxScale: 3,
   translateX: 0,
@@ -128,7 +128,8 @@ function onCanvasDrop(e: DragEvent) {
   const props: Record<string, number | string> = {}
     ; (item.propertySchemas || []).forEach((p) => { props[p.key] = p.default })
   const inst: Instance = { id: String(++idSeq), key: item.key, url: item.url, x: x, y: y, size: defSize, rotation: 0, props }
-  if (item.stateImages) inst.state = 'off'
+  // 仍保留 state 字段用于灯泡等展示，但对于开关用 props.state 作为真值
+  if (item.stateImages) inst.state = String(props['state'] ?? 'off') as any
   instances.push(inst)
 }
 
@@ -447,7 +448,7 @@ function buildNet(): BuiltNet {
     const n1 = getNode(inst, 1)
 
     const key = meta.key
-    if (key === 'battery') {
+  if (key === 'battery') {
       const V = safeNum(inst.props?.['voltage'], 0)
       const Rint = safeNum(inst.props?.['internalResistance'], 0.1)
       // 用内部节点将电压源与内阻串联：n0 --[V]--> nInt --[Rint]--> n1
@@ -464,7 +465,8 @@ function buildNet(): BuiltNet {
       vsrcs.push({ inst, nPlus: n0, nMinus: nInt, V })
       resistors.push({ inst, nPlus: nInt, nMinus: n1, R: Math.max(1e-9, Rint) })
     } else if (key === 'switch') {
-      if (inst.state === 'on') {
+      const sw = (inst.props?.['state'] as any) === 'on' || inst.state === 'on'
+      if (sw) {
         vsrcs.push({ inst, nPlus: n0, nMinus: n1, V: 0 })
       }
       // off = open, 忽略
@@ -820,6 +822,13 @@ function loadFromJSONText(text: string) {
       rotation: safeNumber(r.rotation, 0),
       props: rawProps,
       state: r.state === 'on' || r.state === 'off' ? r.state : undefined,
+    }
+    // 兼容老文件：若为开关且 props.state 缺失，则使用 legacy state 或默认 off
+    if (inst.key === 'switch') {
+      const cur = String((inst.props as any)['state'] ?? '')
+      if (cur !== 'on' && cur !== 'off') {
+        (inst.props as any)['state'] = (inst.state === 'on' ? 'on' : 'off')
+      }
     }
       // 暂存连接信息在实例对象上（不入 props）以便后续重建导线
       ; (inst as any).__savedConnections = savedConnections
@@ -951,10 +960,10 @@ function deleteSelected() {
     </aside>
 
     <!-- 画布视口（可平移、缩放、接收拖拽） -->
-    <main class="viewport" ref="viewportRef" @mousedown="onViewportMouseDown"
-      @mousemove="(e) => { onViewportMouseMove(e); onViewportMouseMoveDrag(e); onViewportMouseMoveTrack(e); onViewportMouseMoveSlider(e) }"
-      @mouseup="() => { onViewportMouseUp(); onViewportMouseUpDrag(); onViewportMouseUpSlider() }"
-      @mouseleave="() => { onViewportMouseUp(); onViewportMouseUpDrag(); onViewportMouseUpSlider() }" @wheel="onWheel"
+    <main class="viewport" ref="viewportRef" @pointerdown="onViewportMouseDown"
+      @pointermove="(e) => { onViewportMouseMove(e); onViewportMouseMoveDrag(e); onViewportMouseMoveTrack(e); onViewportMouseMoveSlider(e) }"
+      @pointerup="() => { onViewportMouseUp(); onViewportMouseUpDrag(); onViewportMouseUpSlider() }"
+      @pointerleave="() => { onViewportMouseUp(); onViewportMouseUpDrag(); onViewportMouseUpSlider() }" @wheel="onWheel"
       @dragover="onCanvasDragOver" @drop="onCanvasDrop" @click="clearSelection">
       <!-- 世界平面：网格背景，应用 transform -->
       <div class="world" :style="worldStyle" ref="worldRef">
@@ -980,19 +989,32 @@ function deleteSelected() {
         <!-- 已放置的元件（可拖动） -->
         <div v-for="inst in instances" :key="inst.id" class="inst" :class="{ selected: selectedId === inst.id }"
           :style="{ left: inst.x + 'px', top: inst.y + 'px', transform: 'translate(-50%, -50%) rotate(' + (inst.rotation || 0) + 'deg)' }"
-          @mousedown="(e) => onInstanceMouseDown(e, inst)" @click.stop="() => selectInstance(inst.id)"
+          @pointerdown="(e) => onInstanceMouseDown(e, inst)" @click.stop="() => selectInstance(inst.id)"
           :title="inst.key">
           <div class="inst-box" :style="{ width: inst.size + 'px', height: inst.size + 'px' }">
             <img
-              :src="(elements.find(e => e.key === inst.key)?.stateImages ? (inst.state === 'on' ? elements.find(e => e.key === inst.key)!.stateImages!.on : elements.find(e => e.key === inst.key)!.stateImages!.off) : inst.url)"
+              :src="(elements.find(e => e.key === inst.key)?.stateImages
+                ? (((inst.key === 'switch' ? (inst.props['state'] as string) : inst.state) === 'on')
+                  ? elements.find(e => e.key === inst.key)!.stateImages!.on
+                  : elements.find(e => e.key === inst.key)!.stateImages!.off)
+                : inst.url)"
               :alt="inst.key" :draggable="false"
-              @contextmenu.prevent="() => { const meta = elements.find(e => e.key === inst.key); if (meta?.stateImages) inst.state = inst.state === 'on' ? 'off' : 'on' }" />
+              @contextmenu.prevent="() => {
+                const meta = elements.find(e => e.key === inst.key);
+                if (!meta?.stateImages) return;
+                if (inst.key === 'switch') {
+                  const cur = String(inst.props['state'] ?? 'off');
+                  inst.props['state'] = cur === 'on' ? 'off' : 'on'
+                } else {
+                  inst.state = inst.state === 'on' ? 'off' : 'on'
+                }
+              }" />
 
             <!-- 滑动变阻器滑块 -->
             <img v-if="inst.key === 'sliding_rheostat'" class="rheo-pin"
               :src="(elements.find(e => e.key === inst.key) as any)?.pinUrl" alt="pin" draggable="false" :style="{
                 left: ((getRheostatPinOffset(inst) / inst.size) * 100) + '%',
-              }" @mousedown.stop="() => { sliderDraggingId = inst.id }" />
+              }" @pointerdown.stop="() => { sliderDraggingId = inst.id }" />
 
             <!-- 灯泡发散光线叠加层 -->
             <svg v-if="inst.key === 'light_bulb'" class="bulb-glow" :width="inst.size" :height="inst.size"
@@ -1031,8 +1053,8 @@ function deleteSelected() {
               left: getConnectionPointWorldPos(inst, idx).x + 'px',
               top: getConnectionPointWorldPos(inst, idx).y + 'px'
             }" @click.stop="(e) => onEndpointClick(inst.id, idx, e)"
-              @mouseenter="() => { hoveredEndpoint = { instId: inst.id, cpIndex: idx } }"
-              @mouseleave="() => { if (hoveredEndpoint && hoveredEndpoint.instId === inst.id && hoveredEndpoint.cpIndex === idx) hoveredEndpoint = null }"
+              @pointerenter="() => { hoveredEndpoint = { instId: inst.id, cpIndex: idx } }"
+              @pointerleave="() => { if (hoveredEndpoint && hoveredEndpoint.instId === inst.id && hoveredEndpoint.cpIndex === idx) hoveredEndpoint = null }"
               :title="cp.name || ('P' + (idx + 1))"></div>
           </template>
         </div>
@@ -1083,8 +1105,13 @@ function deleteSelected() {
               <span class="label">{{ schema.label }}</span>
               <input v-if="schema.type === 'number'" type="number" step="any"
                 v-model.number="selectedInst!.props[schema.key]" />
-              <input v-else type="text" v-model="selectedInst!.props[schema.key] as string" />
-              <span class="unit" v-if="schema.unit">{{ schema.unit }}</span>
+              <input v-else-if="schema.type === 'text'" type="text" v-model="selectedInst!.props[schema.key] as string" />
+              <select v-else-if="schema.type === 'select'" v-model="selectedInst!.props[schema.key] as string">
+                <option v-for="opt in (Array.isArray((schema as any).options) ? (schema as any).options : [])" :key="typeof opt === 'string' ? opt : (opt.value)" :value="typeof opt === 'string' ? opt : (opt.value)">
+                  {{ typeof opt === 'string' ? opt : (opt.label || opt.value) }}
+                </option>
+              </select>
+        <span class="unit" v-if="schema.type === 'number' && (schema as any).unit">{{ (schema as any).unit }}</span>
             </label>
           </template>
         </div>
@@ -1105,6 +1132,8 @@ function deleteSelected() {
   /* 左栏 / 画布 / AI 辅助 */
   grid-template-rows: 100vh;
   overflow: hidden;
+  touch-action: none;
+  user-select: none;
 }
 
 .sidebar {
diff --git a/src/elements.ts b/src/elements.ts
index 24f9036..4e9c893 100644
--- a/src/elements.ts
+++ b/src/elements.ts
@@ -35,13 +35,27 @@ export type CircuitElement = {
     pinUrl?: string
 }
 
-export type PropertySchema = {
-    key: string
-    label: string
-    type: 'number' | 'text'
-    unit?: string
-    default: number | string
-}
+export type PropertySchema =
+    | {
+        key: string
+        label: string
+        type: 'number'
+        unit?: string
+        default: number
+    }
+    | {
+        key: string
+        label: string
+        type: 'text'
+        default: string
+    }
+    | {
+        key: string
+        label: string
+        type: 'select'
+        options: Array<{ label?: string; value: string }> | string[]
+        default: string
+    }
 
 // 预设定义：展示名称 + 要覆盖的属性值
 export type Preset = {
@@ -85,11 +99,13 @@ export const elements: CircuitElement[] = [
         defaultSize: 130,
         connectionPoints: [
             { x: 0.05, y: 0.7, name: 'A' },
-            { x: 0.83, y: 0.7, name: 'B' },
+            { x: 0.95, y: 0.7, name: 'B' },
         ],
         // 点击元件切换 on/off 显示
         stateImages: { on: switchOn, off: switchOff },
-        // 开关没有额外可编辑属性
+        propertySchemas: [
+            { key: 'state', label: '状态', type: 'select', options: ['off', 'on'], default: 'off' },
+        ],
     },
     {
         key: 'light_bulb',
diff --git a/vite.config.ts b/vite.config.ts
index bbcf80c..e85f074 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -4,4 +4,7 @@ import vue from '@vitejs/plugin-vue'
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [vue()],
+  server:{
+    host: '0.0.0.0'
+  }
 })