diff --git a/src/views/VirtualLab.vue b/src/views/VirtualLab.vue
index 843ded8..d3f7368 100644
--- a/src/views/VirtualLab.vue
+++ b/src/views/VirtualLab.vue
@@ -651,17 +651,10 @@ watchEffect(() => { solveMNA() })
 function meterText(inst: Instance) {
   const live = instLive[inst.id]
   const i = live?.i ?? 0
-  const r = inst.props?.['resistance'] ? safeNum(inst.props?.['resistance'], 0) : 0
-  const code = String(inst.props?.['renderFunc'] || '')
-  if (!code) return `${(i).toFixed(6)} A`
-  try {
-    // 允许两种形态："(i)=>..." 或 "(i,v,props)=>..."
-    const fn = new Function('i', 'r', 'props', 'return (' + code + ')(i, r, props)')
-    const out = fn(i, r, inst.props)
-    return String(out)
-  } catch {
-    return `ERR_RF`
-  }
+  const num = Number(inst.props?.['dispNum'] || '')
+  const fig = Number(inst.props?.['dispFig'] || '')
+  const unit = String(inst.props?.['dispUnit'] || 'A')
+  return `${(i * num).toFixed(fig)} ${unit}`
 }
 
 // 灯泡发光参数：随电流变化增加线条数量、长度、透明度
@@ -1031,8 +1024,7 @@ function editTextBox(inst: Instance) {
 </script>
 
 <template>
-  <div class="app" :style="{ '--ai-width': showAI ? '360px' : '0px' }"
-    :class="{ 'preview-mode': isPreview }">
+  <div class="app" :style="{ '--ai-width': showAI ? '360px' : '0px' }" :class="{ 'preview-mode': isPreview }">
     <!-- 左侧元件面板 -->
     <aside class="sidebar" v-if="!isPreview">
       <RouterLink class="back-to-home" to="/">
@@ -1041,9 +1033,8 @@ function editTextBox(inst: Instance) {
 
       <h2>元件</h2>
       <div class="palette">
-        <div v-for="item in palette" :key="item.key" class="palette-item"
-          draggable="true" @dragstart="(e) => onPaletteDragStart(e, item)"
-          :title="item.name">
+        <div v-for="item in palette" :key="item.key" class="palette-item" draggable="true"
+          @dragstart="(e) => onPaletteDragStart(e, item)" :title="item.name">
           <img :src="item.url" :alt="item.name" draggable="false" />
           <span class="label">{{ item.name }}</span>
         </div>
@@ -1054,8 +1045,8 @@ function editTextBox(inst: Instance) {
         <button class="btn" @click="triggerImport">导入 JSON</button>
         <!-- 上传模型到模型广场（需登录） -->
         <UploadButton :makeSave="makeSave" />
-        <input ref="importInputRef" type="file" accept="application/json,.json"
-          class="hidden-file" @change="onImportFileChange" />
+        <input ref="importInputRef" type="file" accept="application/json,.json" class="hidden-file"
+          @change="onImportFileChange" />
       </div>
     </aside>
 
@@ -1063,40 +1054,33 @@ function editTextBox(inst: Instance) {
     <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">
+      @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">
         <!-- 导线（SVG 覆盖层） -->
-        <svg class="wires" :width="state.worldSize" :height="state.worldSize"
-          @mousemove="onViewportMouseMoveTrack">
+        <svg class="wires" :width="state.worldSize" :height="state.worldSize" @mousemove="onViewportMouseMoveTrack">
           <g>
-            <g v-for="w in wires" :key="w.id" class="wire-group"
-              @click.stop="(e) => removeWire(w.id, e)">
-              <line class="wire-base"
-                :x1="getConnectionPointWorldPos(getInstance(w.a.instId)!, w.a.cpIndex).x"
+            <g v-for="w in wires" :key="w.id" class="wire-group" @click.stop="(e) => removeWire(w.id, e)">
+              <line class="wire-base" :x1="getConnectionPointWorldPos(getInstance(w.a.instId)!, w.a.cpIndex).x"
                 :y1="getConnectionPointWorldPos(getInstance(w.a.instId)!, w.a.cpIndex).y"
                 :x2="getConnectionPointWorldPos(getInstance(w.b.instId)!, w.b.cpIndex).x"
-                :y2="getConnectionPointWorldPos(getInstance(w.b.instId)!, w.b.cpIndex).y"
-                stroke-linecap="round" vector-effect="non-scaling-stroke" />
+                :y2="getConnectionPointWorldPos(getInstance(w.b.instId)!, w.b.cpIndex).y" stroke-linecap="round"
+                vector-effect="non-scaling-stroke" />
             </g>
 
             <!-- 预览线：当选中一个端点时，显示到鼠标或吸附端点的线 -->
             <line v-if="pendingEndpoint"
               :x1="getConnectionPointWorldPos(getInstance(pendingEndpoint.instId)!, pendingEndpoint.cpIndex).x"
               :y1="getConnectionPointWorldPos(getInstance(pendingEndpoint.instId)!, pendingEndpoint.cpIndex).y"
-              :x2="previewTarget.x" :y2="previewTarget.y"
-              class="wire preview" />
+              :x2="previewTarget.x" :y2="previewTarget.y" class="wire preview" />
           </g>
         </svg>
 
         <!-- 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 }"
+        <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)' }"
-          @pointerdown="(e) => onInstanceMouseDown(e, inst)"
-          @click.stop="() => selectInstance(inst.id)"
+          @pointerdown="(e) => onInstanceMouseDown(e, inst)" @click.stop="() => selectInstance(inst.id)"
           :title="(elements.find(e => e.key === inst.key)?.name || inst.key)">
           <div class="inst-box"
             :style="{ width: inst.size > 0 ? inst.size + 'px' : 'auto', height: inst.size > 0 ? inst.size + 'px' : 'auto' }">
@@ -1104,8 +1088,7 @@ function editTextBox(inst: Instance) {
               ? (((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="() => {
+              : inst.url)" :alt="inst.key" :draggable="false" @contextmenu.prevent="() => {
                 const meta = elements.find(e => e.key === inst.key);
                 if (!meta?.stateImages) return;
                 if (inst.key === 'switch') {
@@ -1126,36 +1109,31 @@ function editTextBox(inst: Instance) {
 
             <!-- 电阻色环叠加层：根据实时电阻值渲染 4 个色带 -->
             <template v-if="inst.key === 'resistor'">
-              <div v-for="(c, bi) in getResistorBandColors(inst)" :key="bi"
-                class="res-band" :style="{
-                  left: getResBandX(inst, bi) + 'px',
-                  top: (inst.size * RES_BAND_TOP_FRAC) + 'px',
-                  width: (inst.size * RES_BAND_WIDTH_FRAC) + 'px',
-                  height: (inst.size * RES_BAND_HEIGHT_FRAC) + 'px',
-                  backgroundColor: c
-                }"></div>
+              <div v-for="(c, bi) in getResistorBandColors(inst)" :key="bi" class="res-band" :style="{
+                left: getResBandX(inst, bi) + 'px',
+                top: (inst.size * RES_BAND_TOP_FRAC) + 'px',
+                width: (inst.size * RES_BAND_WIDTH_FRAC) + 'px',
+                height: (inst.size * RES_BAND_HEIGHT_FRAC) + 'px',
+                backgroundColor: c
+              }"></div>
             </template>
 
             <!-- 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="{
+              :src="(elements.find(e => e.key === inst.key) as any)?.pinUrl" alt="pin" draggable="false" :style="{
                 left: ((getRheostatPinOffset(inst) / inst.size) * 100) + '%',
               }" @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"
-              :viewBox="'0 0 ' + inst.size + ' ' + inst.size"
-              aria-hidden="true">
+            <svg v-if="inst.key === 'light_bulb'" class="bulb-glow" :width="inst.size" :height="inst.size"
+              :viewBox="'0 0 ' + inst.size + ' ' + inst.size" aria-hidden="true">
               <g :opacity="getBulbGlow(inst).opacity">
                 <line v-for="k in getBulbGlow(inst).count" :key="k"
                   :x1="(inst.size / 2) + Math.cos(2 * Math.PI * (k - 1) / getBulbGlow(inst).count) * (inst.size * 0.42)"
                   :y1="(inst.size / 2) + Math.sin(2 * Math.PI * (k - 1) / getBulbGlow(inst).count) * (inst.size * 0.42)"
                   :x2="(inst.size / 2) + Math.cos(2 * Math.PI * (k - 1) / getBulbGlow(inst).count) * (inst.size * (0.42 + getBulbGlow(inst).lenFrac))"
                   :y2="(inst.size / 2) + Math.sin(2 * Math.PI * (k - 1) / getBulbGlow(inst).count) * (inst.size * (0.42 + getBulbGlow(inst).lenFrac))"
-                  stroke="#f59e0b" stroke-width="2" stroke-linecap="round"
-                  vector-effect="non-scaling-stroke" />
+                  stroke="#f59e0b" stroke-width="2" stroke-linecap="round" vector-effect="non-scaling-stroke" />
               </g>
             </svg>
 
@@ -1173,8 +1151,7 @@ function editTextBox(inst: Instance) {
 
         <!-- 连接点（显示为虚线圆圈） -->
         <div v-for="inst in instances" :key="inst.id + '-cps'">
-          <template
-            v-for="(cp, idx) in (elements.find(e => e.key === inst.key)?.connectionPoints || [])"
+          <template v-for="(cp, idx) in (elements.find(e => e.key === inst.key)?.connectionPoints || [])"
             :key="inst.id + '-' + idx">
             <div class="endpoint" :class="{
               active: pendingEndpoint && pendingEndpoint.instId === inst.id && pendingEndpoint.cpIndex === idx,
@@ -1194,49 +1171,39 @@ function editTextBox(inst: Instance) {
 
     <!-- 右侧 AI 助手面板 -->
     <aside v-if="!isPreview && showAI" class="ai-aside">
-      <AIAssistant :state="aiState" @error="onAiError"
-        @close="showAI = false" />
+      <AIAssistant :state="aiState" @error="onAiError" @close="showAI = false" />
     </aside>
-    <button v-else-if="!isPreview" class="ai-reopen" title="打开 AI 助手"
-      @click="showAI = true">◀</button>
+    <button v-else-if="!isPreview" class="ai-reopen" title="打开 AI 助手" @click="showAI = true">◀</button>
 
     <!-- 底部属性面板：编辑选中元件的业务属性（非尺寸） -->
-    <footer v-if="selectedInst" class="bottom-panel"
-      :style="{ right: showAI ? '360px' : '0' }">
+    <footer v-if="selectedInst" class="bottom-panel" :style="{ right: showAI ? '360px' : '0' }">
       <div class="panel-inner">
         <div class="prop-title">{{ selectedInst.key }} 属性</div>
         <!-- 预设按钮区域：显示当前元件的预设，点击一键应用（当未隐藏属性时） -->
-        <div
-          v-if="selectedMeta?.preset?.length && String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'"
+        <div v-if="selectedMeta?.preset?.length && String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'"
           class="presets">
           <span class="preset-label">预设</span>
-          <button v-for="p in selectedMeta!.preset" :key="p.name"
-            class="preset-btn" @click.stop="applyPreset(p)">{{
-              p.name
-            }}</button>
+          <button v-for="p in selectedMeta!.preset" :key="p.name" class="preset-btn" @click.stop="applyPreset(p)">{{
+            p.name
+          }}</button>
         </div>
         <div class="props">
           <!-- 实时电学量（在隐藏属性=on时不显示） -->
-          <label class="prop-row"
-            v-if="String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'">
+          <label class="prop-row" v-if="String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'">
             <span class="label">电压</span>
             <span>{{ formatValue(instLive[selectedInst!.id]?.v ?? null, 'V')
-            }}</span>
+              }}</span>
           </label>
-          <label class="prop-row"
-            v-if="String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'">
+          <label class="prop-row" v-if="String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'">
             <span class="label">电流</span>
             <span>{{ formatValue(instLive[selectedInst!.id]?.i ?? null, 'A')
-            }}</span>
+              }}</span>
           </label>
           <!-- 旋转控制（在隐藏属性=on时不显示） -->
-          <label class="prop-row"
-            v-if="String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'">
+          <label class="prop-row" v-if="String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'">
             <span class="label">旋转</span>
-            <input type="range" min="-180" max="180" step="1"
-              v-model.number="selectedInst!.rotation" />
-            <input type="number" class="deg-input" step="1"
-              v-model.number="selectedInst!.rotation" />
+            <input type="range" min="-180" max="180" step="1" v-model.number="selectedInst!.rotation" />
+            <input type="number" class="deg-input" step="1" v-model.number="selectedInst!.rotation" />
             <span class="unit">deg</span>
             <button class="rot-btn"
               @click="selectedInst!.rotation = ((selectedInst!.rotation || 0) - 45 + 360) % 360">-45°</button>
@@ -1252,8 +1219,7 @@ function editTextBox(inst: Instance) {
             </select>
           </label>
           <!-- 业务属性编辑：当未隐藏属性时显示 -->
-          <template
-            v-if="String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'"
+          <template v-if="String(selectedInst!.props['hideProps'] ?? 'off') !== 'on'"
             v-for="schema in (elements.find(e => e.key === selectedInst!.key)?.propertySchemas || [])"
             :key="schema.key">
             <label class="prop-row" v-if="schema.key !== 'hideProps'">
@@ -1264,25 +1230,21 @@ function editTextBox(inst: Instance) {
                 v-model="selectedInst!.props[schema.key] as string" />
               <input v-else-if="schema.type === 'color'" type="color"
                 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 : [])"
+              <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>
+              <span class="unit" v-if="schema.type === 'number' && (schema as any).unit">{{
+                (schema as any).unit }}</span>
             </label>
           </template>
         </div>
         <!-- 右侧操作区：删除按钮 -->
         <div class="panel-actions">
-          <button class="danger-btn" title="删除此元件及其所有连接的导线"
-            @click="deleteSelected">删除元件</button>
+          <button class="danger-btn" title="删除此元件及其所有连接的导线" @click="deleteSelected">删除元件</button>
         </div>
       </div>
     </footer>
diff --git a/src/views/elements.ts b/src/views/elements.ts
index 245532e..9c58ff3 100644
--- a/src/views/elements.ts
+++ b/src/views/elements.ts
@@ -196,17 +196,19 @@ export const elements: CircuitElement[] = [
             { x: 0.45, y: 1, name: '负极' },
         ],
         preset: [{
-            name: '微安电流表', propertyValues: { resistance: 0.05, renderFunc: '(i) => `${(i * 1000000).toFixed(0)} uA`' }
+            name: '微安电流表', propertyValues: { resistance: 0.05, dispNum: 1000000, dispFig: 2, dispUnit: 'uA' }
         }, {
-            name: '毫安电流表', propertyValues: { resistance: 0.5, renderFunc: '(i) => `${(i * 1000).toFixed(1)} mA`' }
+            name: '毫安电流表', propertyValues: { resistance: 0.5, dispNum: 1000, dispFig: 1, dispUnit: 'mA' }
         }, {
-            name: '电流表', propertyValues: { resistance: 0.1, renderFunc: '(i) => `${(i).toFixed(2)} A`' }
+            name: '电流表', propertyValues: { resistance: 0.1, dispNum: 1, dispFig: 2, dispUnit: 'A' }
         }, {
-            name: '电压表', propertyValues: { resistance: 10000000, renderFunc: '(i, r) => `${(i * r).toFixed(2)} V`' }
+            name: '电压表', propertyValues: { resistance: 10000000, dispNum: 10000000, dispFig: 2, dispUnit: 'V' }
         }],
         propertySchemas: [
             { key: 'resistance', label: '电阻', type: 'number', unit: 'Ω', default: 0.1 },
-            { key: 'renderFunc', label: '显示函数', type: 'text', default: '(i) => `${(i).toFixed(2)} A`' },
+            { key: 'dispNum', label: '显示数值倍率', type: 'number', default: 1 },
+            { key: 'dispFig', label: '有效数字位数', type: 'number', default: 2 },
+            { key: 'dispUnit', label: '单位', type: 'text', default: 'A' },
         ],
     },
     {
diff --git a/src/vite-env.d.ts b/src/vite-env.d.ts
index 11f02fe..1cb43d5 100644
--- a/src/vite-env.d.ts
+++ b/src/vite-env.d.ts
@@ -1 +1,7 @@
 /// <reference types="vite/client" />
+
+declare module '*.vue' {
+  import { DefineComponent } from 'vue'
+  const component: DefineComponent<{}, {}, any>
+  export default component
+}
\ No newline at end of file