bug fixes

package.json

 {
   "name": "@ezijing/vue-form",
-  "version": "2.1.0",
+  "version": "2.1.3",
   "private": false,
   "description": "基于Vue Element-UI的表单",
   "scripts": {

src/packages/form/src/form.vue

 <template>
   <div class="v-form">
-    <div class="v-form__prepend" v-html="options.prepend"></div>
+    <div class="v-form__prepend" v-html="options.prepend" v-if="options.prepend"></div>
     <el-form
       :disabled="disabled || options.disabled"
       v-bind="options"
@@ -11,9 +11,9 @@
     >
       <template v-for="item in currentItems">
         <el-form-item v-bind="item" :prop="item.model" :key="item.model">
-          <div class="v-form-item__prepend" v-html="item.prepend"></div>
+          <div class="v-form-item__prepend" v-html="item.prepend" v-if="item.prepend"></div>
           <component :is="item.type" :options="item" :data="ruleForm" v-on="$listeners" v-bind="item.attrs"></component>
-          <div class="v-form-item__append" v-html="item.append"></div>
+          <div class="v-form-item__append" v-html="item.append" v-if="item.append"></div>
         </el-form-item>
       </template>
       <el-form-item v-if="hasButton">
@@ -22,7 +22,7 @@
         </slot>
       </el-form-item>
     </el-form>
-    <div class="v-form__append" v-html="options.append"></div>
+    <div class="v-form__append" v-html="options.append" v-if="options.append"></div>
   </div>
 </template>
 
@@ -95,19 +95,4 @@ export default {
     }
   }
 }
-</script>
-
+</script>
\ No newline at end of file
-<style lang="scss">
-.v-form__prepend,
-.v-form-item__prepend {
-  padding-top: 12px;
-  line-height: 26px;
-  color: #00e;
-}
-.v-form__append,
-.v-form-item__append {
-  padding-top: 12px;
-  line-height: 26px;
-  color: #00e;
-}
-</style>
\ No newline at end of file