update table example

src/components/table/cell.vue

@@ -1,6 +1,6 @@
 <template>
     <div :class="classes" ref="cell">
-        <template v-if="renderType === 'index'">{{naturalIndex + 1}}</template>
+        <template v-if="renderType === 'index'"><span>{{naturalIndex + 1}}</span></template>
         <template v-if="renderType === 'selection'">
             <Checkbox :value="checked" @click.native.stop="handleClick" @on-change="toggleSelect" :disabled="disabled"></Checkbox>
         </template>

src/components/table/table-head.vue

@@ -23,6 +23,8 @@
                                 v-if="isPopperShow(column)"
                                 v-model="column._filterVisible"
                                 placement="bottom"
+                                popper-class="ivu-table-popper"
+                                transfer
                                 @on-popper-hide="handleFilterHide(column._index)">
                                 <span :class="[prefixCls + '-filter']">
                                     <i class="ivu-icon ivu-icon-funnel" :class="{on: column._isFiltered}"></i>