refactor example demo (#713)

* refactor: Adjust the example directory structure

* perf form demo

* refine editor-slide-upload css

* refine demo

src/views/tab/index.vue

@@ -0,0 +1,46 @@
+<template>
+  <div class="tab-container">
+    <el-tag>mounted times ：{{createdTimes}}</el-tag>
+    <el-alert style="width:200px;display:inline-block;vertical-align: middle;margin-left:30px;" title="Tab with keep-alive" type="success" :closable="false">
+    </el-alert>
+    <el-tabs style='margin-top:15px;' v-model="activeName" type="border-card">
+      <el-tab-pane v-for="item in tabMapOptions" :label="item.label" :key='item.key' :name="item.key">
+        <keep-alive>
+          <tab-pane v-if='activeName==item.key' :type='item.key' @create='showCreatedTimes'></tab-pane>
+        </keep-alive>
+      </el-tab-pane>
+    </el-tabs>
+  </div>
+</template>
+
+<script>
+import tabPane from './components/tabPane'
+
+export default {
+  name: 'tab',
+  components: { tabPane },
+  data() {
+    return {
+      tabMapOptions: [
+        { label: 'China', key: 'CN' },
+        { label: 'USA', key: 'US' },
+        { label: 'Japan', key: 'JP' },
+        { label: 'Eurozone', key: 'EU' }
+      ],
+      activeName: 'CN',
+      createdTimes: 0
+    }
+  },
+  methods: {
+    showCreatedTimes() {
+      this.createdTimes = this.createdTimes + 1
+    }
+  }
+}
+</script>
+
+<style scoped>
+  .tab-container{
+    margin: 30px;
+  }
+</style>