refactor example demo (#713)

* refactor: Adjust the example directory structure

* perf form demo

* refine editor-slide-upload css

* refine demo

src/views/table/dynamicTable/fixedThead.vue

@@ -0,0 +1,58 @@
+<template>
+  <div class="app-container">
+
+    <div class="filter-container">
+      <el-checkbox-group v-model="checkboxVal">
+        <el-checkbox label="apple">apple</el-checkbox>
+        <el-checkbox label="banana">banana</el-checkbox>
+        <el-checkbox label="orange">orange</el-checkbox>
+      </el-checkbox-group>
+    </div>
+
+    <el-table :data="tableData" :key='key' border fit highlight-current-row style="width: 100%">
+      <el-table-column prop="name" label="fruitName" width="180"></el-table-column>
+      <el-table-column :key='fruit' v-for='fruit in formThead' :label="fruit">
+        <template slot-scope="scope">
+          {{scope.row[fruit]}}
+        </template>
+      </el-table-column>
+    </el-table>
+
+  </div>
+</template>
+
+<script>
+const defaultFormThead = ['apple', 'banana']
+
+export default {
+  data() {
+    return {
+      tableData: [
+        {
+          name: 'fruit-1',
+          apple: 'apple-10',
+          banana: 'banana-10',
+          orange: 'orange-10'
+        },
+        {
+          name: 'fruit-2',
+          apple: 'apple-20',
+          banana: 'banana-20',
+          orange: 'orange-20'
+        }
+      ],
+      key: 1, // table key
+      formTheadOptions: ['apple', 'banana', 'orange'],
+      checkboxVal: defaultFormThead, // checkboxVal
+      formThead: defaultFormThead // 默认表头 Default header
+    }
+  },
+  watch: {
+    checkboxVal(valArr) {
+      this.formThead = this.formTheadOptions.filter(i => valArr.indexOf(i) >= 0)
+      this.key = this.key + 1// 为了保证table 每次都会重渲 In order to ensure the table will be re-rendered each time
+    }
+  }
+}
+</script>
+