增加cron-editor组件 --- fix1

src/components/cron-editor/cron-editor.vue

 <template>
     <Select
-        v-model="model"
+        v-model="value[0]"
         class="transfer-select"
+        @on-change='handleCronChange'
         :disabled="disabled"
-        :placeholder="placeholder"
-        multiple>
+        :placeholder="placeholder">
+        <Option class="hidden" v-for="(item,i) in value" :value="item" :label="item" :key="i">
+        </Option>
         <vue-cron class='vue-cron'  @cronValue='handleCronChange'></vue-cron>
     </Select>
     
@@ -22,14 +24,6 @@ import VueCron from './vue-cron/vue-cron.vue';
 })
 export default class CronEditor extends Vue {
     
-    /**
-     * 下拉列表数据（设置为空）
-     *
-     * @type {any}
-     * @memberof CronEditor
-     */ 
-    public model: any = '';
-
     /**
      * 启用状态
      *
@@ -46,14 +40,31 @@ export default class CronEditor extends Vue {
      */ 
     @Prop() placeholder:any;
 
+    /**
+     * 绑定Cron表达式
+     * 
+     * @type {any[]}
+     * @memberof CronEditor
+     */
+    public value: any[] = [];
+
     /**
      * 处理返回Cron表达式
      *
      * @type {any}
      * @memberof CronEditor
      */ 
-    public handleCronChange(newVal: any, oldVal: any) {
-        
+    public handleCronChange(val: any) {
+        this.value[0] = val;
+        this.value.push(val);
+    }
+
+    /**
+     * Vue生命周期
+     * 
+     */
+    public created() {
+        this.value[0] = '';
     }
 }