* 采用inject方法，修正问题：当FormItem组件在slot里时，无法正确获取form组件

src/components/form/form-item.vue

@@ -92,6 +92,7 @@
                 this.validateState = val;
             }
         },
+        inject: ['form'],
         computed: {
             classes () {
                 return [
@@ -103,13 +104,13 @@
                     }
                 ];
             },
-            form() {
-                let parent = this.$parent;
-                while (parent.$options.name !== 'iForm') {
-                    parent = parent.$parent;
-                }
-                return parent;
-            },
+            // form() {
+            //    let parent = this.$parent;
+            //    while (parent.$options.name !== 'iForm') {
+            //        parent = parent.$parent;
+            //    }
+            //    return parent;
+            // },
             fieldValue: {
                 cache: false,
                 get() {

src/components/form/form.vue

@@ -40,6 +40,9 @@
                 default: 'off'
             }
         },
+        provide() {
+            return { form : this };
+        },
         data () {
             return {
                 fields: []