Cascader support global setting

src/components/cascader/cascader.vue

@@ -97,7 +97,10 @@
             },
             size: {
                 validator (value) {
-                    return oneOf(value, ['small', 'large']);
+                    return oneOf(value, ['small', 'large', 'default']);
+                },
+                default () {
+                    return this.$IVIEW.size === '' ? 'default' : this.$IVIEW.size;
                 }
             },
             trigger: {
@@ -128,7 +131,9 @@
             },
             transfer: {
                 type: Boolean,
-                default: false
+                default () {
+                    return this.$IVIEW.transfer === '' ? false : this.$IVIEW.transfer;
+                }
             },
             name: {
                 type: String