完成d.ts定义的优化

types/affix.d.ts

@@ -0,0 +1,22 @@
+// Type definitions for iview 3.0.1
+// Project: https://github.com/iview/iview
+// Definitions by: yangdan
+// Definitions: https://github.com/yangdan8/iview.git
+import Vue, { VNode } from "vue";
+
+export declare class Affix extends Vue {
+  /**
+   * 距离窗口顶部达到指定偏移量后触发
+   * @default 0
+   */
+  'offset-top'?: number;
+  /**
+   * 距离窗口底部达到指定偏移量后触发
+   */
+  'offset-bottom'?: number;
+  /**
+   * 在固定状态发生改变时触发
+   * @param value true | false
+   */
+  $emit(eventName: 'on-change', value: boolean): this;
+}