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@@ -38,3 +38,4 @@ FineUI 100个问题题,带你走进FineUI的世界
 - [14、BI.config的执行顺序是什么,为什么这么设计](https://code.fanruan.com/dailer/FineUI-100-Questions/src/branch/master/questions/10.BI.config的执行顺序是什么,为什么这么设计.md)
 - [15、combo的一些特性详解](https://code.fanruan.com/dailer/FineUI-100-Questions/src/branch/master/questions/80.combo的一些特性详解.md)
 - [16、利用响应式编写组件代码的新思路](https://code.fanruan.com/dailer/FineUI-100-Questions/src/branch/master/questions/43.利用响应式编写组件代码的新思路.md)
+- [17、如何提供异步配置的接口](https://code.fanruan.com/dailer/FineUI-100-Questions/src/branch/master/questions/44.如何提供异步配置的接口.md)
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+# 如何提供异步配置的接口
+
+回顾一下我们常用的提供拓展接口方式
+
+1. 定义privider
+2. 在被拓展的组件中调用`BI.Providers.getProvider().xxx`
+3. 开发者通过`BI.config(xxx,privider => provider.inject())`注册
+
+我们提供的配置接口,绝大多数时候都要求BI.config 要在资源加载前执行
+但是有些时候,插件资源是异步加载到,配置代码要异步执行,该如何设计接口?
+
+![示例](../images/18.gif)
+
+这里分享一个利用响应式特性开放异步接口的方式,核心思路是将拓展数据定义为响应式的,然后组件层采用响应式写法
+
+
+首先我们在Provider中定义响应式数据
+
+```js
+const Provider = function () {
+
+    const state = Fix.define({
+        menus: [],
+    });
+
+    this.inject = function (menu) {
+        state.menus.push(menu);
+    };
+
+    this.$get = function () {
+        return BI.inherit(BI.OB, {
+            getMenus: () => {
+                return state.menus.slice(0);
+            },
+        });
+    };
+
+};
+BI.provider("demo.provider.menus", Provider);
+```
+
+
+之后再组件中通过函数响应式使用provider提供的数据即可
+```js
+const Menus = function () {
+
+    const getMenuItems = function () {
+        return BI.Providers.getProvider("demo.provider.menus").getMenus();
+    };
+
+    const defaultMenus = [
+        {
+            type: "bi.button",
+            text: "第一个",
+        }, {
+            type: "bi.button",
+            text: "第二个",
+        },
+    ];
+
+    return {
+        type: "bi.vertical",
+        items: () => BI.concat(defaultMenus, getMenuItems()),
+    };
+};
+```
+
+开发者依然通过同步的方式调用`BI.config`,但是配置函数却可以是异步的
+(思考一下为什么不是`setTimout(() => BI.config()`这种写法)
+```js
+BI.config("demo.provider.menus", provider => {
+    setTimeout(() => {
+        provider.inject({
+            type: "bi.button",
+            text: "第三个",
+        });
+    }, 4000);
+});
+```
+
+最终的效果呈现
+
+![示例](../images/19.gif)
+
+```demo
+const Provider = function () {
+
+    const state = Fix.define({
+        menus: [],
+    });
+
+    this.inject = function (menu) {
+        state.menus.push(menu);
+    };
+
+    this.$get = function () {
+        return BI.inherit(BI.OB, {
+            getMenus: () => {
+                return state.menus.slice(0);
+            },
+        });
+    };
+
+};
+BI.provider("demo.provider.menus", Provider);
+
+const Menus = function () {
+
+    const getMenuItems = function () {
+        return BI.Providers.getProvider("demo.provider.menus").getMenus();
+    };
+
+    const defaultMenus = [
+        {
+            type: "bi.button",
+            text: "第一个",
+        }, {
+            type: "bi.button",
+            text: "第二个",
+        },
+    ];
+
+    return {
+        type: "bi.vertical",
+        items: () => BI.concat(defaultMenus, getMenuItems()),
+    };
+};
+
+BI.config("demo.provider.menus", provider => {
+    setTimeout(() => {
+        provider.inject({
+            type: "bi.button",
+            text: "第三个",
+        });
+    }, 4000);
+});
+
+
+const Widget10 = BI.createWidget({
+    type: "bi.vertical",
+    items: [
+        {
+            el: Menus(),
+        },
+    ],
+});
+
+return Widget10;
+
+```
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