!6090 Add formExtensionContext::startAbility Reference

Merge pull request !6090 from 闫文豪/feature52

zh-cn/application-dev/reference/apis/js-apis-formextensioncontext.md

@@ -86,3 +86,74 @@ updateForm(formId: string, formBindingData: formBindingData.FormBindingData): Pr
   }
 
   ```
+
+## FormExtensionContext.startAbility
+
+startAbility(want: Want, callback: AsyncCallback<void>): void
+
+拉起一个卡片所属应用的Ability。
+
+**系统能力**：SystemCapability.Ability.Form
+
+**参数：**
+
+| 参数名 |                类型               | 必填 |              说明               |
+| ------| --------------------------------- | ---- | -------------------------------------- |
+| want| [Want](js-apis-application-Want.md) | 是  | 包含bundleName，abilityName以及用户自定参数用于拉起Ability。 |
+| callback| AsyncCallback<void>       | 是  | 回调函数，返回接口调用是否成功的结果。 |
+
+**示例：**
+
+```js
+var want = {
+    deviceId: "",
+    bundleName: "com.example.formstartability",
+    abilityName: "MainAbility",
+    action: "action1",
+    entities: ["entity1"],
+    type: "MIMETYPE",
+    uri: "key={true,true,false}",
+    parameters: {}
+}
+this.context.startAbility(want, function(err) {
+    console.info(err.code);
+})
+```
+
+## FormExtensionContext.startAbility
+
+startAbility(want: Want): Promise<void>
+
+**系统能力**：SystemCapability.Ability.Form
+
+**参数：**
+
+| 参数名 |                类型               | 必填 |              说明               |
+| ------| --------------------------------- | ---- | -------------------------------------- |
+| want| [Want](js-apis-application-Want.md) | 是  | 包含bundleName，abilityName以及用户自定参数用于拉起Ability。 |
+
+**返回值：**
+
+| 类型          | 说明                                |
+| ------------ | ---------------------------------- |
+| Promise<void< | Promise实例，返回接口调用是否成功的结果。 |
+
+**示例：**
+
+```js
+var want = {
+    deviceId: "",
+    bundleName: "com.example.formstartability",
+    abilityName: "MainAbility",
+    action: "action1",
+    entities: ["entity1"],
+    type: "MIMETYPE",
+    uri: "key={true,true,false}",
+    parameters: {}
+}
+this.context.startAbility(want).then(() => {
+    console.info("StartAbility Success");
+}).catch((error) => {
+    console.info("StartAbility failed");
+});
+```
\ No newline at end of file