!1826 翻译已完成

Merge pull request !1826 from shawn_he/thermal-1

en/application-dev/reference/apis/js-apis-thermal.md

+# Thermal Management
+
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
+> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+
+## Modules to Import
+
+```
+import thermal from '@ohos.thermal';
+```
+
+
+## ThermalLevel
+
+Represents the thermal level.
+
+| Name| Default Value| Description|
+| -------- | -------- | -------- |
+| COOL | 0 | The device is cool, and services are not restricted.|
+| NORMAL | 1 | The device is operational but is not cool. You need to pay attention to its heating.|
+| WARM | 2 | The device is warm. You need to stop or delay some imperceptible services.|
+| HOT | 3 | The device is heating up. You need to stop all imperceptible services and downgrade or reduce the load of other services.|
+| OVERHEATED | 4 | The device is overheated. You need to stop all imperceptible services and downgrade or reduce the load of major services.|
+| WARNING | 5 | The device is overheated and is about to enter the emergency state. You need to stop all imperceptible services and downgrade major services to the maximum extent.|
+| EMERGENCY | 6 | The device has entered the emergency state. You need to stop all services except those for the emergency help purposes.|
+
+
+## thermal.subscribeThermalLevel
+
+subscribeThermalLevel(callback: AsyncCallback<ThermalLevel>): void
+
+Subscribes to thermal level changes.
+
+**System Capabilities**
+
+SystemCapability.PowerManager.ThermalManager
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | -------- | -------- | -------- |
+| callback | AsyncCallback&lt;ThermalLevel&gt; | Yes| Callback used to obtain the return value. <br/>Return value: thermal level|
+
+**Example**
+
+```
+thermal.subscribeThermalLevel((lev) => {
+    console.info("Thermal level is: " + lev);
+})
+```
+
+## thermal.unsubscribeThermalLevel
+
+unsubscribeThermalLevel(callback?: AsyncCallback<void>): void
+
+Unsubscribes from thermal level changes.
+
+**System Capabilities**
+
+SystemCapability.PowerManager.ThermalManager
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | -------- | -------- | -------- |
+| callback | AsyncCallback&lt;void&gt; | No| Callback without a return value.|
+
+**Example**
+
+```
+thermal.unsubscribeThermalLevel(() => {
+    console.info("Unsubscribe completed.");
+});
+```
+
+## thermal.getThermalLevel
+
+getThermalLevel(): ThermalLevel
+
+Obtains the current thermal level.
+
+**System Capabilities**
+
+SystemCapability.PowerManager.ThermalManager
+
+**Return value**
+
+| Type| Description|
+| -------- | -------- |
+| ThermalLevel | Thermal level obtained.|
+
+**Example**
+
+```
+var lev = thermal.getThermalLevel();
+console.info("Thermal level is: " + lev);
+```