1.当loadSrc参数传入为undefined时,结束gif循环和原有的canvas数据内容

Signed-off-by: zhoulisheng1 <zhoulisheng1@huawei.com>

imageknife/src/main/ets/components/imageknife/ImageKnifeComponent.ets

@@ -19,7 +19,7 @@ import { RequestOption } from '../imageknife/RequestOption'
 import { ImageKnifeData } from '../imageknife/ImageKnifeData'
 import { GIFFrame } from '../imageknife/utils/gif/GIFFrame'
 import { IDrawLifeCycle } from '../imageknife/interface/IDrawLifeCycle'
-import {LogUtil} from '../imageknife/utils/LogUtil'
+import { LogUtil } from '../imageknife/utils/LogUtil'
 
 
 @Component
@@ -251,11 +251,15 @@ export struct ImageKnifeComponent {
   }
   // imageknife 第一次启动和数据刷新后重新发送请求
   imageKnifeExecute() {
-    if(this.imageKnifeOption.loadSrc == null){
-      // 如果数据是null或者undefined 则不进入图片请求流程
+    if (this.imageKnifeOption.loadSrc == null) {
+      // 如果数据是null或者undefined,清空图片内容和gif循环，并且不进入图片请求流程
+      this.resetGifData()
+      if (this.canvasHasReady) {
+        // 如果canvas已经初始化好了，清空原有的canvas内容
+        this.context.clearRect(0, 0, this.currentWidth, this.currentHeight)
+      }
       return
     }
-
     this.resetGifData()
     let request = new RequestOption();
     this.configNecessary(request);