1.README.md update:completed the sample code

Signed-off-by: zhoulisheng <635547767@qq.com>

README.md

@@ -39,34 +39,7 @@ export default {
 }
 ```
 
-2.在页面index.ets中使用ImageKnife。
+2.参考[推荐使用](###'推荐使用')或[自定义实现](###'自定义实现')
-
-```typescript
-@Entry
-@Component
-struct Index {
-  build() {
-    
-  }
-  
-  // 页面初始化完成，生命周期回调函数中 进行调用ImageKnife
-  aboutToAppear() {
-  let requestOption = new RequestOption();
-  requestOptin.load($r('app.media.IceCream'))
-  .addListener((err,data) => {
-      //加载成功/失败回调监听
-    })
-    ...
-  ImageKnife.call(requestOption)
-  }
-}
-
-var ImageKnife;
-var defaultTemp = globalThis.exports.default
-if (defaultTemp != undefined) {
-  ImageKnife = defaultTemp.data.imageKnife;
-}
-```
 
 
 
@@ -144,6 +117,13 @@ let requestOptin = new RequestOption();
     requestOptin.load($r('app.media.jpgSample'))
     .addListener((err,data) => {
       //加载成功/失败回调监听
+        if (data.isPixelMap()) {
+        this.displayPixelMap(data);
+        let pixelMapPack = new PixelMapPack();
+        pixelMapPack.pixelMap = data.imageKnifeValue as PixelMap;
+        //当前的PixelMap资源发生变化，jpgSample图片将会由Image组件重新渲染，并展示  
+        this.imageKnifePixelMapPack = pixelMapPack;
+      }
     })
     .placeholder( $r('app.media.icon_loading'), (data)=>{
         // 占位图回调监听