Pre Merge pull request !108 from CoderHank/master

library/src/main/ets/components/imageknife/RequestOption.ets

@@ -556,6 +556,16 @@ export class RequestOption {
 
   loadError = (err:BusinessError|string)=>{
     LogUtil.log("loadError:" + err);
+    //失败回调
+    if(this.requestListeners != undefined) {
+      for (let i = 0;i < this.requestListeners.length; i++) {
+        let requestListener = this.requestListeners[i];
+        let boolInterception = requestListener.callback(err.toString(), new ImageKnifeData());
+        if (boolInterception) {
+          break;
+        }
+      }
+    }
     // 失败占位图展示规则
     if (this.retryholderFunc) {
       // 重试图层优先于加载失败展示