[bug fix] 修复webview在zoom的时候，点击区域坐标不正确，不能正确响应事件的问题

reviewed by 孙凯

@@ -248,7 +248,12 @@
 - (void)hanldeTapGesture:(UITapGestureRecognizer *)gesture {
     if (gesture == _tapGesture) {
         
+        CGFloat displayWidth = [[self.webView stringByEvaluatingJavaScriptFromString:@"window.innerWidth"] floatValue];
+        CGFloat scale = self.webView.frame.size.width / displayWidth;
         CGPoint touchPoint = [gesture locationInView:self.webView];
+        // 如果webview是zoom状态，把对应的比例除去
+        touchPoint.x /= scale;
+        touchPoint.y /= scale;
         
         BOOL validArea = YES;
         BOOL validIdArea = YES;