fix the image size over the canvas

public/self/js/Director/detection.js

@@ -2856,11 +2856,17 @@ function isJSON(str) {
     canvas.width = img.width;// maxWidth document.getElementById("tool0").offsetWidth;
     canvas.height =img.height;//maxHeight document.getElementById("tool0").offsetWidth/1280*720;
     //调整画布大小
-    if ((img.width/img.height)<(canvas.width/canvas.height)){
-      canvas.width=canvas.height * img.width / img.height;
+    // if ((img.width/img.height)>(maxWidth/maxWidth)){
+    //   canvas.width=canvas.height * img.width / img.height;
+    // }
+    // else{
+    //   canvas.height=canvas.width * img.height / img.width;
+    // }
+    if(canvas.width>maxWidth){
+      canvas.width = maxWidth
     }
-    else{
-      canvas.height=canvas.width * img.height / img.width;
+    if(canvas.height>maxHeight){
+      canvas.height=maxHeight
     }
 
     maxIdNum=0;