fix bugs

stmms-web/src/main/webapp/static/mark-json/js/json-view.js

@@ -65,7 +65,10 @@ JsonView.prototype.render = function () {
         	$("<span>考生答案：<span>"+renderRichText(question.studentAnswer)).appendTo(this.container);
             $("<span>标准答案：<span>"+renderRichText(question.answer)).appendTo(this.container);
         });
-        const viewer = new Viewer($('.image-content')[0], {
+        var viewer = new Viewer($('.image-content')[0], {
+        });
+        viewer.destroy();
+        viewer = new Viewer($('.image-content')[0], {
         });
         this.markControl.trigger('task.load.finish');
     }