解决HiDPI/Retina显示器进入tpi时，提示缩放比例变动的问题。

public/javascripts/educoder/edu_application.js

@@ -1113,13 +1113,16 @@ function _initZoomCheck() {
     if (!IsPC()) {      // 手机端不需要提示
         return;
     }
-    var isNormalZoom = Math.round(window.devicePixelRatio * 100) === 100
+    var ratio = Math.round(window.devicePixelRatio * 100);
+    //  A value of 1 indicates a classic 96 DPI (76 DPI on some platforms) display, while a value of 2 is expected for HiDPI/Retina displays
+    var isNormalZoom = ratio === 100 || ratio === 200
     if (!isNormalZoom) {
         suofang();
     }
 
     $(window).resize(function() {
-        var isNormalZoom = Math.round(window.devicePixelRatio * 100) === 100
+        var ratio = Math.round(window.devicePixelRatio * 100);
+        var isNormalZoom = ratio === 100 || ratio === 200
         if (!isNormalZoom) {
             suofang();
         } else {