Pull request #3151: KERNEL-13158: 优化useContext

Merge in VISUAL/fineui from ~GUY/fineui:master to master

* commit '6507dd2d34f95103cecf82d3cdf5b6adb0f2aed7':
  KERNEL-13158: 优化useContext

src/core/constant/var.js

@@ -19,8 +19,8 @@ BI._.extend(BI, {
         if (!BI.isNumber(pix)) {
             return pix;
         }
-        if (BI.pixUnit === "px" && BI.pixRatio === 1) {
+        if (BI.pixUnit === "px") {
-            return (pix - (border || 0)) / BI.pixRatio + BI.pixUnit;
+            return (pix - (border || 0)) / BI.pixRatio;
         }
         var length = pix / BI.pixRatio + BI.pixUnit;
         if (border > 0) {