chore: 优化一下

src/case/linersegment/linear.segment.js

@@ -18,6 +18,7 @@ BI.LinearSegment = BI.inherit(BI.Widget, {
                 height: o.height - 1
             }),
             layouts: o.layouts,
+            value: o.value,
             listeners: [{
                 eventName: "__EVENT_CHANGE__",
                 action: function () {
@@ -48,4 +49,4 @@ BI.LinearSegment = BI.inherit(BI.Widget, {
         return this.buttonGroup.getValue();
     }
 });
-BI.shortcut("bi.linear_segment", BI.LinearSegment);
+BI.shortcut("bi.linear_segment", BI.LinearSegment);