<div data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline',gutters:false"> <div data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'left', splitter:'true'" style="background-color: rgb(220, 245, 233); width: 270px;"> <h3>&nbsp&nbsp&nbsp&nbsp&nbsp功能区</h3> </div> <div id="viewDiv" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'" style="background-color: #ffffff; padding: 0;"> </div> </div>如何改良这段代码，使功能区与viewDiv之间平滑过渡

可以尝试给 `BorderContainer` 添加一个 `dijit/BackgroundIframe`，这样可以解决两个区域之间的过渡问题，代码如下：

<div data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline',gutters:false">     
    <div data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'left', splitter:'true', style:{backgroundColor: 'rgb(220, 245, 233)', width: '270px'}">         
        <h3>&nbsp&nbsp&nbsp&nbsp&nbsp功能区</h3>     
    </div>     
    <div id="viewDiv" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center', style:{backgroundColor: '#ffffff', padding: '0'}">         
    </div>
    <iframe src="javascript:''" class="dijitBackgroundIframe" style="position: absolute; width: 100%; height: 100%; top: 0; left: 0; z-index: -1;"></iframe>
</div>

其中，`dijitBackgroundIframe` 的作用是让两个区域之间的过渡更加平滑。