使用plus.nativeObj.View绘制矩形怎么设置阴影

var view = new plus.nativeObj.View('popup',{width:'94%',height:'60px',top:'25px',left:'3%',right:'3%');
view.draw([
{tag:'rect',id:'rect',rectStyles:{color:'#ffffff',borderColor:'#eeeeee',borderWidth:'1px',radius:'5px',},position:{top:'0px',left:'0px',width:'100%',height:'100%'}},
]);
view.show();

如何设置rect的阴影效果？