OpenLayers 3:如何设置向量特性的填充样式。

i am trying to set the fill colour of seperate features of a vector layer. using the code below, i thought i would be able to iterate through the features and set their fill style individually, but a strange issue happens. Without the setStyle function, the various properties of the features are logged in the console. id, name and geometry. There is about 5 or so features that get logged. basically likei am trying to set the fill colour of seperate