需求是图标有hover效果 ，如下
思路 ：
1、创建图片标记，并赋值；
args.rendererArgs = new RenderArgs();
args.rendererArgs.type = RenderType.CLASSBREAKS;
args.rendererArgs.attributeField = "value";
var symbolNormal = new PictureMarkSymbolArgs();
symbolNormal.url = getMapImageIcon(remoteMeterName,"0");
symbolNormal.height = 40;
symbolNormal.width = 40;
symbolNormal.xoffset = 0;
symbolNormal.yoffset = 0;
args.rendererArgs.symbols.push(symbolNormal); var symbolNormalFocus = new PictureMarkSymbolArgs();
symbolNormalFocus.url = getMapImageIcon(remoteMeterName,"1");
symbolNormalFocus.height = 40;
symbolNormalFocus.width = 40;
symbolNormalFocus.xoffset = 0;
symbolNormalFocus.yoffset = 0;
args.rendererArgs.symbols.push(symbolNormalFocus); var symbolNormalLight = new PictureMarkSymbolArgs();
symbolNormalLight.url = getMapImageIcon(remoteMeterName, "2"); //正常高亮图标
symbolNormalLight.height = 40;
symbolNormalLight.width = 40;
args.rendererArgs.symbols.push(symbolNormalLight); var symbolAlarmLight = new PictureMarkSymbolArgs();
symbolAlarmLight.url = getMapImageIcon(remoteMeterName, "3"); //报警高亮图标
symbolAlarmLight.height = 40;
symbolAlarmLight.width = 40;
args.rendererArgs.symbols.push(symbolAlarmLight); args.rendererArgs.values.push(0);
args.rendererArgs.values.push(0.9);
args.rendererArgs.values.push(1.9);
args.rendererArgs.values.push(2.9);
args.rendererArgs.values.push(3.9);
2、在创建图层的时候写入mouse-over事件，并修改移入时的velue值；并刷新图层；完成。
layer.on("mouse-over", lang.hitch(this, function (evt) {
dijitPopup.close(dialog);
var g = evt.graphic;
if(g.attributes.value=="0"){
g.attributes.value = "2";
layer.refresh();
}else if(g.attributes.value=="1"){
g.attributes.value = "3";
layer.refresh();
}
}））