原来在加载图层的时候,可以指定图片格式,默认是png8,指定为jpg后就可以了
引用
var imageParameters = new ImageParameters();
imageParameters.format = "jpeg"; //set the image type to PNG24, note default is PNG8.
//Takes a URL to a non cached map service.
var dynamicMapServiceLayer = new ArcGISDynamicMapServiceLayer("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Population_World/MapServer", {
"opacity" : 0.5,
"imageParameters" : imageParameters
});
imageParameters.format = "jpeg"; //set the image type to PNG24, note default is PNG8.
//Takes a URL to a non cached map service.
var dynamicMapServiceLayer = new ArcGISDynamicMapServiceLayer("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Population_World/MapServer", {
"opacity" : 0.5,
"imageParameters" : imageParameters
});