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arcgis for js 4.9 调用WMS出现服务超时

var wmsLayer = new WMSLayer({
url:url1,
sublayers:[
{
name:"CGCS2000"
}
],
spatialReferences:[4490],
imageFormat:"image/jpeg"
})

url:url1 是wms的地址
name:"CGCS2000" 是图层名
https://developers.arcgis.com/javascript/latest/api-reference/esri-layers-WMSLayer.html#imageFormat
https://developers.arcgis.com/javascript/latest/api-reference/esri-layers-support-WMSSublayer.html
这上面例子似乎不完整，能否提供详细例子，谢谢！