简单粗暴，直接上代码！！！（3.23的API）
补充：/shaoms/ArcGIS-API-for-JavaScript/tree/master/Print 这里面有我写的4.xapi打印功能
<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no"><title>地图打印</title><link rel="stylesheet" href="/3.23/dijit/themes/claro/claro.css"><link rel="stylesheet" href="/3.23/esri/css/esri.css"><script src="/3.23/"></script><link rel="stylesheet" type="text/css" href="../css/mystyle.css" /><script>require(["esri/layers/ArcGISDynamicMapServiceLayer","esri/map","esri/config","esri/tasks/PrintTask", "esri/tasks/PrintTemplate", "esri/tasks/PrintParameters", "dojo/domReady!"], function(ArcGISDynamicMapServiceLayer, Map, esriConfig, PrintTask, PrintTemplate, PrintParameters){var lyr = new ArcGISDynamicMapServiceLayer("/server/rest/services/test/22/MapServer"); var mymap = new Map("viewDiv", {basemap: "osm",zoom: 9, center: [116.402544,39.915378] });mymap.addLayer(lyr);var button = document.getElementById("button"); button.onclick = function(){var printTask = new PrintTask(":6443/arcgis/rest/services/Utilities/PrintingTools/GPServer/Export%20Web%20Map%20Task"); var template = new PrintTemplate(); template.exportOptions = { width: 800, height: 600, dpi: 96 }; template.format = "PDF"; template.layout = "A3 Portrait"; template.preserveScale = false; var params = new PrintParameters(); params.map = mymap; params.template = template; printTask.execute(params, function(evt){console.log(evt);window.open(evt.url,"_blank"); //在新的标签页打开打印连接}); } });</script></head><body><div id="viewDiv"></div><button id="button" title="打印">打印</button></body></html>
值得注意的是打印的地图服务需要公有的（共享给everyone），因为通过打印服务工具来间接访问地图服务时，需要用token，此token都是通过map中服务的token直接传递过来。你也可以打印包含受保护服务的地图，详细操作见下面的连接：
/zh-cn/server/10.3/create-web-apps/windows/printing-maps-that-contain-secured-services.htm
