<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"> <title>Directions Widget</title> <link rel="stylesheet" href="http://js.arcgis.com/3.13/dijit/themes/claro/claro.css"> <link rel="stylesheet" href="http://js.arcgis.com/3.13/esri/css/esri.css"> <style> html, body, #map { height:100%; width:100%; margin:0; padding:0; } body { background-color:#FFF; overflow:hidden; font-family:"Trebuchet MS"; } </style> <script src="http://js.arcgis.com/3.13/"></script> <script> require([ "esri/map", "esri/dijit/Directions", "dojo/parser", "dijit/layout/BorderContainer", "dijit/layout/ContentPane", "dojo/domReady!" ], function( Map, Directions,parser ) { parser.parse(); var map = new Map("map", { basemap: "streets", center:[-98.56,39.82], zoom: 4 }); var directions = new Directions({ map: map, routeTaskUrl: "http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Network/USA/NAServer/Route", },"dir"); directions.startup(); }); </script> </head> <body class="claro"> <div data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline', gutters:false" style="100%;height:100%;"> <div data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'right'" style="300px;height:600px;"> <div id="dir"></div> </div> <div id="map" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'"> </div> </div> </body> </html>
parser.parse()：
dojo的parser会把html节点根据所声明的类型（data-dojo-type）转化为相应的dijit组件的template（dojo类型的节点），并且会给这些相应的template赋上对应的id，属性等等，并且把组件的id注册到dijit.registry里。在注册到registry的过程中，如果没有显式的指定id，则registry会生成一个自增的id赋值给相应的组件，如果显式的指定id，则使用指定的id。如果对同一节点多次parse操作，并且这些节点中有指定id的情况，就会出现你说的这种情况，报的错应该是Tried to register widget with id==xxx but that id is already registered。如果想分步加载并且多次parse，可以加载一个节点parse一个节点。或者在代码中调用dijit组件的startup方法也可实现parse的同样效果。
startup（）：