ArcGIS API for JavaScript 需要在DoJo中加载的资源

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The amount of Dojo you use when you work with the ArcGIS API for JavaScript is up to you, but at a minimum you'll need to use several common functions:

dojo.require: Similar to the <script> include tag on an HTML page. It imports resources into your JavaScript page.
```
// AMD
require(["esri/map", ... ], function(Map, ... ){ ... });

// legacy
dojo.require("esri.map");
```
For the JavaScript API, the most commonly imported resources are:
ResourceUse for:esri.mapMap, geometry, graphics, and symbolsesri.layers.agsdynamicArcGISDynamicMapServiceLayeresri.layers.agstiledArcGISTiledMapServiceLayeresri.tasks.findFind taskesri.tasks.geometryGeometry taskesri.tasks.gpGeoprocessing taskesri.tasks.identifyIdentify taskesri.tasks.locatorLocator taskesri.tasks.queryQuery taskesri.toolbars.drawDrawesri.toolbars.navigationNavigation

dojo.ready (or dojo.addOnLoad): Similar to <body onload="">. It registers an initializing block after the page has finished loading.

// legacy
dojo.ready(init);

// AMD
require(["dojo/ready"], function(ready){
  ready(function(){
    // This function won't run until the DOM has loaded and other modules that register have run.
  });
});

dojo.connect: Similar to Element.addEventListener and Element.attachEvent JavaScript functions. It registers a listener to listen to specific events on an Object or element on the page and returns results from a function.
```
// legacy
dojo.connect(myMap, "onLoad", myLoadHandler);

// AMD
require(["esri/map", "dojo/on"], function(Map, on) {
  // ...
  on(myMap, "load", callback);
});
```
dojo.byId: Similar to the document.getElementById(id) JavaScript function. The function searches and returns the first HTML element with the argument ID.
```
dojo.byId("myInputField").value = myMap.id; 
```
dojo array extras: refer to the Arrays Made Easy tutorial on dojotoolkit.org

When writing your ArcGIS JavaScript applications, you can take advantage of the full Dojo toolkit, which includes buttons, grids, tree views, charts, and other widgets. The toolkit is divided into three parts:

Core - Essential functions like those listed above
Dijit - Themeable widgets such as trees, menus, and buttons
DojoX- Extension projects in various stages of development, such as graphics, grids, and charts

As stated previously, you can start building ArcGIS API for JavaScripts apps with minimal dojo knowledge. But, the more dojo you know, the more you'll be able to accomplish. Dojotoolkit.org's tutorials and documentation are a fantastic place to start.

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