我們?cè)谑褂肁rcGIS Javascript? API開發(fā)時(shí)，最開始要先加載模塊：

<script>require(["esri/map", "dojo/domReady!"], function(Map) {// code to create the map and add a basemap will go here}); </script>

這里有個(gè)dojo/domReady!，另外Dojo還有一個(gè)dojo/ready，這倆有啥區(qū)別呢，esri官網(wǎng)上有這么一段：

The difference between?domReady?and?ready?is that the former waits to fire the callback provided to?require?until the DOM is available while the latter waits for the DOM to be ready?and?waits for all outstanding require calls to finish. For more information, see the?Dojo documentation for dojo/ready. In simple cases,?dojo/domReady!?should be used. If an app uses?parseOnLoad: true, Dojo Dijits, widgets from the Esri library or custom dijits,?dojo/ready?should be used.

翻譯過來就是，domReady是等待所有DOM元素加載完成，再require相關(guān)模塊；而ready是等待DOM元素加載以及require的相關(guān)模塊全部加載完成。在一些簡(jiǎn)單應(yīng)用場(chǎng)景，用dojo/domReady!就行了；如果應(yīng)用里需要用到一些組件，微件之類的還是用dojo/ready.

總結(jié)

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