如何知道 javascript require 标签的哪一部分添加我的函数？

Question

您好，我正在尝试为我的地图添加定位按钮，但我不知道要在 require 标记中添加 javascript 代码的哪一部分。例如在 esri/dijit/Legend 之后还是什么？下面是我的代码。

 <script>
    require([
      "dojo/parser",
      "dojo/ready",
      "dijit/layout/BorderContainer",
      "dijit/layout/ContentPane",
      "dojo/dom",
      "esri/map",
      "esri/urlUtils",
      "esri/arcgis/utils",
      "esri/dijit/Legend",
      "esri/dijit/Scalebar",
      "dojo/domReady!"
    ], function (
      parser,
      ready,
      BorderContainer,
      ContentPane,
      dom,
      Map,
      urlUtils,
      arcgisUtils,
      Legend,
      Scalebar
    ) {
        ready(function () {

            parser.parse();

            //if accessing webmap from a portal outside of ArcGIS Online, uncomment and replace path with portal URL
            //arcgisUtils.arcgisUrl = "http://pathto/portal/sharing/content/items";
            arcgisUtils.createMap("7f975854312c4ca9a50aa5933c4a782e", "map").then(function (response) {
                //update the app
                dom.byId("title").innerHTML = response.itemInfo.item.title;
                dom.byId("subtitle").innerHTML = response.itemInfo.item.snippet;

                var map = response.map;

                //add the scalebar
                var scalebar = new Scalebar({
                    map: map,
                    scalebarUnit: "english"
                });

                //add the legend. Note that we use the utility method getLegendLayers to get
                //the layers to display in the legend from the createMap response.
                var legendLayers = arcgisUtils.getLegendLayers(response);
                var legendDijit = new Legend({
                    map: map,
                    layerInfos: legendLayers
                }, "legend");
                legendDijit.startup();
            });
        });
    });
</script>

Answer 1

您可以按任何顺序将项目添加到 require 数组中，但有两个注意事项：

您必须以相同的顺序在函数参数列表中添加模块 return 值
它必须位于您未在函数参数中包含 return 值的任何项目之前，除非您也不需要它的 return 值

所以，换句话说......不要把它放在 domReady 之后！因为函数参数中没有 return 值。比如放在ScaleBar和domReady之间，然后在函数参数中的ScaleBar后面加上return值：

require([
  "dojo/parser",
  "dojo/ready",
  "dijit/layout/BorderContainer",
  "dijit/layout/ContentPane",
  "dojo/dom",
  "esri/map",
  "esri/urlUtils",
  "esri/arcgis/utils",
  "esri/dijit/Legend",
  "esri/dijit/Scalebar",
  "esri/dijit/LocateButton",            <-- Here
  "dojo/domReady!"
], function (
  parser,
  ready,
  BorderContainer,
  ContentPane,
  dom,
  Map,
  urlUtils,
  arcgisUtils,
  Legend,
  Scalebar,
  LocateButton                          <-- Here
) {

但如前所述，顺序并不重要。您可以将它作为 require 数组中的第一项，只要它也是函数参数列表中的第一项。

如何知道 javascript require 标签的哪一部分添加我的函数？

How to know which part of the javascript require tag to add my function in?

javascript

html

arcgis

esri

arcgis-js-api