ArcGIS for JS Argus map limits the display of specific areas


ArcGIS map services restrict specific areas and mask other maps that are not displayed

Method 1: using canvasclearRectMethod to achieve the effect of hollowing out
Method 2: using the path of canvas to achieve the effect of hollowing out

Clearrect method:

        var c=document.getElementById("myCanvas");
        var ctx=c.getContext("2d");

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