Initial position and state of map restoration in Webgis

I want to achieve an effect: when the map is arbitrarily scaled, clicking on a button will immediately return to the location where the map was initially loaded, and there is no scaling state.

How to do it. The best way is to use the home button.

<! DOCTYPE html>  
With another button is not a problem:


var mapcenter = new Point ([+], new Spatialreference ({wkid:4326}));
  Map = new Map ("map", {
    basemap: "Delorme",
    Center:mapcenter,
    maxzoom:10,  
    minzoom:1,  
    Zoom:5,
    extent:bounds,
    logo:false,
    nav:false
  });
  var HomeClick = function () {
      map.centerandzoom (mapcenter,5);  
  }  
 
Be sure to set the Basemap, otherwise this scaling is difficult to achieve results.