Another example

example3.js

var ICU = mw.util.addPortletLink("p-cactions", "#", "ICU", "medium-blog-post", "Add an ICU tag to this article", null, "#ca-move");
$(ICU).click(Tag);

function Tag()
{
	var params = {
		action: 'edit',
		title: mw.config.get('wgPageName'),
		prependtext: '{{ICU|~~' + '~~' + '~}}',
		summary: 'Adding ICU tag to article',
		minor: true
	},
	api = new mw.Api();
	api.postWithToken( 'csrf', params ).done( function ( data ) {
	console.log( 'ICU\'d succesfully.' );
	mw.notify('ICU complete!')
} );
	
}