sharepoint - send email use rest-api

function SendEmail(from, to, cc, body, subject) {
	    var urlTemplate = _spPageContextInfo.webAbsoluteUrl + "/_api/SP.Utilities.Utility.SendEmail";
	    var formDigest = $("#__REQUESTDIGEST").val();
		return $.ajax({
	        contentType: 'application/json',
	        url: urlTemplate,
	        type: 'POST',
	        data: JSON.stringify({
	            'properties': {
	                '__metadata': { 'type': 'SP.Utilities.EmailProperties' },
	                'From': from,
	                'To': { 'results': [to] },
	                'Subject': subject,
	                'Body': body
	            }
	    	}),
	        headers: {
	            "Accept": "application/json;odata=verbose",
	            "content-type": "application/json;odata=verbose",
	            "X-RequestDigest": formDigest
	        }
	    }).then(function (data) {
		    console.log(data);
		},function (data) {
		    //alert(JSON.stringify(err));
		    console.log(data);
    	});
	}

sendEmailToCategoryOwner:function(){
                	var from = this.currentUserEmail;
                	var body = "<div style='font-family:\"Times New Roman\";'>"+
		                     "<p style='font-size:16px'>Dear xxx,</p>"+ 
		                     "<p style='font-size:16px'>The Project - " + this.infoForm.projectName + " has been submitted in xxx pending for your review & approval.</p>"+ 
		                     "<p style='font-size:16px'>Please login <a href='https://xxx.aspx?itemId="+ this.currentId +"'><i style='font-size:16PX;color:#0066CC;font-style:normal'>xxx</i></a> to check it.</p>"+ 
		                     "<p style='font-size:16px'>Thanks!</p>"+ 
	                      "</div>";
                	var subject = "Approver reminder";
                	SendEmail(from,to,'',body,subject));
}