How to add values to “Person or Group” list column using JavaScript

	var clientContext;
	SP.SOD.executeFunc("sp.js", 'SP.ClientContext', function () {
	clientContext = new SP.ClientContext.get_current();
	var oWeb = clientContext.get_web();
	var strUserName = _spPageContextInfo.userLoginName;
	var listName = "MyList";
	if (strUserName) {
	var oUser = new Array();
	oUser.push(SP.FieldUserValue.fromUser(strUserName.substring(0, strUserName.indexOf("@"))));
	var oList = oWeb.get_lists().getByTitle(listName);
	var itemCreateInfo = new SP.ListItemCreationInformation();
	var oListItem = oList.addItem(itemCreateInfo);
	oListItem.set_item('UserName', oUser);
	oListItem.update();
	clientContext.executeQueryAsync(onQuerySucceeded, onQueryFailedInsert);
	}
	});
	onQuerySucceeded = function (response) {
	console.log('success');
	}
	onQueryFailedInsert = function (sender, args) {
	console.log('failure');
	}

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