SharePoint get current user information

	function getCurrentUserInfo() {
	SP.SOD.executeFunc("SP.js", "SP.ClientContext", function () {
	var objctx = SP.ClientContext.get_current();
	var user = objctx.get_web().get_currentUser();
	objctx.load(user);
	objctx.executeQueryAsync(function() {
	alert([user]);
	}, function() {
	alert('Error....');
	});
	});
	}

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