this is not the very clean and smart way but its very easy to understand and use somtimes - its like odd and even - boolean like:
var moreOrLess = 2;
$('.Btn').on('click',function(){
if(moreOrLess % 2 == 0){
$(this).text('text1');
moreOrLess ++ ;
}else{
$(this).text('more');
moreOrLess ++ ;
}
});