JAVASCRIPT

toggle text jquery

$("button").click(function(){
  $(this).text($(this).text() == 'Show' ? 'Close' : 'Show');
});

jquery toggle text on click

$(function(){
   $(".pushme").click(function () {
      $(this).text(function(i, text){
          return text === "PUSH ME" ? "DON'T PUSH ME" : "PUSH ME";
      })
   });
})