[ruslan_mart]

(function() {
     var startTime = new Date().getTime();

     function timer() {
          console.log(true);
     };

     document.body.onmousemove = function() {
          var time = new Date().getTime();
          if(time - startTime >= 300) {
              startTime = time;
              timer();
          }
     };
})();