Javascript 延迟

timeout.js

//Call a javascript function after 5 sec of last key press

var timeout;
$(document).ready(function(){
  $('input[type=text]').keypress(function() {
      if(timeout) {
          clearTimeout(timeout);
          timeout = null;
      }
      timeout = setTimeout(myFunction, 5000);
  });
});

var myFunction = new function() { 
  alert('myFunction is running');
  clearTimeout(timeout); // this way will not run infinitely
}