因此，我猜想完成键入意味着您只需停顿一会儿，例如5秒钟。因此，请记住，让我们在用户释放按键时启动计时器，并在用户按下按键时将其清除。我决定有问题的输入将是#myInput。

做一些假设…

//setup before functions
var typingTimer;                //timer identifier
var doneTypingInterval = 5000;  //time in ms, 5 second for example
var $input = $('#myInput');

//on keyup, start the countdown
$input.on('keyup', function () {
  clearTimeout(typingTimer);
  typingTimer = setTimeout(doneTyping, doneTypingInterval);
});

//on keydown, clear the countdown 
$input.on('keydown', function () {
  clearTimeout(typingTimer);
});

//user is "finished typing," do something
function doneTyping () {
  //do something
}