问如果AJAX请求在前一个请求的5秒内，我如何阻止它？

EN

var last_req = 0;
var limit = 5000; //miliseconds
function send_comment() {
  var time = new Date().getTime();
  if(time-last_req<limit)  {
    alert("Wait please");
    return false;
  }
  last_req = time;
  $.get("comment.php", {/*data*/}, function() {});
}

// declare this globally at the top of your script
var allowAjax = true;


// this would be in some event handler (on enter keypress, for example)
if (allowAjax) {
    $.ajax({
        ...
        ...
    });
} else {
    // show message saying to wait
}

allowAjax = false;

setTimeout(function() {
    allowAjax = true;
}, 5000);