var _timer = {}; 
function delay_till_last(id, fn, wait) { 
 if (_timer[id]) { 
  window.clearTimeout(_timer[id]); 
  delete _timer[id]; 
 } 
 
 return _timer[id] = window.setTimeout(function() { 
  fn(); 
  delete _timer[id]; 
 }, wait); 
} 

$dom.on('click', function() { 
 delay_till_last('id', function() {//注意 id 是唯一的 
  //响应事件 
 }, 300); 
}); 

<input type="button" value="Click" id="subBtn"/> 
<script type="text/javascript"> 
function myFunc(){ 
 //code 
 //执行某段代码后可选择移除disabled属性，让button可以再次被点击 
 $("#subBtn").removeAttr("disabled"); 
} 
$("#subBtn").click(function(){ 
 //让button无法再次点击 
 $(this).attr("disabled","disabled"); 
 //执行其它代码，比如提交事件等 
 myFunc(); 
}); 
</script>