在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<script>
i=0;
$(document).ready(function(){
  $("p").keypress(function(){
    $("span").text(i+=1);
  });
  $("button").click(function(){
    $("p").keypress();
  });
});
</script>
</head>
<body>

<p>Keypresses: <span>0</span></p>
<button>Trigger the keypress event</button>

</body>
</html>

源代码

动行结果