<body>
<button class="btn">按钮</button>
<button class="btn">按钮</button> <button class="btn">按钮</button> <button class="btn">按钮</button> <button class="btn">按钮</button> <button class="btn">按钮</button><script>
(function($){ $.fn.extend({ sort:function(){ var i=1; $(this).each(function(){ var oldhtml=$(this).html(); $(this).html(oldhtml+i); i++; }) } }) })(jQuery);$(".btn").sort();
</script>
</body>
</html>