SOURCE

$("#btn").click(function(){
  	console.log(1);
    $(this).attr({"disabled":"disabled"});
    $(this).addClass("btn_disable");
  	$(this).attr({"value":"我已禁用"});
});

<script src="http://www.jq22.com/jquery/jquery-2.1.1.js"></script>
<input id="btn" type="button" value="点我禁用" class="mybtn" />

.mybtn{
  display:block;
  background-color:#ff0000;
  border:none;
  color:#fff;
}
.btn_disable{
    background-color:#d4d4d4;
    color:#fff;
}