bootstrap改变按钮加载状态

<button type="button" id="myButton" data-loading-text="Loading..." class="btn btn-primary" autocomplete="off">
  Loading state
</button>

<script>
  $('#myButton').on('click', function () {
    var $btn = $(this).button('loading')
    // business logic...
    $btn.button('reset')
  })
</script>

<script>
//用于微笑话登陆按钮以及审稿按钮改变按钮加载状态
    function loag() {
      var btn = $("#btn_login");
      btn.button('loading');
      setTimeout(function () { btn.button('reset'); },2000);
    }
</script>
 <button type="button" class="btn btn-default" data-loading-text="Loading..." autocomplete="off" onclick="loag()" id="btn_login">登陆</button>