Laravel中用Ajax传值出现“CSRF token mismatch.”

原始代码

<input type="text" onchange="changeOrder()" class="order" value="{{ $category->cate_order }}"> </td>

<script type="text/javascript">
  function changeOrder(){
    $.post("{{ url('admin/category/changeorder') }}",{},function(data){

    });
  }
</script>

修改jquery，传入token值

<script type="text/javascript">
  function changeOrder(){
    $.post("{{ url('admin/category/changeorder') }}",{'_token':"{{ csrf_token() }}"},function(data){

    });
  }
</script>