需要引入jquery和bootstrap相关包，然后把下面的代码复制进去就可以了：
<div class="modal fade" ></div>
</div>
<h5>loading...</h5>
</div>
</div>
<script>
showLoading = function(){
$('#loadingModal').modal({backdrop: 'static', keyboard: false});
}
hideLoading = function(){
$('#loadingModal').modal('hide');
}
</script>