------------------------------------正常加载----------------------------------------
<--正常加载-->
<div id="loading">
            <img src="//static.360buyimg.com/bus/web2017/bwb3.0/web/images/loading.gif">
        </div>

------------------------------------按钮加载----------------------------------------
<--按钮加载-->
<button class="wb-btn-l wb-btn-red"><img src="//static.360buyimg.com/bus/web2017/bwb3.0/web/images/loading_white_s.gif " width="16" height="16">立即发布</button>

------------------------------------局部请求加载----------------------------------------
<--局部请求加载-->
<div class="loading">
            <img src="//static.360buyimg.com/bus/web2017/bwb3.0/web/ images/loading_gray_m.gif" alt="" class = "mr5"/>正在加载
        </div>