Js控制css实现同一个按钮实现展示与隐藏内容（LayUI）

<button class="layui-btn layui-btn-primary layui-col-md-offset8" lay-active="dropDownContent">
<i class="layui-icon layui-icon-app layui-bg-white"></i>
</button>

<div class="layui-row" style="display:none;" id="downCent">
展示隐藏内容
</div>

layui.use(["util", "dropdown"], function () {

let util=layui.util;

util.event('lay-active', {
dropDownContent: function () {
var div = document.getElementById("downCent");
if (div.style.display != "none") { div.style.display = "none"; }
else { div.style.display = "block"; }

}

});

 });