html
<div class="layui-col-xs6">
<div class="header-second-btn">
<div class="header-second-show" id="header-second-show">
家长版
<i class="layui-icon layui-icon-down"></i>
</div>
<div class="header-second-option">
<div>家长版</div>
<div>老师版</div>
</div>
</div>
</div>
js
$(".header-second-show").click(function (e) {
$(".header-second-option").show()
console.log("123");
})
$('html').click(function (e) {
console.log(e);
console.log(e.target.id);
if (e.target.id != 'header-second-show')
$(".header-second-option").hide();
})