首先去下面这个链接下载layui的layarea扩展

https://fly.layui.com/extend/layarea/

下载下来后将压缩包里mods文件夹下的layarea.js文件移入到你的layui/lay/modules目录下

然后在layui.js文件里添加一句

然后就可以正常使用了

html部分

<div class="layui-form-item" id="area-picker">
                            <label class="layui-form-label">违法地点</label>
                            <div class="layui-input-inline" style="width: 16%; margin-left: 10px">
                                <select name="province" class="province-selector" data-value="" lay-filter="province-1">
                                    <option value="">请选择省</option>
                                </select>
                            </div>
                            <div class="layui-input-inline" style="width: 16%; margin-left: 0;">
                                <select name="city" class="city-selector" data-value="" lay-filter="city-1">
                                    <option value="">请选择市</option>
                                </select>
                            </div>
                            <div class="layui-input-inline" style="width: 15%; margin-left: 0;">
                                <select name="county" class="county-selector" data-value="" lay-filter="county-1">
                                    <option value="">请选择区</option>
                                </select>
                            </div>
                            <div class="layui-input-inline" style="width: 41%; margin: 0;">
                                <input type="text" class="layui-input" name="detailedAddress" id="detailedAddress" placeholder="请输入详细地址" autocomplete="off"/>
                            </div>
                        </div>

js部分

layui.use(['layer', 'layarea'], function() {
    var layer = layui.layer,
         layarea = layui.layarea;

    layarea.render({
            elem: '#area-picker',
            data: {
                province: '河北省',
                city: '石家庄市',
                county: '桥西区',
            },
            change: function (res) {
                //选择结果
                console.log(res);
            }
     });
})