话不多说直接上代码

在页面中引入如下代码

<link rel="stylesheet" href="/template/admin/layui-v2.5.6/css/layui.css">
<script type="text/javascript" src="/template/admin/layui-v2.5.6/layui.js"></script>
<script type="text/javascript" src="/template/admin/iconPicker/iconPickerFa.js"></script>

第二步html页面如图

<div class="form-group"><label class="col-sm-2 control-label">选择图标</label><div class="col-sm-3"><input type="text" id="icon" name="menu[icon]" lay-filter="icon" class="hide" value="fa fa-list"></div>
</div>

第三步如图代码

<script>layui.use(['form', 'upload', 'jquery','table'], function() {var form = layui.form,upload = layui.upload,iconPickerFa = layui.iconPickerFa,$ = layui.jquery;var table = layui.table;var iconLess="/template/admin/font-awesome-4.7.0/less/variables.less"iconPickerFa.render({elem: '#icon',url: iconLess,limit: 12,click: function (data) {$('#icon').val('fa ' + data.icon);},success: function (d) {console.log(d);}});})
</script>

最终呈现如下图

layui iconPicker插件下载地址