如何修改jquery easyui select中option背景颜色

<input type="radio" name="b_group" value="2">模板颜色：<select class="easyui-combobox"  name="state" style="width:200px;" 
						 data-options="textField: 'text', 
						              formatter: formatItem">
						    <option value="" selected="selected">==请选择==</option>
							<option value="red">red</option>
							<option value="green">green</option>
							<option value="gray">gray</option>
							<option value="yellow">yellow</option>
							<option value="blue">blue</option>
							<option value="aqua">aqua</option>
							<option value="purple">purple</option>
							<option value="fuchsia">fuchsia</option>
						</select><br/><br/>
						<script type="text/javascript">
						        function formatItem(row){
					                    var s = '<div style="background-color:'+row.text+'";>' + row.text + '</div>';
					                     return s;       
						         }
						</script>

转自：https://blog.csdn.net/zhengbo0/article/details/10325497

<input class="easyui-combobox" id="approvalOrder" style="width:100px" data-options="
                    valueField:'id',
                    textField:'name',
                    editable:false,
                    value:'-5',
                    formatter: function(row){
                        var opts = $(this).combobox('options');
                        if(row[opts.textField]=='已提交'){
                            return '<span style=\'background:#C7C7E2\'>'+row[opts.textField]+'<\/span>';
                        }else if(row[opts.textField]=='审批中'){
                            return '<span style=\'background:#00FF7F\'>'+row[opts.textField]+'<\/span>';
                        }else if(row[opts.textField]=='已退回'){
                            return '<span style=\'background:#EE6363\'>'+row[opts.textField]+'<\/span>';
                        }else if(row[opts.textField]=='已归档'){
                            return '<span style=\'background:#81C0C0\'>'+row[opts.textField]+'<\/span>';
                        }else if(row[opts.textField]=='全部'){
                            return '<span style=\'background:#E5E5E5\'>'+row[opts.textField]+'<\/span>';
                        }
                    },
                    data:[
                        {id:'-1',name:'已提交'},
                        {id:'-4',name:'审批中'},
                        {id:'-2',name:'已退回'},
                        {id:'-3',name:'已归档'},
                        {id:'-5',name:'全部'}
                    ]
                ">