easyui combobox 多选及全选 功能

效果如下：

 代码如下：

$("#DepartmentCode").comboex({
        data: [{
            "value": "",
            "text": "全部"
        },
        {
            "value": "001",
            "text": "部门1"
        },
        {
            "value": "002",
            "text": "部门2"
        },
        {
            "value": "003",
            "text": "部门3"
        }],
        valueField: 'value',
        textField: 'text',
        panelHeight: 200,
        editable: false,
        multiple: true,
        onLoadSuccess: function (record) {
            if (comboboxParams == null) {
                comboboxParams = PTLocalStorage.get(window.document.URL, false);
            }
            if (comboboxParams) {
                var tmpPara = comboboxParams.state;
                if (tmpPara && tmpPara != "") {
                    $(this).comboex('setValues', tmpPara);
                }
            }
        }
    });