$(function(){ 
  $("#equipment_grid").jqGrid({
    url:'<%=request.getContextPath()%>/equipment/list/json',
                    datatype : 'json',
                    mtype : 'GET',
                    colNames : [ 'id', 'name', 'ip', 'port', 'username', 'password',
                            'updateTime' ],
                    colModel : [ {
                        name : 'id',
                        index : 'id',
                        jsonmap : 'id',
                        width : 55,
                        editable : true
                        name : 'name',
                        index : 'name',
                        jsonmap : 'name',
                        width : 55,
                        editable : true
                        name : 'ip',
                        index : 'ip',
                        jsonmap : 'ip',
                        width : 90,
                        editable : true
                        name : 'port',
                        index : 'port',
                        jsonmap : 'port',
                        width : 80,
                        align : 'right',
                        editable : true
                        name : 'username',
                        index : 'username',
                        jsonmap : 'username',
                        width : 80,
                        align : 'right',
                        editable : true
                        name : 'password',
                        index : 'password',
                        jsonmap : 'password',
                        width : 80,
                        align : 'right',
                        editable : true
                        name : 'updateTime',
                        index : 'updateTime',
                        jsonmap : 'updateTime',
                        datefmt : 'yyyy-MM-dd HH:mm:ss',
                        formatter : 'date',
                        formatoptions : {
                            newformat : 'Y-m-d H:i:s'
                        width : 150,
                        sortable : false,
                        editable : true
                    pager : '#equipment_pager',
                    rowNum : 10,
                    rowList : [ 10, 20, 30 ],
                    sortname : 'id',
                    sortorder : 'desc',
                    jsonReader : {
                        root : "equipments",
                        page : "page",
                        total : "total",
                        records : "records",
                        repeatitems : false
                    viewrecords : true,
                    caption : '设备列表'
        jQuery("#equipment_grid").jqGrid('navGrid', '#equipment_pager', {
            view : true,
            edit : true,
            add : true,
            del : true
        },{ url: '/equipment/update/{id}', mtype: 'PUT'},
        { url: '/equipment/insert', mtype: 'POST'},
        { url: '/equipment/delete/{id}', mtype: 'DELETE'});
如上代码，请问如何传值能动态替换掉{ url: '/equipment/update/{id}', mtype: 'PUT'}部分里面的｛id｝为colModel的id呢？
                                    
{top: -200, left: 400, reloadAfterSubmit: true, jqModal: false, closeAfterAdd: true,
            onclickSubmit: function(params, postdata) { // add compact_id
                var pid = myGrid.jqGrid('getGridParam','selrow') || opt.actRowid;    // 确保能取到master grid的rowid!
                if (pid <= 0) {
                    alert('请先选择合同!');
                    postdata.id = 0;
                    return {};
                postdata.id = pid;
                return postdata;
            afterComplete: function(response, postdata, formid) {
                myGrid.trigger('reloadGrid'); 
            afterSubmit: function(xhr, postdata) {
                return jqg_form_resp(xhr, postdata, '添加失败!');
        }, // add options
                                      2019-07-17 19:52:10
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