easyui datagrid 列宽自适应

$('#htqjbxx').datagrid({
        url:'/api/bsat/findByParamEzuiForBsat',
        nowrap: true,
        fitColumns: true,
        scrollbarSize:0,
        striped: true,
        rownumbers: true,
        pagination: true,
        singleSelect: false,
        pageNumber: 1,
        pageSize: 10,
        pageList: [10, 20, 30, 40, 50],
        height: '100%',
        width: '100%',
        columns: [[
            {field: 'check_box', checkbox: true},
            {field: 'bsatCode', title: '型号代号', width: 100, align: 'center'},
            {field: 'bsatName', title: '型号代号(一院)', width: 100, align: 'center'},
            {field: 'bsatOutsideName', title: '对外名称', width: 100, align: 'center'},
            {field: 'bsatLaunchTime', title: '发射时间', width: 100, align: 'center'},
            {field: 'bsatLifeyear', title: '考核寿命', width:100, align: 'center'},
            {field: 'bsatActive', title: '状态', width:100, align: 'center'},
            {field: 'bsatAdminSubsId', title: '责任人', width:100, align: 'center'},
            {field: 'zrrdh', title: '责任人电话', width:100, align: 'center'},
            {field: 'bsatAdminId', title: '代替人', width:100, align: 'center'},
            {field: 'tdrdh', title: '代替人电话', width:100, align: 'center'},
            {field: 'bsatBxhzcdwId', title: '在轨型号责任联系人', width:100, align: 'center'},
            {field: 'bsatBxhzcdwId', title: '在轨技术/支持队伍', width:100, align: 'center'}
        ]]
    });