图条之间的jqplot宽度

seriesDefaults: {
  renderer: $.jqplot.BarRenderer,
  rendererOptions: {
    barPadding: -20
  }
}

seriesDefaults: {
     renderer: $.jqplot.BarRenderer,
     rendererOptions: {                        
           barMargin: 8                        
     }
},

seriesDefaults: { renderer: $.jqplot.BarRenderer, rendererOptions: {
        barWidth: 15
        } },