在ng2 charts的柱状图组件中，可以通过设置options属性中的barPercentage和barThickness来调整相邻两个柱状条之间的间距。具体代码示例如下：

html文件：

ts文件：

import { Component } from '@angular/core';

@Component({
  selector: 'app-bar-chart',
  templateUrl: './bar-chart.component.html',
  styleUrls: ['./bar-chart.component.css']
})

export class BarChartComponent {
  public barChartOptions: any = {
    scaleShowVerticalLines: false,
    responsive: true,
    barPercentage: 0.5, // 设置相邻两个柱状条之间的间距
    barThickness: 20 // 设置柱状条的宽度
  };
  public barChartLabels: string[] = ['January', 'February', 'March', 'April', 'May', 'June', 'July'];
  public barChartType = 'bar';
  public barChartLegend = true;

  public barChartData: any[] = [
    {data: [65, 59, 80, 81, 56, 55, 40], label: 'Series A'},
    {data: [28, 48, 40, 19, 86, 27, 90], label: 'Series B'}
  ];

  public chartClicked(e: any): void {
    console.log(e);
  }

  public chartHovered(e: any): void {
    console.log(e);
  }
}