Google App Scripts:运行脚本时，不会生成图表输出

  google.charts.load('current', {'packages':['corechart']});

  function drawChart() {
    // 创建数据表对象
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'Task');
    data.addColumn('number', 'Hours');
    data.addRows([
      ['Work', 8],
      ['Sleep', 8],
      ['Eat', 2],
      ['Exercise', 2],
      ['Socialize', 4]
    ]);

    // 设置图表选项
    var options = {
      title: 'Daily Activities',
      pieHole: 0.4
    };

    // 创建图表对象
    var chart = new google.visualization.PieChart(document.getElementById('chart_div'));

    // 绘制图表
    chart.draw(data, options);
  }

  google.charts.setOnLoadCallback(drawChart);