提供给addRows的参数必须是数字或数组--谷歌图表

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

function drawChart() {
  var data = new google.visualization.DataTable();
  data.addColumn('string', 'Year');
  data.addColumn('number', 'Sales');

  data.addRows(3); // 添加3行默认值填充的行

  // 绘制图表
  var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
  chart.draw(data, {width: 400, height: 240});
}

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

function drawChart() {
  var data = new google.visualization.DataTable();
  data.addColumn('string', 'Year');
  data.addColumn('number', 'Sales');

  data.addRows([
    ['2010', 1000],
    ['2011', 1170],
    ['2012', 660],
    ['2013', 1030]
  ]);

  // 绘制图表
  var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
  chart.draw(data, {width: 400, height: 240});
}