向google gauge bottom标签添加后缀可防止其更改

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

function drawChart() {
  var data = google.visualization.arrayToDataTable([
    ['Label', 'Value'],
    ['Memory', 80],
    ['CPU', 55],
    ['Network', 68]
  ]);

  var options = {
    width: 400, height: 120,
    redFrom: 90, redTo: 100,
    yellowFrom:75, yellowTo: 90,
    minorTicks: 5,
    gauge: {
      suffix: '%' // 后缀内容为百分号
    }
  };

  var chart = new google.visualization.Gauge(document.getElementById('chart_div'));

  chart.draw(data, options);
}