为什么我在谷歌的图表自己的参考示例中得到'google is not defined'?



我是这个主题的新手,并遵循以下建议:

https://developers.google.com/chart/interactive/docs/quick_start

它告诉我,我们可以在那里进行以下代码段,将其经过文件,用HTML扩展名保存,然后在浏览器中查看饼图。不幸的是它不起作用。

JavaScript调试器说'loader.js:1 uck offfick syntaxerror:无效或意外的令牌'紧随其后的是,毫不奇怪,'未介绍的参考文献:Google未在test1.html上定义:8'

<html>
  <head>
    <!--Load the AJAX API-->
    <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
    <script type="text/javascript">
      // Load the Visualization API and the corechart package.
      google.charts.load('current', {'packages':['corechart']});
      // Set a callback to run when the Google Visualization API is loaded.
      google.charts.setOnLoadCallback(drawChart);
      // Callback that creates and populates a data table,
      // instantiates the pie chart, passes in the data and
      // draws it.
      function drawChart() {
        // Create the data table.
        var data = new google.visualization.DataTable();
        data.addColumn('string', 'Topping');
        data.addColumn('number', 'Slices');
        data.addRows([
          ['Mushrooms', 3],
          ['Onions', 1],
          ['Olives', 1],
          ['Zucchini', 1],
          ['Pepperoni', 2]
        ]);
        // Set chart options
        var options = {'title':'How Much Pizza I Ate Last Night',
                       'width':400,
                       'height':300};
        // Instantiate and draw our chart, passing in some options.
        var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <!--Div that will hold the pie chart-->
    <div id="chart_div"></div>
  </body>
</html>

那么,为什么这个完全开箱即用的标准示例不起作用?在这个示例中有些过时吗?

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