谷歌折線圖JSON格式

Question

我想要遵循Google文檔中的創建材質折線圖示例，但我無法確定折線圖使用的JSON格式。我如何顯示DataTable對象的JSON？

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

function drawChart() { 

    var data = new google.visualization.DataTable(); 
    data.addColumn('number', 'Day'); 
    data.addColumn('number', 'Guardians of the Galaxy'); 
    data.addColumn('number', 'The Avengers'); 
    data.addColumn('number', 'Transformers: Age of Extinction'); 

    data.addRows([ 
    [1, 37.8, 80.8, 41.8], 
    [2, 30.9, 69.5, 32.4], 
    [3, 25.4, 57, 25.7], 
    [4, 11.7, 18.8, 10.5], 
    [5, 11.9, 17.6, 10.4], 
    [6, 8.8, 13.6, 7.7], 
    [7, 7.6, 12.3, 9.6], 
    [8, 12.3, 29.2, 10.6], 
    [9, 16.9, 42.9, 14.8], 
    [10, 12.8, 30.9, 11.6], 
    [11, 5.3, 7.9, 4.7], 
    [12, 6.6, 8.4, 5.2], 
    [13, 4.8, 6.3, 3.6], 
    [14, 4.2, 6.2, 3.4] 
    ]); 

    var options = { 
    chart: { 
     title: 'Box Office Earnings in First Two Weeks of Opening', 
     subtitle: 'in millions of dollars (USD)' 
    }, 
    width: 900, 
    height: 500 
    }; 

    var chart = new google.charts.Line(document.getElementById('linechart_material')); 

    chart.draw(data, google.charts.Line.convertOptions(options)); 
} 

Answer 1

我能夠找出示例的折線圖JSON的正確格式。

{ 
"cols":[ 
    {"label":"Day","type":"number"}, 
    {"label":"Guardians","type":"number"}, 
    {"label":"Avengers","type":"number"}, 
    {"label":"Transformers","type":"number"} 
], 
"rows":[ 
    {"c":[{"v":1},{"v":37.8},{"v":80.8},{"v":41.8}]}, 
    {"c":[{"v":2},{"v":30.9},{"v":69.5},{"v":32.4}]}, 
    {"c":[{"v":3},{"v":25.4},{"v":57.0},{"v":25.7}]}, 
    {"c":[{"v":4},{"v":11.7},{"v":18.8},{"v":10.5}]}, 
    {"c":[{"v":5},{"v":11.9},{"v":17.6},{"v":10.4}]}, 
    {"c":[{"v":6},{"v":8.8},{"v":13.6},{"v":7.7}]}, 
    {"c":[{"v":7},{"v":7.6},{"v":12.3},{"v":9.6}]}, 
    {"c":[{"v":8},{"v":12.3},{"v":29.2},{"v":10.6}]}, 
    {"c":[{"v":9},{"v":16.9},{"v":42.9},{"v":14.8}]}, 
    {"c":[{"v":10},{"v":12.8},{"v":30.9},{"v":11.6}]}, 
    {"c":[{"v":11},{"v":5.3},{"v":7.9},{"v":4.7}]}, 
    {"c":[{"v":12},{"v":6.6},{"v":8.4},{"v":5.2}]}, 
    {"c":[{"v":13},{"v":4.8},{"v":6.3},{"v":3.6}]}, 
    {"c":[{"v":14},{"v":4.2},{"v":6.2},{"v":3.4}]} 
]}