谷歌折线图

Question

美好的一天，我在制作谷歌折线图时遇到了麻烦。 我的目标图是这样的:(见图）

但我所做的是:(见图）

这是我的javascript代码：

     google.charts.load('current', {'packages': ['line', 'corechart', 'bar','controls', 'table']});
 google.charts.setOnLoadCallback(drawChartMonthly);

 function drawChartMonthly() {
var jsonData = $.ajax({
     url: "analytics/platform-sales.php",
     dataType: "json",
     async: false
   }).responseText;

   var data = new google.visualization.DataTable(jsonData);

       var options = {
         title: 'Music Services sales',
         pointSize: 5
       };

       var chart = new google.charts.Line(document.getElementById('chart_div_platform'));
       chart.draw(data, options);

   }

这是我的HTML：

    <div class="row">
    <div class="col-md-4 col-sm-12">
        <div id="chart_div_platform" style='width: 1200px; height: 600px;'></div>
    </div>
</div>

这是我的样本json数据：

    {"cols":[{"label":"Month","type":"date"},{"label":"Platform","type":"string"},{"label":"Amount","type":"number"}],
"rows":[{"c":[{"v":"Date(2013,3,1)"},{"v":"Tunecore"},{"v":19932}]},
{"c":[{"v":"Date(2013,4,1)"},{"v":"Platform1"},{"v":17930}]},
{"c":[{"v":"Date(2013,4,1)"},{"v":"Platform2"},{"v":16930}]},
{"c":[{"v":"Date(2013,4,1)"},{"v":"Platform3"},{"v":15930}]},
{"c":[{"v":"Date(2013,4,1)"},{"v":"Platform4"},{"v":14930}]},

{"c":[{"v":"Date(2013,5,1)"},{"v":"Platform1"},{"v":17930}]},
{"c":[{"v":"Date(2013,5,1)"},{"v":"Platform2"},{"v":16930}]},
{"c":[{"v":"Date(2013,5,1)"},{"v":"Platform3"},{"v":15930}]},
{"c":[{"v":"Date(2013,5,1)"},{"v":"Platform4"},{"v":14930}]},

{"c":[{"v":"Date(2013,6,1)"},{"v":"Platform1"},{"v":17930}]},
{"c":[{"v":"Date(2013,6,1)"},{"v":"Platform2"},{"v":16930}]},
{"c":[{"v":"Date(2013,6,1)"},{"v":"Platform3"},{"v":15930}]},
{"c":[{"v":"Date(2013,6,1)"},{"v":"Platform4"},{"v":14930}]},

{"c":[{"v":"Date(2013,7,1)"},{"v":"Platform1"},{"v":17930}]},
{"c":[{"v":"Date(2013,7,1)"},{"v":"Platform2"},{"v":16930}]},
{"c":[{"v":"Date(2013,7,1)"},{"v":"Platform3"},{"v":15930}]},
{"c":[{"v":"Date(2013,7,1)"},{"v":"Platform4"},{"v":14930}]}]}

你们能举个例子吗？请。谢谢。