javascript中的JSON数据

Question

我想在chartJS中使用json。在第一个例子中，我使用了

  

[ “0”， “76”， “32”， “88”]

一切看起来都很棒。

当我想将JSON数据用作：

时，问题出现在第二个示例中

  

var json = [{“wartosc”：“0”}，{“wartosc”：“76”}，{“wartosc”：“32”}，{“wartosc”：“88”}];

在变量chartjsData中，我希望数据为[“0”，“76”，“32”，“88”]，但它不起作用。

var json =[{"wartosc":"0"},{"wartosc":"76"},{"wartosc":"32"},{"wartosc":"88"}];
var chartjsData = [];
for (var i = 0; i < json.lenght; i++) {
    chartjsData.push (json[i].wartosc);
}
var areaChartData = {
  labels: ["j","j","j","j"],
  datasets: [
    {
      label: "Electronics",
      fillColor: "rgba(210, 214, 222, 1)",
      strokeColor: "rgba(210, 214, 222, 1)",
      pointColor: "rgba(210, 214, 222, 1)",
      pointStrokeColor: "#c1c7d1",
      pointHighlightFill: "#fff",
      pointHighlightStroke: "rgba(220,220,220,1)",
      data: ["0","76","32","88"]
    },
    {
      label: "Digital Goods",
      fillColor: "rgba(60,141,188,0.9)",
      strokeColor: "rgba(60,141,188,0.8)",
      pointColor: "#3b8bba",
      pointStrokeColor: "rgba(60,141,188,1)",
      pointHighlightFill: "#fff",
      pointHighlightStroke: "rgba(60,141,188,1)",
      data: chartjsData
    }
  ]
};

Answer 1

你拼错了.length

for (var i = 0; i < json.length; i++) {
    chartjsData.push (json[i].wartosc);
}