最简单的JS实现json转csv的方法

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>JSON to CSV</title>
  
  <script type="text/javascript">
  var json3 = { "d": "[{\"Id\":1,\"UserName\":\"Sam Smith\"},{\"Id\":2,\"UserName\":\"Fred Frankly\"},{\"Id\":1,\"UserName\":\"Zachary Zupers\"}]" }

  //var winners = '{}';
  var winnerObject = JSON.parse(json3);
  
  downloadJSON2CSV(winnerObject);

  function downloadJSON2CSV(objArray)
  {
    var array = typeof objArray != 'object' ? JSON.parse(objArray) : objArray;

    var str = '';

    for (var i = 0; i < array.length; i++) {
      var line = '';

      for (var index in array[i]) {
        line += array[i][index] + ',';
      }

      // 添加双引号
      // for (var index in array[i]) {
      //  line += '"' + array[i][index] + '",';
      // }

      line.slice(0,line.Length-1); 

      str += line + '\r';
    }
    window.open( "data:text/csv;charset=utf-8," + str)
  }

  </script>

</head>
<body>
  <h1>This page onvert json to csv...</h1>
</body>
</html>