在javascript中重命名来自json数组的未知密钥

var jsonStr = '[{"oldKey": "value1"}, {"oldKey": "value2"}]';
var jsonArray = JSON.parse(jsonStr);

jsonArray.forEach(function(obj) {
  var keys = Object.keys(obj);
  // keys数组中只有一个元素，即原始密钥
  var oldKey = keys[0];
});

var newKey = "newKey";
var newObj = Object.assign({}, obj, { [newKey]: obj[oldKey] });

delete newObj[oldKey];
var newArray = [];
newArray.push(newObj);

var jsonStr = '[{"oldKey": "value1"}, {"oldKey": "value2"}]';
var jsonArray = JSON.parse(jsonStr);

jsonArray.forEach(function(obj) {
  var keys = Object.keys(obj);
  var oldKey = keys[0];

  var newKey = "newKey";
  var newObj = Object.assign({}, obj, { [newKey]: obj[oldKey] });

  delete newObj[oldKey];
  var newArray = [];
  newArray.push(newObj);

  console.log(newArray);
});