为什么此功能不可执行

Question

function displayData(stdDetails) {

  for (var t in stdDetails) //printing keys along with values
  {
    console.log("in loop");
    console.log(t, ":", stdDetails[t]);

    if (typeof(stdDetails[t]) == 'object') {
      displayData(stdDetails[t]);
    }
  }

}
displayData();

Answer 1

displayData（）需要stdDetails参数，而您没有提供该参数。