javascript中json的循环问题

var json = { "name": "John", "age": 30, "city": "New York" };

for (var key in json) {
  if (json.hasOwnProperty(key)) {
    console.log(key + ": " + json[key]);
  }
}

name: John
age: 30
city: New York

var jsonArray = [
  { "name": "John", "age": 30, "city": "New York" },
  { "name": "Jane", "age": 25, "city": "London" },
  { "name": "Bob", "age": 35, "city": "Paris" }
];

jsonArray.forEach(function(item) {
  console.log(item.name + ", " + item.age + ", " + item.city);
});

John, 30, New York
Jane, 25, London
Bob, 35, Paris