Javascript/Vòng lặp/Vòng lặp For .. in

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Cú pháp[edit]

for (var in  Đối tượng) {
 Dòng lệnh

Thí dụ[edit]

<!DOCTYPE html>

<p>Click the button to loop through the properties of an object.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

function myFunction() {
  var person = {fname:"John", lname:"Doe", age:25}; 
  var text = "";
  var x;
  for (x in person) {
    text += person[x] + " ";
  document.getElementById("demo").innerHTML = text;