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<!DOCTYPE html>
<html>
<body>
Year and Week: <input type="week" id="myWeek" name="year_week">
<p>Click the buttons to display and/or change the value of the name attribute of the week field.</p>
<button onclick="display()">Display name</button>
<button onclick="change()">Change name</button>
<script>
function display() {
  var x = document.getElementById("myWeek").name;
  alert("The name of the week field is: " + x);
}
function change() {
  var x = document.getElementById("myWeek").name = "newWeekName";
  alert ("The name was changed to: " + x);
}
</script>
</body>
</html>