ContentEditable 요소의 끝으로 커서를 이동하는 방법은 무엇입니까?

function setEndOfContenteditable(contentEditableElement) {
  var range, selection;
  if (document.createRange) {
    // Modern browsers
    range = document.createRange();
    range.selectNodeContents(contentEditableElement);
    range.collapse(false);
    selection = window.getSelection();
    selection.removeAllRanges();
    selection.addRange(range);
  } else if (document.selection) {
    // IE 8 and below
    range = document.body.createTextRange();
    range.moveToElementText(contentEditableElement);
    range.collapse(false);
    range.select();
  }
}

var elem = document.getElementById("txt1");
setEndOfContenteditable(elem);