How to do date masking using javascript (without JQuery)?

Answer 1

This works quite well (tried it in console on the jquery mask page)

 if (locale !=='' && locale==='zh_CN') {
          $('#text12').mask('9999年99月99日');
          }
          else {
          $('#text12').mask('99/99/9999');
          }

but if you want the mask format to show up in the input field you need to pass it as placeholder attribute

$('#text12').attr('placeholder', '9999年99月99日')

hope this helps