<script> layui.use('util', function(){ var util = layui.util; Var endTime = new Date(2020,1,1).gettime () serverTime = new Date().gettime (); util.countdown(endTime, serverTime, Function (date,serverTime,timer){var STR = date[0] + date[1] + date[2] + date[3]+ date[3]+ date $('#test').html(' until 1 January 2020: '+ STR); Here we can write some operations}); </script>Copy the code