js for time size comparison

This time I will bring you js for time size comparison. What are the precautions for time size comparison with js? The following is a practical case, let’s take a look.

The examples are as follows:

<script> 
 ///比较函数 
 function compareTime(date1, date2) { 
  var d1_year, d1_month, d1_day, d1, time_span1, 
    d2_year, d2_month, d2_day, d2, time_span2; 
  d1_year = date1.getFullYear(); 
  d1_month = date1.getMonth() + 1; 
  d1_day = date1.getDate(); 
  d1 = new Date(d1_year, d1_month - 1, d1_day, 0, 0, 0); 
  time_span1 = date1.getTime() - d1.getTime(); 
  d2_year = date2.getFullYear(); 
  d2_month = date2.getMonth() + 1; 
  d2_day = date2.getDate(); 
  d2 = new Date(d2_year, d2_month - 1, d2_day, 0, 0, 0); 
  time_span2 = date2.getTime() - d2.getTime(); 
  return time_span1 - time_span2; 
 } 
 //测试 
 <SPAN style="COLOR: #99cc00"> var date1 = new Date(2017, 10, 21, 20, 20, 21); 
 var date2 = new Date(2016, 5, 2, 20, 20, 30); 
 alert(compareTime(date1, date2));</SPAN> 
</script>

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