JavaScript 显示日期

Question

我想显示昨天的日期和日期。

今天日期的脚本:

<script type="text/javascript">
<!--
  // Array of day names
  var dayNames = new Array("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday");
  // Array of month Names
  var monthNames = new Array("January","February","March","April","May","June","July","August","September","October","November","December");
  var now = new Date();
  document.write(dayNames[now.getDay()] + ", " + 
  monthNames[now.getMonth()] + " " + 
  now.getDate() + ", " + now.getFullYear());
// -->
</script>

我知道添加 -1 会更改日期/年份，但它不会成功更改星期/月份的日期，因为我们已在数组中列出了日期/月份，因此星期日和之前没有任何内容一月之前没有任何事情。

如何显示昨天/几天前的日期，确保日期和月份会发生变化？

Answer 1

你可以尝试这个:参见 DEMO

dayNames[now.getDay()==0?6:now.getDay()-1]

编辑:

将 setDate 设置为昨天: Demo

now.setDate(now.getDate()-1); // set yesterday for now