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JavaScript Date setHours()用法及代碼示例


下麵是Date setHours()方法的示例。

  • 例:
    <script> 
       // Here a date has been assigned 
       // while creating Date object 
       var dateobj =  
       new Date('October 13, 1996 05:35:32'); 
      
       // New hour 11 is being set in above Date 
       // Object with the help of setHours() method 
       dateobj.setHours(11); 
      
       // New hour from above Date Object is 
       // being extracted using getHours() 
       var B = dateobj.getHours(); 
      
       // Printing new hour 
       document.write(B); 
    </script>
  • 輸出:
    11

date.setHours()方法用於將小時設置為使用Date()構造函數創建的日期對象。

用法:

DateObj.setHours(hours_Value)

參數:該方法接受上述和以下描述的單個參數:

  • hours_Value:此參數保存用於在Date()構造函數中設置的小時值。

返回值:它返回由setHours()方法設置的具有更新小時數的新日期。



注意:DateObj是使用Date()構造函數創建的有效Date對象,我們要在其中構造小時數。

上述方法的更多代碼如下:

程序1:如果在Date()構造函數中我們在創建Date對象時沒有給出小時,則setHours()方法仍將設置作為其參數給出的新小時。

<script> 
   // Here hour has not been assigned 
   // while creating Date object 
   var dateobj = new Date('October 13, 1996'); 
  
   // New hour 11 is being set in above Date 
   // Object with the help of setHours() method 
   dateobj.setHours(11); 
  
   // New hour from above Date Object is 
   // being extracted using getHours() 
   var B = dateobj.getHours(); 
  
   // Printing new hour 
   document.write(B); 
</script>

輸出:

11

範例2:如果Date()構造函數中未提供任何參數,則setHours()方法仍設置小時,但月份,年份和日期將是當前月份,年份和日期。這裏11是新小時,2是當前月,即3月,30是當前日期,2018是當前年。

<script> 
   // Here nothing has been assigned 
   // while creating Date object 
   var dateobj = new Date(); 
  
   // new hour 11 is being set in above Date 
   // Object with the help of setHours() method 
   dateobj.setHours(11); 
  
   // Hour from above Date Object is 
   // being extracted using getHours() 
   var B = dateobj.getHours(); 
  
   // Month from above Date Object is 
   // being extracted using getMonth() 
   var C = dateobj.getMonth(); 
  
   // Date from above Date Object is 
   // being extracted using getDate() 
   var D = dateobj.getDate(); 
  
   // Year from above Date Object is 
   // being extracted using getFullYear() 
   var E = dateobj.getFullYear(); 
  
   // Printing new Hour 
   document.write(B + "<br />"); 
  
   // Printing current month 
   document.write(C + "<br />"); 
  
   // Printing current date 
   document.write(D + "<br />"); 
  
   // Printing current year 
   document.write(E); 
</script>

輸出:

11
2
30
2018

範例3:如果在setHours()方法的參數中將小時值設置為26,則將小時設置為2,因為小時範圍是從0到23,並且26%24=2

這裏2是新小時,9是月,即10月,14是日期,年份是1996。在這裏,我們看到13是原始日期,但輸出變為14,因為給定方法的參數將26小時轉換為2第二天的小時數,這就是為什麽日期增加1,即從13到14。

<script> 
   // Here nothing has been assigned 
   // while creating Date object 
   var dateobj =  
   new Date('October 13, 1996 05:35:32'); 
  
   // New hour 26 is being set in above Date 
   // Object with the help of setHours() method 
   dateobj.setHours(26); 
  
   // Hour from above Date Object is 
   // being extracted using getHours() 
   var B = dateobj.getHours(); 
  
   // Month from above Date Object is 
   // being extracted using getMonth() 
   var C = dateobj.getMonth(); 
  
   // Date from above Date Object is 
   // being extracted using getDate() 
   var D = dateobj.getDate(); 
  
   // Year from above Date Object is 
   // being extracted using getFullYear() 
   var E = dateobj.getFullYear(); 
  
   // Printing new Hour 
   document.write(B + "<br />"); 
  
   // Printing month 
   document.write(C + "<br />"); 
  
   // Printing date 
   document.write(D + "<br />"); 
  
   // Printing year 
   document.write(E); 
</script>

輸出:

2
9
14
1996

支持的瀏覽器:下麵列出了JavaScript Date setHours()方法支持的瀏覽器:

  • 穀歌瀏覽器
  • IE瀏覽器
  • 火狐瀏覽器
  • Opera
  • Safari




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注:本文由純淨天空篩選整理自Kanchan_Ray大神的英文原創作品 JavaScript Date setHours() Method。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。