d3.js d3.utcWednesdays()用法及代碼示例

D3.js中的d3.utcWednesdays()函數用於返回協調世界時(UTC)中給定開始日期和結束日期範圍內基於星期三的所有日期。

用法:

d3.utcWednesdays(start, end, step);

參數：該函數接受以下三個參數：

Start:此參數保存給定的開始日期。
end:此參數保存給定的結束日期。
step:這是用於跳過日期的可選值。

返回值：此函數返回基於協調世界時(UTC)的星期三的所有日期。

以下程序說明了D3.js中的d3.utcWednesdays()函數：

範例1：

<!DOCTYPE html> 
<html> 
   <head> 
      <title> 
          D3.js | d3.utcWednesdays() Function 
      </title> 
      <script src = 
          "https://d3js.org/d3.v4.min.js"> 
      </script> 
   </head> 
   
   <body> 
         
      <script> 
         
         // Initialising start and end date 
         var start = new Date(2015, 07, 01); 
         var end = new Date(2015, 07, 30); 
           
         // Calling the utcWednesdays() function 
         // without step value 
         var a = d3.utcWednesdays(start, end); 
           
         // Getting the Wednesday dates 
         console.log(a); 
      </script> 
   </body> 
</html>

輸出：

["2015-08-05T00:00:00.000Z","2015-08-12T00:00:00.000Z",
 "2015-08-19T00:00:00.000Z","2015-08-26T00:00:00.000Z"]

範例2：

<!DOCTYPE html> 
<html> 
   <head> 
      <title> 
          D3.js | d3.utcWednesdays() Function 
      </title> 
      <script src = 
          "https://d3js.org/d3.v4.min.js"> 
      </script> 
   </head> 
   
   <body> 
         
      <script> 
         
         // Initialising start and end date 
         var start = new Date(2015, 07, 01); 
         var end = new Date(2015, 07, 30); 
           
         // Calling the utcWednesdays() function 
         // with step value 
         var a = d3.utcWednesdays(start, end, 2); 
           
         // Getting the Wednesday dates 
         console.log(a); 
      </script> 
   </body> 
</html>

輸出：

["2015-08-05T00:00:00.000Z","2015-08-19T00:00:00.000Z"]

參考： https://devdocs.io/d3~5/d3-time#timeWednesdays

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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 D3.js | d3.utcWednesdays() Function。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。