d3.js point.copy()用法及代碼示例

point.copy()函數用於構造並返回當前刻度的副本。對這兩個比例進行的任何更改都是相互獨立的，即，複製比例的更改不會影響原始比例，反之亦然。

用法:

point.copy();

參數：此函數不接受任何參數。

返回值：此函數返回當前刻度的副本。返回類型是一個函數。

下麵給出的是上麵給出的函數的一些例子。

範例1：

<!DOCTYPE html>  
<html lang = "en">  
<head>  
    <meta charset = "UTF-8" />  
    <meta name = "viewport"
        path1tent = "width=device-width,  
        initial-scale = 1.0"/>  
    <title>GeekforGeeks</title>  
    <script src = 
    "https://d3js.org/d3.v4.min.js"> 
    </script> 
      
</head>  
<body>  
    <script>  
// Creating the point scale with specified domain and range. 
        var point = d3.scalePoint() 
                    .domain([1, 2, 3, 4]) 
                    .range([1, 5]); 
        var copyScale = point.copy(); 
        console.log("From original scale:"); 
        console.log("point(1):", point(1)); 
        console.log("point(2):", point(2)); 
        console.log("From copy scale:"); 
        console.log("copyScale(1):", copyScale(1)); 
        console.log("copyScale(2):", copyScale(2)); 
          
    </script>  
</body>  
</html>

輸出：

範例2：

<!DOCTYPE html>  
<html lang = "en">  
<head>  
    <meta charset = "UTF-8" />  
    <meta name = "viewport"
        path1tent = "width=device-width,  
        initial-scale = 1.0"/>  
    <title>GeekforGeeks</title>  
    <script src = 
    "https://d3js.org/d3.v4.min.js"> 
    </script> 
      
</head>  
<body>  
    <script>  
// Creating the point scale with specified domain and range. 
        var point = d3.scalePoint() 
                    .domain([1, 2, 3, 4]) 
                    .range([1, 5]); 
  
        console.log("From original scale befire making changes:"); 
        console.log("point(1):", point(1)); 
        console.log("point(2):", point(2)); 
        // Making copy of the original scale 
        var copyScale = point.copy(); 
        point.round([1, 5]); 
        console.log("From original scale after making changes:"); 
        console.log("point(1):", point(1)); 
        console.log("point(2):", point(2)); 
  
        console.log("From copy scale:"); 
        // Changes in original scale does not 
        // Affect copy scale 
        console.log("copyScale(1):", copyScale(1)); 
        console.log("copyScale(2):", copyScale(2)); 
          
    </script>  
</body>  
</html>

輸出：

相關用法

注：本文由純淨天空篩選整理自tarun007大神的英文原創作品 D3.js point.copy() 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。