D3.js sequence.copy()函数

D3.js中的sequential.copy()函数用于构造并返回原始比例的副本。原始比例的任何更改都不会影响复制比例，反之亦然。连续音阶类似于连续音阶。在连续尺度中，映射是在域和范围之间以连续的方式完成的。唯一的区别是这个比例的输出范围是由它的插值器固定的，这个范围不能改变。

句法：

sequential.copy()

参数：此函数不接受任何参数。

返回值：此函数返回原始比例的副本。

下面给出了 D3.js 中的一些 sequence.copy ()示例：

示例 1：

HTML

  

    
    

  

    
        GeeksforGeeks
    
  
     D3.js | sequential.copy() Function 
      
    
        var sequential = d3.scaleSequential();
  
        // Default scale is identity function
        document.write("<h4>From original scale:</h4>")
  
        document.write("<p>sequential(0.2): ", 
                    sequential(0.2) + "</p>");
          
        document.write("<p>sequential(0.5): ", 
                    sequential(0.5) + "</p>");
  
        // Creating copy of the original scale
        var sequentialCopy = sequential.copy();
        document.write("<h4>From copy scale:</h4>")
        document.write("<p>sequentialCopy(0.2): ", 
                    sequentialCopy(0.2) + "</p>");
  
        document.write("<p>sequentialCopy(0.5): ", 
                    sequentialCopy(0.5) + "</p>");
    

  

输出：

示例 2：复制比例的任何更改都不会影响原始比例。

HTML

  

    
    

  

    
        GeeksforGeeks
    
  
     D3.js | sequential.copy() Function 
  
    
        var sequential = d3.scaleSequential();
  
        // Default scale is identity function
        document.write("<h4>From original scale:</h4>");
  
        document.write("<p>sequential(0.4): ", 
                    sequential(0.4) + "</p>");
        document.write("<p>sequential(0.6): ", 
                    sequential(0.6) + "</p>");
  
        // Creating copy of the original scale
        var sequentialCopy = sequential.copy();
        sequentialCopy.domain([1, 2]);
        document.write(
        "<h4>From copy scale after changing domain:</h4>");
  
        document.write("<p>sequentialCopy(0.4): ", 
                    sequentialCopy(0.4) + "</p>");
        document.write("<p>sequentialCopy(0.6): ", 
                    sequentialCopy(0.6) + "</p>");
    

  

输出：