D3.js node.descendants()函数

d3.js库中的node.descendants()函数用于生成并返回一个后代节点数组。

句法：

node.descendants();

参数：此函数不接受任何参数。

返回值：此函数返回一个数组。

下面给出了上面给出的函数的几个例子。

示例 1：

HTML

  

    
    
    
    

  

    
        var obj = d3.hierarchy({
            name: "rootNode",
            children: [
                {
                    name: "child1"
                },
                {
                    name: "child2",
                    children: [
                        { name: "grandChild1" },
                    ]
                },
                {
                    name: "child3",
                    children: [
                        { name: "grandChild5" },
                        { name: "grandChild6" },
                        { name: "grandChild7" },
                        { name: "grandChild8" },
                    ]
                }
            ]
        });
        // Descendant of child3
        console.log("Descendant of child3 are: ");
        console.log(obj.children[2]
            .descendants()[0].data.name);
  
        console.log(obj.children[2]
            .descendants()[1].data.name);
  
        console.log(obj.children[2]
            .descendants()[2].data.name);
  
        console.log(obj.children[2]
            .descendants()[3].data.name);
  
        console.log(obj.children[2]
            .descendants()[4].data.name);
    

  

输出：

示例 2：

HTML

  

    
    
    
    

  

    
        var obj = d3.hierarchy({
            name: "rootNode",
            children: [
                {
                    name: "child1"
                },
                {
                    name: "child2",
                    children: [
                        { name: "grandChild1" },
                    ]
                },
                {
                    name: "child3",
                    children: [
                        { name: "grandChild5" },
                        { name: "grandChild6" },
                        { name: "grandChild7" },
                        { name: "grandChild8" },
                    ]
                }
            ]
        });
  
        // Descendant of child3
        console.log("Descendant of child3 are: ");
        console.log(obj.children[2].descendants());
    

  

输出：

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