JavaScript Class 和构造函数（非 Dojo

Question

var TreeNode = function() {

  this.x    =       null;       
  this.y    =       null;
  this.data =       [];

  TreeNode = function(x1,y1,object) {
    this.x = x1;
    this.y = y1;
    this.data.push(object);
  };

};

我的问题是，如果我创建新的 TreeNode(90,80,"Hallo World");，它会告诉我 this.data 未定义。谁能帮帮我？

问候

Answer 1

推送前需要创建数据:

TreeNode = function(x1,y1,object) {
    this.data = [];
    this.x = x1;
    this.y = y1;
    this.data.push(object);
};

Answer 2

使用这个

var TreeNode  = function(x1,y1,object)
    {
        this.data = [];
        this.x = x1;
        this.y = y1;
        this.data.push(object);
    };

var treeNode = new TreeNode(1,2, 'node data');

Answer 3

不清楚你想从你的问题中得到什么，但以下内容确实有效：

function TreeNode (x ,y, obj) {    
    this.x = x;
    this.y = y;
    this.data = [obj];
}

var aTreeNode = new TreeNode(1, 2, 'hello world');
console.log(aTreeNode.data);  //['hello world']

从上面的代码看来，您正在创建 2 个 TreeNode 构造函数 - 一个在另一个内部。这是故意的吗？

JavaScript Class 和构造函数（非 Dojo

JavaScript Class and Constructor (non-Dojo

javascript

class