javascript - 如何通过树确定目标节点或后代节点中是否存在值？

Question

这是输入代码：

  var newTree = {};
  newTree.value = value;
  newTree.children = [] // fix me
  
  Object.assign(newTree, treeMethods)
  
  return newTree;
};

var treeMethods = {};

treeMethods.addChild = function(value) {
    const newNode = Tree(value);
    this.children.push(newNode)
};

treeMethods.contains = function(target) {
    let currentTree = this.children
    while (currentTree != null) {
        if (currentTree.indexOf(target) > -1) return true
        currentTree = this.children[target]
    }
    return false
    
}; 

我试图确定，通过 contains 函数给定目标值，我是否可以在父节点或后代节点中找到调用 contains() 的目标值。

请不要给我完整的答案，但如果你能把我推向正确的方向。