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JS对象:迭代到第n级

javascript

Sooraj · 技术社区 · 7 年前

我有以下示例对象:

{
   "sampleA":{
      "sampleB1":{
         "sampleC1":{
            "sample1":"sample",
            "sample2":"sample",
            "sample3":"sample",
            "sample4":"sample",
            "sample5":"sample"
         },
         "sampleB2":{
            "sample1":"sample",
            "sample2":"sample sample",
            "sample3":"sample",
            "sample4":"sample sample",
            "sample5":"sample sample",
            "sample6":"sample"
         },
         "sampleB3":{
            "sample1":"sample",
            "sample2":"sample sample",
            "sample3":"sample sample",
            "sample4":"sample sample",
            "sample5":{
               "sample6":"sample",
               "sample7":"sample sample",
               "sample8":"sample sample",
               "sample9":"sample sample",
               "sample10":"sample",
               "sample11":"sample"
            },
            "sample100":"sample"
         }
      }
   }
}

它是一个JS对象,可以嵌套到任何级别。我正在尝试遍历对象并执行一些操作:

以下是我的代码:

function isLeafNode(node) {
  if (typeof node == typeof "string") {
    return true;
  } else {
    return false;
  }
}

iterateObject(jsonData);

function iterateObject(obj) {
  for (var key in jsonData) {
    if (jsonData.hasOwnProperty(key)) {
      if(!isLeafNode(jsonData[key])){
        iterateObject(jsonData[key])
      }else{
        console.log("leaf node")
        //do something
      }
    }
  }
}

但是上面的代码会导致无限循环。我做错了什么?

2 回复 | 直到 7 年前

Nina Scholz 7 年前

您需要引用本地 obj 的内部 iterateObject 而不是全球 jsonData 。

function iterateObject(obj) {
    for (var key in obj) {
        if (obj.hasOwnProperty(key)) {
            if (!isLeafNode(obj[key])) {
                iterateObject(obj[key]);
            } else {
                console.log(key, "leaf node");
            }
        }
    }
}

function isLeafNode(node) {
    return typeof node === "string";
}

var data = { sampleA: { sampleB1: { sampleC1: { sample1: "sample", sample2:"sample", sample3:"sample", sample4:"sample", sample5:"sample" },sampleB2: { sample1: "sample", sample2:"sample sample", sample3:"sample", sample4:"sample sample", sample5:"sample sample", sample6:"sample" },sampleB3: { sample1: "sample", sample2:"sample sample", sample3:"sample sample", sample4:"sample sample", sample5:{ sample6: "sample", sample7:"sample sample", sample8:"sample sample", sample9:"sample sample", sample10:"sample", sample11:"sample" },sample100: "sample" } } } };

iterateObject(data);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Alpesh Jikadra 7 年前

以下函数中存在问题

function iterateObject(obj) {
  for (var key in jsonData) {
    if (jsonData.hasOwnProperty(key)) {
      if(!isLeafNode(jsonData[key])){
        iterateObject(jsonData[key])
      }else{
        console.log("leaf node")
        //do something
      }
    }
  }
}

应该如下所示

function iterateObject(obj) {
  for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
      if(!isLeafNode(obj[key])){
        iterateObject(obj[key])
      }else{
        console.log("leaf node")
        //do something
      }
    }
  }
}

您正在使用 jsonData公司 在循环中而不是传递的参数 obj