javascript - 检查嵌套对象是否包含特定键，然后替换父对象的键

Question

我有一个嵌套对象。

现在，我需要检查对象是否始终包含“items”作为键，然后将“type”:“list”替换为父级的“type”:“array”。

它对于第一级效果很好，但是当涉及到再次包含“items”的嵌套对象时，我陷入了困境。

function convertData() {
 const arr = {
  "type": "list",
  "items": [{
   "type": "list",
   "items": [{
    "type": "string",
    "value": 0,
    "unit": "",
    "pattern": "^(auto|0)$|^[+-]?[0-9]+(\\.)?([0-9]+)?(rem|px|em|ex|%|in|cm|mm|pt|pc)$"
   }, {
    "type": "string",
    "value": 0.1875,
    "unit": "rem",
    "pattern": "^(auto|0)$|^[+-]?[0-9]+(\\.)?([0-9]+)?(rem|px|em|ex|%|in|cm|mm|pt|pc)$"
   }, {
    "type": "string",
    "value": 0.75,
    "unit": "rem",
    "pattern": "^(auto|0)$|^[+-]?[0-9]+(\\.)?([0-9]+)?(rem|px|em|ex|%|in|cm|mm|pt|pc)$"
   }, {
    "type": "string",
    "value": 0,
    "unit": "",
    "pattern": "^(auto|0)$|^[+-]?[0-9]+(\\.)?([0-9]+)?(rem|px|em|ex|%|in|cm|mm|pt|pc)$"
   }]
  }, {
   "type": "string",
   "value": {
    "r": 161,
    "g": 161,
    "b": 161,
    "a": 0.75,
    "hex": "#a1a1a1"
   },
   "pattern": "^rgba?\\(((25[0-5]|2[0-4]\\d|1\\d{1,2}|\\d\\d?)\\s*,\\s*?){2}(25[0-5]|2[0-4]\\d|1\\d{1,2}|\\d\\d?)\\s*,?\\s*([01]\\.?\\d*?)?\\)"
  }]
 };
 if (Array.isArray(arr.items)) {
  arr.type = "array";
  console.log(arr);
 }
}

<button onclick="convertData()">Click me!</button>

Answer 1

您可以使用递归来做到这一点。

• 创建一个函数 changeValue，它将对象作为参数。
• 使用 Object.hasOwnProperty() 检查对象是否具有关键items
• 如果它包含，请将type更改为“array”并在其每个项目上递归调用该函数。

function convertData() {
 const arr = { "type": "list", "items": [{ "type": "list", "items": [{ "type": "string", "value": 0, "unit": "", "pattern": "^(auto|0)$|^[+-]?[0-9]+(\\.)?([0-9]+)?(rem|px|em|ex|%|in|cm|mm|pt|pc)$" }, { "type": "string", "value": 0.1875, "unit": "rem", "pattern": "^(auto|0)$|^[+-]?[0-9]+(\\.)?([0-9]+)?(rem|px|em|ex|%|in|cm|mm|pt|pc)$" }, { "type": "string", "value": 0.75, "unit": "rem", "pattern": "^(auto|0)$|^[+-]?[0-9]+(\\.)?([0-9]+)?(rem|px|em|ex|%|in|cm|mm|pt|pc)$" }, { "type": "string", "value": 0, "unit": "", "pattern": "^(auto|0)$|^[+-]?[0-9]+(\\.)?([0-9]+)?(rem|px|em|ex|%|in|cm|mm|pt|pc)$" }] }, { "type": "string", "value": { "r": 161, "g": 161, "b": 161, "a": 0.75, "hex": "#a1a1a1" }, "pattern": "^rgba?\\(((25[0-5]|2[0-4]\\d|1\\d{1,2}|\\d\\d?)\\s*,\\s*?){2}(25[0-5]|2[0-4]\\d|1\\d{1,2}|\\d\\d?)\\s*,?\\s*([01]\\.?\\d*?)?\\)" }] };
 changeValue(arr);
 console.log(arr)
}

function changeValue(obj){
  if(obj.hasOwnProperty('items')){
    obj.type = "array";
    obj.items.forEach(x => changeValue(x))
  }
}

<button onclick="convertData()">Click me!</button>