向JSON对象数组添加新元素报错：对象不存在push函数

嘿，踩坑了对吧？这个错误其实很好解决，咱们先搞清楚你的JSON结构到底长啥样：

你的原始JSON里，reservationNetworks对应的是一个对象，它的value属性里才包含真正的数组items——而你之前直接在obj['reservationNetworks']上调用push，相当于在对象上用数组方法，肯定会报错呀！

修正后的代码 #

var jsonStr = '{"key": "reservationNetworks", "value": {"type": "multiple", "elementTypeId": "COMPLEX", "items": [{"type": "complex","componentTypeId": "nw.service","componentId": null,"classId": "Reservation.Network","typeFilter": null,"values": {"entries": [{"key": "networkPath","value": {"type": "entityRef","classId": "Network","id": "6afec529-7fbc-45b7-8ac5-6abf944946ce","componentId": null,"label": "Label 1"}},{"key": "networkProfile","value": {"type": "entityRef","classId": "networkProfile","id": "187014d4-62f6-434c-a4da-c3e262d25ed4","componentId": null,"label": "Label 2"}}]}},{"type": "complex","componentTypeId": "nw.service","componentId": null,"classId": "Reservation.Network","typeFilter": null,"values": {"entries": [{"key": "networkPath","value": {"type": "entityRef","classId": "Network","id": "6afec529-7fbc-45b7-8ac5-6abf944946ce","componentId": null,"label": "Label 3"}},{"key": "networkProfile","value": {"type": "entityRef","classId": "networkProfile","id": "187014d4-62f6-434c-a4da-c3e262d25ed4","componentId": null,"label": "Label 4"}}]}}]}}';
var obj = JSON.parse(jsonStr);
// 注意这里要定位到items数组，而不是reservationNetworks对象
obj['reservationNetworks'].value.items.push({
  "type": "complex",
  "componentTypeId": "nw.service",
  "componentId": null,
  "classId": "Reservation.Network",
  "typeFilter": null,
  "values": {
    "entries": [
      {
        "key": "networkPath",
        "value": {
          "type": "entityRef",
          "classId": "Network",
          "id": "6afec529-7fbc-45b7-8ac5-6abf944946ce",
          "componentId": null,
          "label": "Label 5"
        }
      },
      {
        "key": "networkProfile",
        "value": {
          "type": "entityRef",
          "classId": "networkProfile",
          "id": "187014d4-62f6-434c-a4da-c3e262d25ed4",
          "componentId": null,
          "label": "Label 6"
        }
      }
    ]
  }
});
jsonStr = JSON.stringify(obj);

关键修正点 #

• 原来的错误路径：obj['reservationNetworks'].push(...) → 这是对象，没有push方法
• 正确的数组路径：obj['reservationNetworks'].value.items.push(...) → 这才是你要添加元素的数组

这样修改后，就能顺利把包含Label 5和Label 6的新元素添加到数组里啦！

内容的提问来源于stack exchange，提问作者Legioon