使用 Javascript 如何访问 json 数组中的元素？ [复制]答案

【问题标题】：using Javascript how can I access elements form a json array? [duplicate]使用 Javascript 如何访问 json 数组中的元素？ [复制]
【发布时间】：2019-03-16 10:04:58
【问题描述】：

使用 nomonics crypto api 和 Javascript 和 googlesheets 电子表格，返回的对象是：

[
  {
    "circulating_supply": "17591362",
    "high": "24436.29525000",
    "high_timestamp": "2018-01-05T00:00:00.000Z",
    "market_cap": "70647474650.63",
    "max_supply": "21000000",
    "price": "4016.03211000",
    "currency": "BTC",
    "1d": {
      "market_cap_change": "2334344443.63",
      "market_cap_change_pct": "0.0342",
      "price_change": "132.26230000",
      "price_change_pct": "0.0341",
      "volume": "531837882.13",
      "volume_change": "34633070.11",
      "volume_change_pct": "0.0697"
    },
    "7d": {
      "market_cap_change": "2087829209.46",
      "market_cap_change_pct": "0.0305",
      "price_change": "115.88873000",
      "price_change_pct": "0.0297",
      "volume": "2984154293.31",
      "volume_change": "-872155432.42",
      "volume_change_pct": "-0.2262"
    },
        "rank": "1"
  }
]

我可以访问价格

resp[0].price

但是当我尝试访问我尝试过的 1d 和 7d 部分时：

resp[0].1d.market_cap_change

和

resp[0]1d.market_cap_change

googlesheets 不允许我保存错误代码：

Missing name after . operator. (line 29, file "Code")

访问 1d 和 7d 块中的元素的正确方法是什么？

谢谢。

【问题讨论】：

尝试响应[0]["1d"]

标签： javascript json google-sheets

【解决方案1】：

您需要使用[] 表示法，因为您的密钥不是valid JS identifier

resp[0]['1d'].market_cap_change

let resp = [{"circulating_supply": "17591362","high": "24436.29525000","high_timestamp": "2018-01-05T00:00:00.000Z","market_cap": "70647474650.63","max_supply": "21000000","price": "4016.03211000","currency": "BTC","1d": {"market_cap_change": "2334344443.63","market_cap_change_pct": "0.0342","price_change":"132.26230000","price_change_pct": "0.0341","volume": "531837882.13","volume_change": "34633070.11","volume_change_pct": "0.0697"},"7d": {"market_cap_change": "2087829209.46","market_cap_change_pct": "0.0305","price_change": "115.88873000","price_change_pct": "0.0297","volume": "2984154293.31","volume_change": "-872155432.42","volume_change_pct": "-0.2262"},"rank": "1"}]

console.log(resp[0]['1d'].market_cap_change)

【讨论】：