时间戳

首页 > 解决方案 > IndexOf 不起作用，并且无法解析 JSON

javascript - IndexOf 不起作用，并且无法解析 JSON

问题描述

我正在尝试从 json 文件中找到数组的位置。但是当我用 indexOf 尝试它时，我不断得到 -1

我也尝试解析它但没有成功。

console.log(data.prices.market_hash_name.indexOf("AK-47 | Aquamarine Revenge (Factory New)"))

也无法正常工作“未捕获的类型错误：无法读取未定义的属性 'indexOf'”

这是代码：

$.ajax({
    url: 'prices.json',
    dataType: 'json',
    type: 'get',
    contentType: "text/html; charset=UTF-8",
    cache: false,
    success: function(data){
       $(data.prices)  

console.log(data.prices.indexOf("AK-47 | Aquamarine Revenge (Factory New)"))

        
    }
});

这是json文件：

{
  "status": "success",
  "prices": [
    {
      "app_id": "730",
      "context_id": "2",
      "market_hash_name": "'Blueberries' Buckshot | NSWC SEAL",
      "price": "1.44",
      "pricing_mode": "market",
      "skewness": "-0.01",
      "created_at": 1609156019,
      "icon_url": null,
      "name_color": null,
      "quality_color": null,
      "rarity_color": null,
      "instant_sale_price": null
    },
    {
      "app_id": "730",
      "context_id": "2",
      "market_hash_name": "AK-47 | Aquamarine Revenge (Factory New)",
      "price": "58.16",
      "pricing_mode": "market",
      "skewness": "0.09",
      "created_at": 1609152514,
      "icon_url": null,
      "name_color": "D2D2D2",
      "quality_color": "EB4B4B",
      "rarity_color": null,
      "instant_sale_price": "23.26"
    },
    {
      "app_id": "730",
      "context_id": "2",
      "market_hash_name": "'Two Times' McCoy | TACP Cavalry",
      "price": "0.86",
      "pricing_mode": "market",
      "skewness": "0.11",
      "created_at": 1609166685,
      "icon_url": null,
      "name_color": null,
      "quality_color": null,
      "rarity_color": null,
      "instant_sale_price": null
    },
 ]
}

标签： javascriptjson

解决方案

价格是一个对象数组；您的 indexOf 调用正在搜索特定的属性值，因此如果没有其他帮助，它将无法找到它。有很多方法可以做到这一点，但这里有一个。

您可以使用过滤器在对象数组中搜索匹配项，如果找到则返回第一个匹配项的索引，如果没有找到则返回 -1。

objIndexOf我在这里编写的函数接受要搜索的数组、要测试的对象属性以及您要搜索的值。

var json = {
  "status": "success",
  "prices": [
    {
      "app_id": "730",
      "context_id": "2",
      "market_hash_name": "'Blueberries' Buckshot | NSWC SEAL",
      "price": "1.44",
      "pricing_mode": "market",
      "skewness": "-0.01",
      "created_at": 1609156019,
      "icon_url": null,
      "name_color": null,
      "quality_color": null,
      "rarity_color": null,
      "instant_sale_price": null
    },
    {
      "app_id": "730",
      "context_id": "2",
      "market_hash_name": "AK-47 | Aquamarine Revenge (Factory New)",
      "price": "58.16",
      "pricing_mode": "market",
      "skewness": "0.09",
      "created_at": 1609152514,
      "icon_url": null,
      "name_color": "D2D2D2",
      "quality_color": "EB4B4B",
      "rarity_color": null,
      "instant_sale_price": "23.26"
    },
    {
      "app_id": "730",
      "context_id": "2",
      "market_hash_name": "'Two Times' McCoy | TACP Cavalry",
      "price": "0.86",
      "pricing_mode": "market",
      "skewness": "0.11",
      "created_at": 1609166685,
      "icon_url": null,
      "name_color": null,
      "quality_color": null,
      "rarity_color": null,
      "instant_sale_price": null
    },
 ]
};

function objIndexOf(arr, key, value)
{
  var matches = arr.filter(x => x[key] == value);
  if(matches.length <= 0) return -1;
  return arr.indexOf(matches[0]);
}

console.log(objIndexOf(json.prices, "market_hash_name", "AK-47 | Aquamarine Revenge (Factory New)"));
console.log(objIndexOf(json.prices, "market_hash_name", "blah"));

推荐阅读