如何检查 JSON 对象数组是否包含数组中定义的值？答案

【问题标题】：How to check if the JSON Object array contains the value defined in an arrary or not?如何检查 JSON 对象数组是否包含数组中定义的值？
【发布时间】：2018-04-25 02:43:30
【问题描述】：

我有以下 JSON 数据。

categories = [
    {catValue:1, catName: 'Arts, crafts, and collectibles'},
    {catValue:2, catName: 'Baby'},
    {catValue:3, catName: 'Beauty and fragrances'},
    {catValue:4, catName: 'Books and magazines'},
    {catValue:5, catName: 'Business to business'},
    {catValue:6, catName: 'Clothing, accessories, and shoes'},
    {catValue:7, catName: 'Antiques'},
    {catValue:8, catName: 'Art and craft supplies'},
    {catValue:9, catName: 'Art dealers and galleries'},
    {catValue:10, catName: 'Camera and photographic supplies'},
    {catValue:11, catName: 'Digital art'},
    {catValue:12, catName: 'Memorabilia'}
];

var categoriesJson = JSON.stringify(categories);

还有下面的数组。

var mainCat = ['Arts, crafts, and collectibles', 'Baby' , 'Antiques']

在循环 JSON 数据时，我需要检查 Object 值是否列在数组中。如果是，则做其他事情。

例如

$.each(categoriesJson , function (key, value) {
    if(value.catName is in array) {
        //do something here 
    } else {
        //do something here
    }
});

我怎样才能做到这一点？

【问题讨论】：

array.indexOf(value.catName) !== -1 // 在数组中
How to check if a string array contains one string in JavaScript?的可能重复
另见：stackoverflow.com/q/237104/5894241

标签： javascript jquery arrays json

【解决方案1】：

尝试以下方法：

var categories = [
    {catValue:1, catName: 'Arts, crafts, and collectibles'},
    {catValue:2, catName: 'Baby'},
    {catValue:3, catName: 'Beauty and fragrances'},
    {catValue:4, catName: 'Books and magazines'},
    {catValue:5, catName: 'Business to business'},
    {catValue:6, catName: 'Clothing, accessories, and shoes'},
    {catValue:7, catName: 'Antiques'},
    {catValue:8, catName: 'Art and craft supplies'},
    {catValue:9, catName: 'Art dealers and galleries'},
    {catValue:10, catName: 'Camera and photographic supplies'},
    {catValue:11, catName: 'Digital art'},
    {catValue:12, catName: 'Memorabilia'}
];

var categoriesJson = JSON.stringify(categories);
var mainCat = ['Arts, crafts, and collectibles', 'Baby' , 'Antiques']

$.each(JSON.parse(categoriesJson) , function (key, value) {
  if(mainCat.indexOf(value.catName) > -1){
   console.log('Exists: ' +value.catName)
 }
 else{
   console.log('Does not exists: ' +value.catName)
 }
});

&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;

【讨论】：

【解决方案2】：

我会filter初始数据数组得到匹配类别的数组：

var matchedCategories = categories.filter(i => mainCat.indexOf(i.catName) >= 0);

然后你可以通过迭代这个子数组来做你需要的事情。

【讨论】：

【解决方案3】：

我也使用 @dhilt 方法，但包含

例如。如果甚至包含一个（返回布尔值）

  categories.filter(i =>
    mainCat.includes(i.catName)
  ).length > 0
    ? true
    : false;

【讨论】：