檢查數組中是否存在項目

Question

我需要檢查主數組中是否存在特定值。

Example:

var hideFilters = function() { 
    var listCategoryId = ['1000014', '1000015', '1000016', '1000017', '1000018', '1000019', '1000021', '1000086']; 

    var actualCategoryId = '1000018'; 

    if (actualCategoryId === listCategoryId) { 
     console.log('is equal'); 
    } else { 
     console.log('fuen... fuen...'); 
    } 
}; 

hideFilters(); 

Answer 1

if(listCategoryId.indexOf(actualCategoryId) != -1) { 
    console.log('exists') 
} 

Answer 2

如果Array.prototype.indexOf()返回一個指數大於或等於0時，所述陣列包含指定的元素。否則，將返回-1：

var hideFilters = function() { 
 
    var listCategoryId = ['1000014', '1000015', '1000016', '1000017', '1000018', '1000019', '1000021', '1000086']; 
 

 
    var actualCategoryId = '1000018'; 
 

 
    if (listCategoryId.indexOf(actualCategoryId) > -1) { 
 
    console.log('is equal'); 
 
    } else { 
 
    console.log('fuen... fuen...'); 
 
    } 
 
}; 
 

 
hideFilters();

Answer 3

您可以使用$.inArray

var listCategoryId = ['1000014', '1000015', '1000016', '1000017', '1000018', '1000019', '1000021', '1000086']; 
 

 
var actualCategoryId = '1000018'; 
 

 
if ($.inArray(actualCategoryId, listCategoryId) != -1) { 
 
    console.log('exists'); 
 
}

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