检查字段属性是否存在，如果不将其从对象数组中删除

Question

我在javascript中有数组类型的对象，我想检查字段属性是否存在，如果不从对象数组中将其删除，例如我拥有的数组是

var array = [{ 0:Common_Text_Area__c:"test 1"
  Evaluation__c:"a0W2F000000xB6sUAE"
  Id:"a0u2F000000ocv0QAA"
  Name:"ER-003346"
  Rating_Owner__c:"Employee"
  Review_Question__c:"a0w2F000000OoH5QAK"
1:Evaluation__c:"a0W2F000000xB6sSDE"
  Id:"a0u2F058254ocv0QAA"
  Name:"ER-013346"
  Rating_Owner__c:"Employee"
  Review_Question__c:"a0w2F000000OoH5QAK"}]

我想检查Common_Text_Area__c是否存在，然后将其全部删除，所以我将在数组中以这个结尾

    var arrayTwo = [{ 0:Common_Text_Area__c:"test 1"
     Evaluation__c:"a0W2F000000xB6sUAE"
     Id:"a0u2F000000ocv0QAA"
     Name:"ER-003346"
     Rating_Owner__c:"Employee"
     Review_Question__c:"a0w2F000000OoH5QAK"}]

Answer 1

使用Array.prototype.filter返回仅包含通过测试的元素的数组。 使用in运算符测试对象是否具有属性：

const result = arr.filter( obj => 'Common_Text_Area__c' in obj );

Answer 2

具有功能filter的替代方法， includes 。

 var array = [{ 'Common_Text_Area__c': "test 1", 'Evaluation__c': "a0W2F000000xB6sUAE", Id: "a0u2F000000ocv0QAA", Name: "ER-003346", 'Rating_Owner__c': "Employee", 'Review_Question__c': "a0w2F000000OoH5QAK" }, { 'Evaluation__c': "a0W2F000000xB6sSDE", Id: "a0u2F058254ocv0QAA", Name: "ER-013346", 'Rating_Owner__c': "Employee", 'Review_Question__c': "a0w2F000000OoH5QAK" }]; console.log(array.filter(o => Object.keys(o).includes('Common_Text_Area__c'))); 

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如果Common_Text_Area__c的值不同于undefined ， null ，则可以使用Destructuring分配。

 var array = [{ 'Common_Text_Area__c': "test 1", 'Evaluation__c': "a0W2F000000xB6sUAE", Id: "a0u2F000000ocv0QAA", Name: "ER-003346", 'Rating_Owner__c': "Employee", 'Review_Question__c': "a0w2F000000OoH5QAK" }, { 'Evaluation__c': "a0W2F000000xB6sSDE", Id: "a0u2F058254ocv0QAA", Name: "ER-013346", 'Rating_Owner__c': "Employee", 'Review_Question__c': "a0w2F000000OoH5QAK" }]; console.log(array.filter(({Common_Text_Area__c}) => Common_Text_Area__c)); 

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