如何从指定JSON数组中提取validade字段值并仅获取其年份部分用于赋值？

Got it, let's sort this out for you! Since your validade field follows a consistent YYYY-MM-DD format, there are a few simple ways to pull just the year part and assign it to digiAno:

Option 1: Split the String (Most Readable for Fixed Format) #

Split the date string by hyphens and grab the first element of the resulting array—this works perfectly because the year is always the first segment:

cartao.validade.split('-')[0]

Option 2: Substring the First 4 Characters #

Directly extract the first 4 characters of the string, which correspond exactly to the year:

cartao.validade.substring(0, 4)

Option 3: Use Date Object (For Flexible Date Handling) #

If you might need to adapt to different date formats later, converting to a Date object and fetching the full year is a robust choice (your ISO format plays nicely with this method):

new Date(cartao.validade).getFullYear()

Updated Code #

Here’s your modified code with the digiAno field using the split method (swap in any of the options above if you prefer):

this.dadosCC.reset({ 
  'parcelas': '1', 
  'digiNumero': ['**** **** ****', cartao.mask], 
  'digiNome': cartao.holder, 
  'digiMes': '', 
  'digiAno': cartao.validade.split('-')[0], // Updated line
  'valor': this.cartS.cart.valorTotal, 
  'cpfInput': this.userS.user.cpf, 
  'cardToken': this.cardToken, 
  'digiCVV':'' 
});

All three methods will correctly pull 2026 from your sample validade value of "2026-06-01".

内容的提问来源于stack exchange，提问作者Leonardo