Angular 8“類型錯誤：無法讀取未定義的屬性‘長度’”

Question

當我想在 Angular 中返回數組的長度時遇到問題，控制台中出現消息“TypeError：無法讀取未定義的屬性‘長度’”。

  count: number = this.organismesFinanceurs.length;
  organismesFinanceurs: OrganismeFinanceur[];
  config: any = {
    itemsPerPage: 7,
    currentPage: 1,
    totalItems: this.count,
  };

ngOnInit() {
   this.serviceHttp2.getAllOrganismes().subscribe(resp => (this.organismesFinanceurs = resp));
}

數組 OrganismeFinanceur[] 如下：

[
{
  "code": "ASS. NAT.",
  "libelleCourt": "FSS ASSEMBLEE NATIONALE",
  "libelleLong": "FONDS DE SECURITE SOCIALE DE L ASSEMBLEE NATIONALE ET DU PERSONNEL"
},
{
  "code": "AUTRE REG.",
  "libelleCourt": "AUTRE REGIME SPECIAL",
  "libelleLong": "AUTRE REGIME SPECIAL"
},
{
  "code": "BANQ.DE FR",
  "libelleCourt": "BANQUE DE FRANCE",
  "libelleLong": "BANQUE DE FRANCE"
},]

Answer 1

嘗試使用organismesFinanceurs: OrganismeFinanceur[] = [];