javascript - How to access JS object inside an array?

Question

How am I going to access the firstnames or the lastnames?

[
  {name:"Name",value:{firstName:"John",lastName:"Doe"},
  {name:"Name",value:{firstName:"Juan",lastName:"delaCruz"}
]

Answer 1

您的代码中有错字（右大括号）。

z = [
  {name:"Name",value:{firstName:"John",lastName:"Doe"}},
  {name:"Name",value:{firstName:"Juan",lastName:"delaCruz"}}
];

firstPersonsName = z[0].value.firstName

allFirstnames = z.map(function(n) { console.log(n.value.firstName); });
allLastnames = z.map(function(n) { console.log(n.value.lastName); });

Answer 2

假设您的数组是 named arr，您可以访问 first names witharr[i].value.firstName和 last names with arr[i].value.lastNamewherei是您要访问的项目的数组索引。