如何遍历对象数组并从特定对象获取值？

var arr = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 3, name: 'Charlie' }
];

var targetId = 2;
var targetName;

for (var i = 0; i < arr.length; i++) {
  if (arr[i].id === targetId) {
    targetName = arr[i].name;
    break;
  }
}

console.log(targetName); // 输出: Bob

var arr = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 3, name: 'Charlie' }
];

var targetId = 2;
var targetObj = arr.find(function(obj) {
  return obj.id === targetId;
});

var targetName = targetObj ? targetObj.name : undefined;

console.log(targetName); // 输出: Bob

var arr = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 3, name: 'Charlie' }
];

var targetId = 2;
var targetObj = arr.filter(function(obj) {
  return obj.id === targetId;
})[0];

var targetName = targetObj ? targetObj.name : undefined;

console.log(targetName); // 输出: Bob