如何检查对象javascript数组中键值对

var arr = [
  { key1: value1, key2: value2 },
  { key1: value3, key2: value4 },
  // ...
];

for (var i = 0; i < arr.length; i++) {
  if (arr[i].hasOwnProperty('key1')) {
    // 键存在
    console.log('键存在');
  } else {
    // 键不存在
    console.log('键不存在');
  }
}

var arr = [
  { key1: value1, key2: value2 },
  { key1: value3, key2: value4 },
  // ...
];

var hasKey = arr.some(function(obj) {
  return obj.hasOwnProperty('key1');
});

if (hasKey) {
  console.log('键存在');
} else {
  console.log('键不存在');
}