我在Javascript.How中有一个对象数组来遍历它，以查找'fname‘键出现的次数

var objArray = [
  { fname: 'John', lname: 'Doe' },
  { fname: 'Jane', lname: 'Smith' },
  { fname: 'John', lname: 'Smith' },
  { fname: 'Alice', lname: 'Johnson' },
  { fname: 'John', lname: 'Doe' }
];

var count = 0;
for (var i = 0; i < objArray.length; i++) {
  if (objArray[i].fname === 'John') {
    count++;
  }
}

console.log("The 'fname' key appears " + count + " times.");