判断arr数组里的元素是否存在{name:'张三'}，

const arr = [
  {name: '李四', name: '王五', name: '张三'},
  {name: '李四', name: '王五', name: '张三'},
];

const hasZhangSan = arr.some(item => item.name === '张三');
console.log(hasZhangSan); // 输出结果：true 或 false