JS判断数组中某个对象中的某个值是否存在

可以使用数组的find方法或者some方法结合箭头函数来实现:

let arr = [{name: 'Tom', age: 18}, {name: 'Jack', age: 20}, {name: 'Lucy', age: 22}]
let result = arr.find(item => item.name === 'Jack')
if (result) {
  console.log('存在')
} else {
  console.log('不存在')
}

或者使用some方法:

let arr = [{name: 'Tom', age: 18}, {name: 'Jack', age: 20}, {name: 'Lucy', age: 22}]
let isExist = arr.some(item => item.name === 'Jack')
if (isExist) {
  console.log('存在')
} else {
  console.log('不存在')
}