📅  最后修改于: 2022-03-11 15:02:19.495000             🧑  作者: Mango
const letters = [{letter: 'a'},{letter: 'b'},{letter: 'c'}]
const index = letters.findIndex((element, index) => {
if (element.letter === 'b') {
return true
}
})
//index is `1`