// findIndex(callbackFn) const stus = [ { name: '张三', score: 59 }, { name: '老钟', score: 95 }, { name: 'SB', score: 80 } ]; // 返回第1个满足 score >= 60 条件的索引 const rst = stus.findIndex(item => { return item.score >= 60 }) console.log(rst) /* # node findIndex.js 1 */