SOURCE

const objs = {
    leftBarList: [
        { title: '秒懂1', name: '测试1' },
        { title: '秒懂2', name: '测试2' },
        { title: '秒懂3', name: '测试3' },
        { title: '秒懂4', name: '测试4' },
    ]
}
let title = '秒懂2';
let listIndex = objs.leftBarList.findIndex(item => {
    return item.title == title;
})
// 如果有 秒懂2 则在 秒懂2 的后一个位置插入自定义的元素
objs.leftBarList.splice(listIndex + 1, 0, { title: '秒懂2.1', name: '测试2.1' })
console.log(objs)