SOURCE

const list = [[new Date(),11,2,33,44],[new Date(),11,2,33,44],[new Date(),11,2,33,44],[new Date(),11,2,33,44]]

list.forEach(item=>{
    item.forEach((item2,index2)=>{
        if(!index2){
            console.log('为什么item2里的第0项值改不掉',item2)
            item2 = '000000000000000'
        }
    })
})

console.log('list',list)


list.forEach(item=>{
    item[0] = '000000000000000'
    // item.forEach((item2,index2)=>{
    //     if(!index2){
    //         console.log('为什么item2里的第0项值改不掉',item2)
    //         item2 = '000000000000000'
    //     }
    // })
})

console.log('list',list)