反转单向链表

　　数组生成单向链表

const createLinkList = (arr = [1,2,3,4,5,6]) => {
    const length = arr.length;
    let curNode = {
        value: arr[arr.length - 1],
        next: null
    }
    for(let i = length -2; i > -1; i--){
        curNode = {
            value: arr[i],
            next: curNode
        }
    }
    return curNode
}

　　反转单向链表

const reverseLinkList = (linkList = createLinkList()) => {
    let curNode = {
        value: linkList.value,
        next: null
    }
    while(linkList.next){
        linkList = linkList.next
        curNode = {
            value:linkList.value,
            next:curNode
        }
    }
    return curNode
}