我想实现一个bootstrap scrollspy。我认为我已经成功实现了它，但是没有用。我的基于滚动位置的菜单项未显示。活动类未添加到锚点。有人可以告诉我我错了什么以及我的代码有什么变化吗？
## create a zkbd compatible hash;
## to add other keys to this hash,see: man 5 terminfo
typeset -A key
key[Home]=${terminfo[khome]}
key[End]=${terminfo[kend]}
key[Insert]=${terminfo[kich1]}
key[Delete]=${terminfo[kdch1]}
key[Up]=${terminfo[kcuu1]}
key[Down]=${terminfo[kcud1]}
key[Left]=${terminfo[kcub1]}
key[Right]=${terminfo[kcuf1]}
key[PageUp]=${terminfo[kpp]}
key[PageDown]=${terminfo[knp]}
## setup keys accordingly
[[ -n "${key[Home]}" ]] && bindkey "${key[Home]}" beginning-of-line
[[ -n "${key[End]}" ]] && bindkey "${key[End]}" end-of-line
[[ -n "${key[Insert]}" ]] && bindkey "${key[Insert]}" overwrite-mode
[[ -n "${key[Delete]}" ]] && bindkey "${key[Delete]}" delete-char
[[ -n "${key[Up]}" ]] && bindkey "${key[Up]}" up-line-or-history
[[ -n "${key[Down]}" ]] && bindkey "${key[Down]}" down-line-or-history
[[ -n "${key[Left]}" ]] && bindkey "${key[Left]}" backward-char
[[ -n "${key[Right]}" ]] && bindkey "${key[Right]}" forward-char
[[ -n "${key[PageUp]}" ]] && bindkey "${key[PageUp]}" history-beginning-search-backward
[[ -n "${key[PageDown]}" ]] && bindkey "${key[PageDown]}" history-beginning-search-forward
[[ -n "${key[Home]}" ]] && bindkey -M vicmd "${key[Home]}" beginning-of-line
[[ -n "${key[End]}" ]] && bindkey -M vicmd "${key[End]}" end-of-line
[[ -n "${key[Insert]}" ]] && bindkey -M vicmd "${key[Insert]}" overwrite-mode
[[ -n "${key[Delete]}" ]] && bindkey -M vicmd "${key[Delete]}" delete-char
ul {
list-style:none;
padding: 0;
}
.scroll-area {
margin-top: 30px;
height: 250px;
position: relative;
overflow: auto;
}
.scroll-area div {
height: 300px;
color: #fff;
}
.scroll-area div:first-child { background: green; }
.scroll-area div:nth-child(2) {background: purple;}
.scroll-area div:nth-child(3) {background: orange;}
.scroll-area div:nth-child(4) {background: blue;}
.scroll-area div:nth-child(5) {background: black;}
#main-nav li {
display: inline-block;
margin-right: 30px;
}
#main-nav li a {
color: #000;
}
#main-nav li a.active {
color: tomato;
}