function tree(list) {
const result = []
for (let value of list) {
// 排除空字符串的情况
if (!value) {
continue
}
const values = value.split('/')
// 查找树结构的当前级别是否已经存在，不存在则创建对象，并添加入列表。
let current = result.find(item =>item.name === values[0])
if (current === void 0) {
current = {}
result.push(current)
}
for (let i = 0, length = values.lengthi <lengthi++) {
current.name = values[i]
if (i <length - 1) {
// 如果还有下一级内容，判断当前是否有 children，没有则构建.
if (current.children === void 0) {
current.children = []
}
// 查找下一级对象，为下一遍遍历构建对象
let nextCurrent = current.children.find(item =>item.name === values[i + 1])
if (nextCurrent === void 0) {
nextCurrent = {}
current.children.push(nextCurrent)
}
current = nextCurrent
}
}
}
return result
}
============ 假装分割线 ===========
以上代码是生成树的函数，调用 tree 函数并传入你的 input 数据，返回值就是生成的树。百科没找到传代码的地方了。
我之前写过一个，很简单，也就下面几个函数：function topOfList()
{
var btn = document.getElementById('topOfListBtn')
if(btn.state == 'spaned')
{
var forms = document.getElementsByTagName('form')
var timeSpan = 50
for(var i = 0i<forms.lengthi++)
{
var form = forms[i]
if(form.id.indexOf('Top') >-1)
{
ShinkSlowly(form,timeSpan)
timeSpan += 50
}
}
btn.state = 'unspaned'
changeBtnImg('topOfListImg','img/unspaned.jpg')
tellConsoleSpanSate()
}
else
{
var forms = document.getElementsByTagName('form')
var timeSpan = 50
for(var i = 0i<forms.lengthi++)
{
var form = forms[i]
if(form.id.indexOf('Top') >-1)
{
SpanSlowly(form,timeSpan)
timeSpan += 50
}
}
btn.state = 'spaned'
changeBtnImg('topOfListImg','img/spaned.jpg')
tellConsoleSpanSate()
}
}
function bottomOfList()
{
var btn = document.getElementById('bottomOfListBtn')
if(btn.state == 'spaned')
{
var forms = document.getElementsByTagName('form')
var timeSpan = 50
for(var i = 0i<forms.lengthi++)
{
var form = forms[i]
if(form.id.indexOf('Bottom') >-1)
{
ShinkSlowly(form,timeSpan)
timeSpan += 50
}
}
btn.state = 'unspaned'
changeBtnImg('bottomOfListImg','img/unspaned.jpg')
tellConsoleSpanSate()
}
else
{
var forms = document.getElementsByTagName('form')
var timeSpan = 50
for(var i = 0i<forms.lengthi++)
{
var form = forms[i]
if(form.id.indexOf('Bottom') >-1)
{
SpanSlowly(form,timeSpan)
timeSpan += 50
}
}
btn.state = 'spaned'
changeBtnImg('bottomOfListImg','img/spaned.jpg')
tellConsoleSpanSate()
}
}
function ShinkSlowly(form,timeSpan)//控制按钮收缩的函数
{
setTimeout(function()
{
form.style.display = 'none'
}
,timeSpan)
}
function SpanSlowly(form,timeSpan)//控制按钮展开的函数
{
setTimeout(function()
{
form.style.display = ''//alert(form.id)
}
,timeSpan)
}
function changeBtnImg(imgId, imgSrc)
{
document.getElementById(imgId).src=imgSrc//'img/unspaned.jpg''img/spaned.jpg'
}
其中，imgSrc要换成你硬盘里存在的图片路径。然后在你的+号图片的单击事件响应使用topOfList()函数即可，我测试过，可用。ShinkSlowly()函数内部可以控制张开和收缩的速度。
