<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
<!--
#box {
height: 130px
width: 310px
border: 1px solid #CECECE
}
#box p {
width: 260px
float: right
margin-top: 20px
margin-right: 0px
margin-bottom: 0px
margin-left: 0px
}
body {
font-size: 12px
margin: 0px
padding: 0px
}
#box .p1 {
font-size: 16px
}
#box .p2 {
color: #999
display: none
}
#box {
position: relative
}
#box a {
display: block
height: 18px
width: 18px
font-size: 18px
text-align: center
line-height: 18px
font-weight: bold
color: #063
border: 1px solid #000
position: absolute
left: 20px
top: 22px
cursor:pointer
}
-->
</style>
</head>
<body>
<div id="box">
<p class="p1">How do Lorem ament, consetetur adipiscing elit?</p>
<p class="p2">Lorem ipsum dolorm upsut Lorem ipsum dolorm upsut Loren ipsum dolorm upsut Lorem ipsum.</p>
<a>+</a>
</div>
</body>
</html>
<script language="javascript">
var a = document.getElementsByTagName('a')[0]
var p2 = document.getElementsByTagName('p')[1]
var temp = 0
a.onclick = function()
{
temp++
if (temp%2==0)
{
this.innerHTML = '+'
p2.style.display = 'none'
}
else
{
this.innerHTML = '-'
p2.style.display = 'block'
}
}
</script>
getnumber[i]是onclick函数外面的变量，进来函数就没了，改成this即可。下面是我做了修改的代码：function clicknumber(){
var getnumber=document.getElementById("test").getElementsByTagName("ul")[0].getElementsByTagName("li")
for( var i=0i<getnumber.lengthi++){
getnumber[i].onclick = function(){
var strtonu = parseInt(this.innerHTML.trim())-1 //这里改了this，数字直接做减一处理，再判断
if(strtonu>0){
this.innerHTML=String(strtonu) //这里改了this
}else{//strtonum为0即隐藏，你原来的代码还会显示0
this.style.display="none" //这里改了this
}
}
}
}
