代码如下:
//--------------------弹出层-------------------
//popDivId:弹出层div的ID
//dragDivId:用于拖动div的ID
//isShowMask:是否显示遮罩层
function
popDivShow(popDivId,
dragDivId,
isShowMask)
{
if
(isShowMask)
{
creatMask(popDivId)
}
var
oWins
=
document.getElementById(popDivId)
var
oWins_title
=
document.getElementById(dragDivId)
var
bDrag
=
false
var
disX
=
disY
=
0
oWins.style.display
=
"block"
oWins_title.onmousedown
=
function(event)
{
var
event
=
event
||
window.event
bDrag
=
true
disX
=
event.clientX
-
oWins.offsetLeft
disY
=
event.clientY
-
oWins.offsetTop
this.setCapture
&&
this.setCapture()
return
false
}
document.onmousemove
=
function(event)
{
if
(!bDrag)
return
var
event
=
event
||
window.event
var
iL
=
event.clientX
-
disX
var
iT
=
event.clientY
-
disY
var
maxL
=
document.documentElement.clientWidth
-
oWins.offsetWidth
var
maxT
=
document.documentElement.clientHeight
-
oWins.offsetHeight
iL
=
iL
<
0
?
0
:
iL
iL
=
iL
>
maxL
?
maxL
:
iL
iT
=
iT
<
0
?
0
:
iT
iT
=
iT
>
maxT
?
maxT
:
iT
oWins.style.marginTop
=
oWins.style.marginLeft
=
0
oWins.style.left
=
iL
+
"px"
oWins.style.top
=
iT
+
"px"
return
false
}
document.onmouseup
=
window.onblur
=
oWins_title.onlosecapture
=
function()
{
bDrag
=
false
oWins_title.releaseCapture
&&
oWins_title.releaseCapture()
}
}
//
隐藏弹出层
function
popDivHidden(popDivId)
{
var
oWins
=
document.getElementById(popDivId)
oWins.style.display
=
"none"
window.parent.document.body.removeChild(window.parent.document.getElementById("maskDiv"))
}
//
获取弹出层的zIndex
function
getZindex(popDivId)
{
var
popDiv
=
document.getElementById(popDivId)
var
popDivZindex
=
popDiv.style.zIndex
return
popDivZindex
}
//
创建遮罩层
function
creatMask(popDivId)
{
//
参数w为弹出页面的宽度,参数h为弹出页面的高度,参数s为弹出页面的路径
var
maskDiv
=
window.parent.document.createElement("div")
maskDiv.id
=
"maskDiv"
maskDiv.style.position
=
"fixed"
maskDiv.style.top
=
"0"
maskDiv.style.left
=
"0"
maskDiv.style.zIndex
=
getZindex(popDivId)
-
1
maskDiv.style.backgroundColor
=
"#333"
maskDiv.style.filter
=
"alpha(opacity=70)"
maskDiv.style.opacity
=
"0.7"
maskDiv.style.width
=
"100%"
maskDiv.style.height
=
(window.parent.document.body.scrollHeight
+
50)
+
"px"
window.parent.document.body.appendChild(maskDiv)
maskDiv.onmousedown
=
function()
{
window.parent.document.body.removeChild(window.parent.document.getElementById("maskDiv"))
}
}
css中z-index的默认值是auto这是属性自带的属性值。平时自己设置一般是数字，最小值是0，没有最大值一说。
默认值会依据你当前页面设置的相关index来设置，比如你设置了一个为0，那么默认auto就会小于0，就是说0会显示在auto的上面，最大最小值和浏览器的支持有关，一般都是包含我们常用的值
document.getElementById('domId').style.zIndex = 9600大多数css样式，都可以通过dom.style.css来获取或设置它的值，其中css就是类似于zIndex等属性。而且有一个特点，就是css属性中，凡事中线+字母的，都要把中线+字母换成该字母的大写，比如上面的z-index就要换成zIndex，font-size就要换成fontSize等等。
