clientX,clientY,x,y等的区别[转]
clientX, clientY是鼠标当前相对于网页的位置，当鼠标位于页面左上角时clientX=0, clientY=0；
offsetX, offsetY是鼠标当前相对于网页中的某一区域的位置，当鼠标位于页面中这一区域的左上角时offsetX=0, offsetY=0；
screenX, screenY是相对于用户显示器的位置
x,y是鼠标相对于当前浏览器的位置
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD><TITLE>Measure for Measure</TITLE>
<SCRIPT>
<!--
function one() {
report.value = "The DIV above is relatively positioned in the BODY. The style object contains the information that was set in the inline style to position this object. The following are the values that would be reported for the various position and dimension properties on the style object for the DIV:" + "\n\n";
report.value= report.value + " mydiv.style.top (string) = " + foodiv.style.top + "\n";
report.value= report.value + " mydiv.style.left (string) = " + foodiv.style.left + "\n";
report.value= report.value + " mydiv.style.height (string) = " + foodiv.style.height + "\n";
report.value= report.value + " mydiv.style.width (string) = " + foodiv.style.width + "\n";
report.value= report.value + " mydiv.style.pixelTop (long) = " + foodiv.style.pixelTop + "\n";
report.value= report.value + " mydiv.style.pixelLeft (long) = " + foodiv.style.pixelLeft + "\n";
report.value= report.value + " mydiv.style.pixelHeight (long) = " + foodiv.style.pixelHeight + "\n";
report.value= report.value + " mydiv.style.pixelWidth (long) = " + foodiv.style.pixelWidth + "\n";
report.value= report.value + " mydiv.style.posTop (long) = " + foodiv.style.posTop + "\n";
report.value= report.value + " mydiv.style.posLeft (long) = " + foodiv.style.posLeft + "\n";
report.value= report.value + " mydiv.style.posHeight (long) = " + foodiv.style.posHeight + "\n";
report.value= report.value + " mydiv.style.posWidth (long) = " + foodiv.style.posWidth + "\n";
}
function two() {
report.value = "Each object has a set of offset positions. The offset properties for the positioned darkBlue DIV above are: \n";
report.value= report.value + " offsetLeft = " + foodiv.offsetLeft + "\n";
report.value= report.value + " offsetTop = " + foodiv.offsetTop + "\n";
report.value= report.value + " offsetHeight = " + foodiv.offsetHeight + "\n";
report.value= report.value + " offsetWidth = " + foodiv.offsetWidth + "\n";
report.value= report.value + " offsetLeft = " + document.body.offsetLeft + "\n";
report.value= report.value + " offsetTop = " + document.body.offsetTop + "\n";
report.value= report.value + " offsetHeight = " + document.body.offsetHeight + "\n";
report.value= report.value + " offsetWidth = " + document.body.offsetWidth + "\n";
}
function three() {
report.value = "Scroll values for the darkBlue DIV object" + "\n";
report.value= report.value + " scrollLeft = " + foodiv.scrollLeft + "\n";
report.value= report.value + " scrollTop = " + foodiv.scrollTop + "\n";
report.value= report.value + " scrollHeight = " + foodiv.scrollHeight + "\n";
report.value= report.value + " scrollWidth = " + foodiv.scrollWidth + "\n";
report.value = report.value + "Scroll values for the BODY" + "\n";
report.value= report.value + " scrollLeft = " + document.body.scrollLeft + "\n";
report.value= report.value + " scrollTop = " + document.body.scrollTop + "\n";
report.value= report.value + " scrollHeight = " + document.body.scrollHeight + "\n";
report.value= report.value + " scrollWidth = " + document.body.scrollWidth + "\n";
}
function four() {
report.value = "";
report.value= report.value + " clientHeight for the BODY: " + document.body.clientHeight + "\n";
report.value= report.value + " clientWidth for the BODY:" + document.body.clientWidth + "\n";
report.value= report.value + " clientTop for the BODY:" + document.body.clientTop + "\n";
report.value= report.value + " clientLeft for the BODY:" + document.body.clientLeft + "\n";
report.value= report.value + " clientHeight for this TEXTAREA:" + report.clientHeight + "\n";
report.value= report.value + " clientWidth for this TEXTAREA: " + report.clientWidth + "\n";
report.value= report.value + " clientTop for this TEXTAREA:" + document.body.clientTop + "\n";
report.value= report.value + " clientLeft for this TEXTAREA:" + document.body.clientLeft + "\n";
}
function five() {
report.value = "You clicked the mouse in the input button. The following reports the various x and y values that are passed on the event object for this mouse click event \n";
report.value= report.value + " window.event.x = " + window.event.x + "\n";
report.value= report.value + " window.event.y = " + window.event.y + "\n";
report.value= report.value + " window.event.offsetX = " + window.event.offsetX + "\n";
report.value= report.value + " window.event.offsetY = " + window.event.offsetY + "\n";
report.value= report.value + " window.event.screenX = " + window.event.screenX + "\n";
report.value= report.value + " window.event.screenY = " + window.event.screenY + "\n";
report.value= report.value + " window.event.clientX = " + window.event.clientX + "\n";
report.value= report.value + " window.event.clientY = " + window.event.clientY + "\n";
}
-->
</script>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=iso-8859-1">
<META NAME="AUTHOR" CONTENT="InetSDK">
<META NAME="MS.LOCALE" CONTENT="EN-US">
<META NAME="ROBOTS" CONTENT="noindex">
<!-- SAMPLE_STYLE_START -->
<LINK REL="stylesheet" HREF="/workshop/basicSDKIE4.css" TYPE="text/css">
<!-- SAMPLE_STYLE_END -->
</HEAD>
<!--TOOLBAR_START-->
<!--TOOLBAR_EXEMPT-->
<!--TOOLBAR_END-->
<BODY style="border:lightBlue solid 15;margin:10px;padding:10px;background-color:navy;font-family:arial" LINK="#FFFFFF" VLINK="#808080" ALINK="#000000">
<DIV id="foodiv" style="position:relative;top:5;left:5;height:150;width:200;overflow:scroll;margin:20px;background-color:white;padding:20px;border-color:lightBlue;border-width:10;border-style:solid">
DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool!
</DIV>
<input type=button onclick=one() value="Style Positions" style="background-color:lightBlue;font-family:arial">
<input type=button onclick=two() value="Object Offset" style="background-color:lightBlue;font-family:arial">
<input type=button onclick=three() value="Scroll Positions" style="background-color:lightBlue;font-family:arial">
<input type=button onclick=four() value="Client Area" style="background-color:lightBlue;font-family:arial">
<input type=button onclick=five() value="Event Object" style="background-color:lightBlue;font-family:arial">
<BR>
<center id="title"></center>
<TEXTAREA id="report" rows=10 cols=50 wrap=physical style="font-family:arial">
</TEXTAREA>
<!-- START_PAGE_FOOTER -->
<BR><BR><BR>
© <A CLASS="clsIncCpyRt" HREF="../isapi/gomscom.asp@target=_2Fmisc_2Fcpyright.htm" TARGET="_top">Microsoft Corporation. All rights reserved. Terms of use</A>.
<!-- END_PAGE_FOOTER -->
</BODY>
</HTML>
回复：
问：解释一下event.X和event.clientX有什么区别？
答：
event.clientX返回事件发生时,mouse相对于客户窗口的X坐标
event.X也一样
但是如果设置事件对象的定位属性值为relative
event.clientX不变
而event.X返回事件对象的相对于本体的坐标
event对象详解 ICOOE 2000.3.31 http://www.51js.com/
event代表事件的状态，例如事件发生的的元素、鼠标的位置等等，event对象只在事件过程中才有效。
event属性：
altKey
检索ALT键的当前状态
可能的值 true为关闭
false为不关闭
button
检索按下的鼠标键
可能的值： 0 没按键
1 按左键
2 按右键
3 按左右键
4 按中间键
5 按左键和中间键
6 按右键和中间键
7 按所有的键
cancelBubble
设置或检索当前事件是否将事件句柄起泡
可能的值： false 启用起泡
true 取消该事件起泡
clientX
检索与窗口客户区域有关的鼠标光标的X坐标，属性为只读，没有默认值。
clientY
检索与窗口客户区域有关的鼠标光标的Y坐标，属性为只读，没有默认值。
ctrlKey
ctrlKey 检索CTRL键的当前状态
可能的值 true为关闭
false为不关闭
dataFld
检索被oncellchange事伯影响的列
aTransfer
为拖放操作提供预先定义的剪贴板式。
Element
检索在on mouseover和on mouseout事件期间退出的对象指针
keyCode
设置或检索与引发事件的关键字相关联的Unicode关键字代码
该属性与onkeydown onkeyup onkeypress一起使用
如果没有引发事件的关键字，则该值为0
offsetX
检索与触发事件的对象相关的鼠标位置的水平坐标
offsetY
检索与触发事件的对象相关的鼠标位置的垂直坐标
propertyName
检索在对象上己更改的特性的名称
reason
检索数据源对象数据传输的结果
可能的值：
0 数据传输成功
1 数据传输失败
2 数据传输错误
recordset
检索数据源对象中默认记录集的引用
该特性为只读
repeat
检索一个事件是否被重复
该属性只有在onkeydown事件重复时才返回true
returnvalues
设置或检索从事件中返回的值
可能的值：
true 事件中的值被返回
false 源对象上事件的默认操作被取消
screenX
检索与用户屏相关的鼠标的水平位置
screenY
检索与用户屏相关的鼠标的垂直位置
shiftKey
检索shiftKey键的当前状态
可能的值 true为关闭
false为不关闭
srcElement
检索触发事件的对象
srcFilter
检索导致onfilterchange事件触发的过滤器对象
srcUm
检索触发事件行为的同一资源名称
除非下面两个条件都为真，否则该特性被设置为null
1.行为被附加到触发事件的要素上
2.在前面的项目符号中定义的行为己指定了一个URN标识符和己触发的事件
toElement
检索作为on mouseover或者on mouseout事件结果而移动的对象
type
检索事件对象中的事件名称
x
检索相对于父要素鼠标水平坐标的整数
y
检索相对于父要素鼠标垂直坐标的整数
x:设置或者是得到鼠标相对于目标事件的父元素的外边界在x坐标上的位置。
clientX:相对于客户区域的x坐标位置，不包括滚动条，就是正文区域。
offsetx：设置或者是得到鼠标相对于目标事件的父元素的内边界在x坐标上的位置。
screenX:相对于用户屏幕。
offsetX, offsetY是鼠标当前相对于网页中的某一区域的位置，当鼠标位于页面中这一区域的左上角时offsetX=0, offsetY=0；
screenX, screenY是相对于用户显示器的位置
x,y是鼠标相对于当前浏览器的位置
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD><TITLE>Measure for Measure</TITLE>
<SCRIPT>
<!--
function one() {
report.value = "The DIV above is relatively positioned in the BODY. The style object contains the information that was set in the inline style to position this object. The following are the values that would be reported for the various position and dimension properties on the style object for the DIV:" + "\n\n";
report.value= report.value + " mydiv.style.top (string) = " + foodiv.style.top + "\n";
report.value= report.value + " mydiv.style.left (string) = " + foodiv.style.left + "\n";
report.value= report.value + " mydiv.style.height (string) = " + foodiv.style.height + "\n";
report.value= report.value + " mydiv.style.width (string) = " + foodiv.style.width + "\n";
report.value= report.value + " mydiv.style.pixelTop (long) = " + foodiv.style.pixelTop + "\n";
report.value= report.value + " mydiv.style.pixelLeft (long) = " + foodiv.style.pixelLeft + "\n";
report.value= report.value + " mydiv.style.pixelHeight (long) = " + foodiv.style.pixelHeight + "\n";
report.value= report.value + " mydiv.style.pixelWidth (long) = " + foodiv.style.pixelWidth + "\n";
report.value= report.value + " mydiv.style.posTop (long) = " + foodiv.style.posTop + "\n";
report.value= report.value + " mydiv.style.posLeft (long) = " + foodiv.style.posLeft + "\n";
report.value= report.value + " mydiv.style.posHeight (long) = " + foodiv.style.posHeight + "\n";
report.value= report.value + " mydiv.style.posWidth (long) = " + foodiv.style.posWidth + "\n";
}
function two() {
report.value = "Each object has a set of offset positions. The offset properties for the positioned darkBlue DIV above are: \n";
report.value= report.value + " offsetLeft = " + foodiv.offsetLeft + "\n";
report.value= report.value + " offsetTop = " + foodiv.offsetTop + "\n";
report.value= report.value + " offsetHeight = " + foodiv.offsetHeight + "\n";
report.value= report.value + " offsetWidth = " + foodiv.offsetWidth + "\n";
report.value= report.value + " offsetLeft = " + document.body.offsetLeft + "\n";
report.value= report.value + " offsetTop = " + document.body.offsetTop + "\n";
report.value= report.value + " offsetHeight = " + document.body.offsetHeight + "\n";
report.value= report.value + " offsetWidth = " + document.body.offsetWidth + "\n";
}
function three() {
report.value = "Scroll values for the darkBlue DIV object" + "\n";
report.value= report.value + " scrollLeft = " + foodiv.scrollLeft + "\n";
report.value= report.value + " scrollTop = " + foodiv.scrollTop + "\n";
report.value= report.value + " scrollHeight = " + foodiv.scrollHeight + "\n";
report.value= report.value + " scrollWidth = " + foodiv.scrollWidth + "\n";
report.value = report.value + "Scroll values for the BODY" + "\n";
report.value= report.value + " scrollLeft = " + document.body.scrollLeft + "\n";
report.value= report.value + " scrollTop = " + document.body.scrollTop + "\n";
report.value= report.value + " scrollHeight = " + document.body.scrollHeight + "\n";
report.value= report.value + " scrollWidth = " + document.body.scrollWidth + "\n";
}
function four() {
report.value = "";
report.value= report.value + " clientHeight for the BODY: " + document.body.clientHeight + "\n";
report.value= report.value + " clientWidth for the BODY:" + document.body.clientWidth + "\n";
report.value= report.value + " clientTop for the BODY:" + document.body.clientTop + "\n";
report.value= report.value + " clientLeft for the BODY:" + document.body.clientLeft + "\n";
report.value= report.value + " clientHeight for this TEXTAREA:" + report.clientHeight + "\n";
report.value= report.value + " clientWidth for this TEXTAREA: " + report.clientWidth + "\n";
report.value= report.value + " clientTop for this TEXTAREA:" + document.body.clientTop + "\n";
report.value= report.value + " clientLeft for this TEXTAREA:" + document.body.clientLeft + "\n";
}
function five() {
report.value = "You clicked the mouse in the input button. The following reports the various x and y values that are passed on the event object for this mouse click event \n";
report.value= report.value + " window.event.x = " + window.event.x + "\n";
report.value= report.value + " window.event.y = " + window.event.y + "\n";
report.value= report.value + " window.event.offsetX = " + window.event.offsetX + "\n";
report.value= report.value + " window.event.offsetY = " + window.event.offsetY + "\n";
report.value= report.value + " window.event.screenX = " + window.event.screenX + "\n";
report.value= report.value + " window.event.screenY = " + window.event.screenY + "\n";
report.value= report.value + " window.event.clientX = " + window.event.clientX + "\n";
report.value= report.value + " window.event.clientY = " + window.event.clientY + "\n";
}
-->
</script>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=iso-8859-1">
<META NAME="AUTHOR" CONTENT="InetSDK">
<META NAME="MS.LOCALE" CONTENT="EN-US">
<META NAME="ROBOTS" CONTENT="noindex">
<!-- SAMPLE_STYLE_START -->
<LINK REL="stylesheet" HREF="/workshop/basicSDKIE4.css" TYPE="text/css">
<!-- SAMPLE_STYLE_END -->
</HEAD>
<!--TOOLBAR_START-->
<!--TOOLBAR_EXEMPT-->
<!--TOOLBAR_END-->
<BODY style="border:lightBlue solid 15;margin:10px;padding:10px;background-color:navy;font-family:arial" LINK="#FFFFFF" VLINK="#808080" ALINK="#000000">
<DIV id="foodiv" style="position:relative;top:5;left:5;height:150;width:200;overflow:scroll;margin:20px;background-color:white;padding:20px;border-color:lightBlue;border-width:10;border-style:solid">
DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool! DHTML is so cool!
</DIV>
<input type=button onclick=one() value="Style Positions" style="background-color:lightBlue;font-family:arial">
<input type=button onclick=two() value="Object Offset" style="background-color:lightBlue;font-family:arial">
<input type=button onclick=three() value="Scroll Positions" style="background-color:lightBlue;font-family:arial">
<input type=button onclick=four() value="Client Area" style="background-color:lightBlue;font-family:arial">
<input type=button onclick=five() value="Event Object" style="background-color:lightBlue;font-family:arial">
<BR>
<center id="title"></center>
<TEXTAREA id="report" rows=10 cols=50 wrap=physical style="font-family:arial">
</TEXTAREA>
<!-- START_PAGE_FOOTER -->
<BR><BR><BR>
© <A CLASS="clsIncCpyRt" HREF="../isapi/gomscom.asp@target=_2Fmisc_2Fcpyright.htm" TARGET="_top">Microsoft Corporation. All rights reserved. Terms of use</A>.
<!-- END_PAGE_FOOTER -->
</BODY>
</HTML>
回复：
问：解释一下event.X和event.clientX有什么区别？
答：
event.clientX返回事件发生时,mouse相对于客户窗口的X坐标
event.X也一样
但是如果设置事件对象的定位属性值为relative
event.clientX不变
而event.X返回事件对象的相对于本体的坐标
event对象详解 ICOOE 2000.3.31 http://www.51js.com/
event代表事件的状态，例如事件发生的的元素、鼠标的位置等等，event对象只在事件过程中才有效。
event属性：
altKey
检索ALT键的当前状态
可能的值 true为关闭
false为不关闭
button
检索按下的鼠标键
可能的值： 0 没按键
1 按左键
2 按右键
3 按左右键
4 按中间键
5 按左键和中间键
6 按右键和中间键
7 按所有的键
cancelBubble
设置或检索当前事件是否将事件句柄起泡
可能的值： false 启用起泡
true 取消该事件起泡
clientX
检索与窗口客户区域有关的鼠标光标的X坐标，属性为只读，没有默认值。
clientY
检索与窗口客户区域有关的鼠标光标的Y坐标，属性为只读，没有默认值。
ctrlKey
ctrlKey 检索CTRL键的当前状态
可能的值 true为关闭
false为不关闭
dataFld
检索被oncellchange事伯影响的列
aTransfer
为拖放操作提供预先定义的剪贴板式。
Element
检索在on mouseover和on mouseout事件期间退出的对象指针
keyCode
设置或检索与引发事件的关键字相关联的Unicode关键字代码
该属性与onkeydown onkeyup onkeypress一起使用
如果没有引发事件的关键字，则该值为0
offsetX
检索与触发事件的对象相关的鼠标位置的水平坐标
offsetY
检索与触发事件的对象相关的鼠标位置的垂直坐标
propertyName
检索在对象上己更改的特性的名称
reason
检索数据源对象数据传输的结果
可能的值：
0 数据传输成功
1 数据传输失败
2 数据传输错误
recordset
检索数据源对象中默认记录集的引用
该特性为只读
repeat
检索一个事件是否被重复
该属性只有在onkeydown事件重复时才返回true
returnvalues
设置或检索从事件中返回的值
可能的值：
true 事件中的值被返回
false 源对象上事件的默认操作被取消
screenX
检索与用户屏相关的鼠标的水平位置
screenY
检索与用户屏相关的鼠标的垂直位置
shiftKey
检索shiftKey键的当前状态
可能的值 true为关闭
false为不关闭
srcElement
检索触发事件的对象
srcFilter
检索导致onfilterchange事件触发的过滤器对象
srcUm
检索触发事件行为的同一资源名称
除非下面两个条件都为真，否则该特性被设置为null
1.行为被附加到触发事件的要素上
2.在前面的项目符号中定义的行为己指定了一个URN标识符和己触发的事件
toElement
检索作为on mouseover或者on mouseout事件结果而移动的对象
type
检索事件对象中的事件名称
x
检索相对于父要素鼠标水平坐标的整数
y
检索相对于父要素鼠标垂直坐标的整数
x:设置或者是得到鼠标相对于目标事件的父元素的外边界在x坐标上的位置。
clientX:相对于客户区域的x坐标位置，不包括滚动条，就是正文区域。
offsetx：设置或者是得到鼠标相对于目标事件的父元素的内边界在x坐标上的位置。
screenX:相对于用户屏幕。