JS中offsetTop、clientTop、scrollTop、offsetTop各属性介绍

这里是javascript中制作滚动代码的常用属性页可见区域宽： document.body.clientWidth;
网页可见区域高： document.body.clientHeight;
网页可见区域宽： document.body.offsetWidth   (包括边线的宽);
网页可见区域高： document.body.offsetHeight (包括边线的宽);
网页正文全文宽： document.body.scrollWidth;
网页正文全文高： document.body.scrollHeight;
网页被卷去的高： document.body.scrollTop;
网页被卷去的左： document.body.scrollLeft;
网页正文部分上： window.screenTop;
网页正文部分左： window.screenLeft;
屏幕分辨率的高： window.screen.height;
屏幕分辨率的宽： window.screen.width;
屏幕可用工作区高度： window.screen.availHeight; 

 1、offsetLeft假设 obj 为某个 HTML 控件。obj.offsetTop 指 obj 距离上方或上层控件的位置，整型，单位像素。obj.offsetLeft 指 obj 距离左方或上层控件的位置，整型，单位像素。obj.offsetWidth 指 obj 控件自身的宽度，整型，单位像素。obj.offsetHeight 指 obj 控件自身的高度，整型，单位像素。我们对前面提到的“上方或上层”与“左方或上层”控件作个说明。例如：    “提交”按钮的 offsetTop 指“提交”按钮距“tool”层上边框的距离，因为距其上边最近的是 “tool” 层的上边框。“重置”按钮的 offsetTop 指“重置”按钮距“tool”层上边框的距离，因为距其上边最近的是 “tool” 层的上边框。“提交”按钮的 offsetLeft 指“提交”按钮距“tool”层左边框的距离，因为距其左边最近的是 “tool” 层的左边框。“重置”按钮的 offsetLeft 指“重置”按钮距“提交”按钮右边框的距离，因为距其左边最近的是“提交”按钮的右边框。以上属性在 FireFox 中也有效。另 外：我们这里所说的是指 HTML 控件的属性值，并不是 document.body，document.body 的值在不同浏览器中有不同解释（实际上大多数环境是由于对 document.body 解释不同造成的，并不是由于对 offset 解释不同造成的），点击这里查看不同点。标题：offsetTop 与 style.top 的区别预备知识：offsetTop、offsetLeft、offsetWidth、offsetHeight我们知道 offsetTop 可以获得 HTML 元素距离上方或外层元素的位置，style.top 也是可以的，二者的区别是：一、offsetTop 返回的是数字，而 style.top 返回的是字符串，除了数字外还带有单位：px。二、offsetTop 只读，而 style.top 可读写。三、如果没有给 HTML 元素指定过 top 样式，则 style.top 返回的是空字符串。offsetLeft 与 style.left、offsetWidth 与 style.width、offsetHeight 与 style.height 也是同样道理。标题：clientHeight、offsetHeight和scrollHeight我们这里说说四种浏览器对 document.body 的 clientHeight、offsetHeight 和 scrollHeight 的解释，这里说的是 document.body，如果是 HTML 控件，则又有不同，点击这里查看。这四种浏览器分别为IE（Internet Explorer）、NS（Netscape）、Opera、FF（FireFox）。2、clientHeightclientHeight大家对 clientHeight 都没有什么异议，都认为是内容可视区域的高度，也就是说页面浏览器中可以看到内容的这个区域的高度，一般是最后一个工具条以下到状态栏以上的这个区域，与页面内容无关。offsetHeightIE、Opera 认为 offsetHeight = clientHeight + 滚动条 + 边框。NS、FF 认为 offsetHeight 是网页内容实际高度，可以小于 clientHeight。scrollHeightIE、Opera 认为 scrollHeight 是网页内容实际高度，可以小于 clientHeight。NS、FF 认为 scrollHeight 是网页内容高度，不过最小值是 clientHeight。简单地说clientHeight 就是透过浏览器看内容的这个区域高度。NS、 FF 认为 offsetHeight 和 scrollHeight 都是网页内容高度，只不过当网页内容高度小于等于 clientHeight 时，scrollHeight 的值是 clientHeight，而 offsetHeight 可以小于 clientHeight。IE、Opera 认为 offsetHeight 是可视区域 clientHeight 滚动条加边框。scrollHeight 则是网页内容实际高度。同理clientWidth、offsetWidth 和 scrollWidth 的解释与上面相同，只是把高度换成宽度即可。但是FF 在不同的 DOCTYPE 中对 clientHeight 的解释不同， xhtml 1 trasitional 中则不是如上解释的。其它浏览器则不存在此问题。标题：scrollTop、scrollLeft、scrollWidth、scrollHeight3、scrollLeftscrollTop 是“卷”起来的高度值，示例： 如果为 p 设置了 scrollTop，这些内容可能不会完全显示。 var p = document.getElementById("p");p.scrollTop = 10; 由于为外层元素 p 设置了 scrollTop，所以内层元素会向上卷。scrollLeft 也是类似道理。我们已经知道 offsetHeight 是自身元素的宽度。而 scrollHeight 是内部元素的绝对宽度，包含内部元素的隐藏的部分。上述中 p 的 scrollHeight 为 300，而 p 的 offsetHeight 为 100。scrollWidth 也是类似道理。IE 和 FireFox 全面支持，而 Netscape 和 Opera 不支持 scrollTop、scrollLeft（document.body 除外）。发表时间：2007-10-15 20:20:16标题：offsetTop、offsetLeft、offsetWidth、offsetHeight4、clientLeft  返回对象的offsetLeft属性值和到当前窗口左边的真实值之间的距离，可以理解为边框的长度一直以来对offsetLeft，offsetTop，scrollLeft，scrollTop这几个方法很迷糊，花了一天的时间好好的学习了一下．得出了以下的结果：1.offsetTop     :当前对象到其上级层顶部的距离.不能对其进行赋值.设置对象到页面顶部的距离请用style.top属性.2.offsetLeft :当前对象到其上级层左边的距离.不能对其进行赋值.设置对象到页面左部的距离请用style.left属性.3.offsetWidth :当前对象的宽度.与style.width属性的区别在于:如对象的宽度设定值为百分比宽度,则无论页面变大还是变小,style.width都返回此百分比,而offsetWidth则返回在不同页面中对象的宽度值而不是百分比值4.offsetHeight :与style.height属性的区别在于:如对象的宽度设定值为百分比高度,则无论页面变大还是变小,style.height都返回此百分比,而offsetHeight则返回在不同页面中对象的高度值而不是百分比值5.offsetParent   :当前对象的上级层对象.注意.如果对象是包括在一个DIV中时,此DIV不会被当做是此对象的上级层,(即对象的上级层会跳过DIV对象)上级层是Table时则不会有问题.利用这个属性，可以得到当前对象在不同大小的页面中的绝对位置．得到绝对位置脚本代码

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overflow: visible !important; !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; min-height: inherit !important; color: blue !important;" >"\r\n"de> de style="margin: 0px !important; padding: 0px !important; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; background-image: none !important; border: 0px !important; bottom: auto !important; float: none !important; left: auto !important; outline: 0px !important; overflow: visible !important; !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; min-height: inherit !important; color: black !important;" >+ de>de style="margin: 0px !important; padding: 0px !important; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; background-image: none !important; border: 0px !important; bottom: auto !important; float: none !important; left: auto !important; outline: 0px !important; overflow: visible !important; !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; min-height: inherit !important; color: blue !important;" >"Top   Is : "de> de style="margin: 0px !important; padding: 0px !important; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; background-image: none !important; border: 0px !important; bottom: auto !important; float: none !important; left: auto !important; outline: 0px !important; overflow: visible !important; !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; min-height: inherit !important; color: black !important;" >+ top);de> de style="margin: 0px !important; padding: 0px !important; border-top-left-radius: 0px !important; border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; background-image: none !important; border: 0px !important; bottom: auto !important; float: none !important; left: auto !important; outline: 0px !important; overflow: visible !important; !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; min-height: inherit !important; color: black !important;" >}de>

6.scrollLeft :对象的最左边到对象在当前窗口显示的范围内的左边的距离．即是在出现了横向滚动条的情况下，滚动条拉动的距离．7.scrollTop对象的最顶部到对象在当前窗口显示的范围内的顶边的距离．即是在出现了纵向滚动条的情况下，滚动条拉动的距离．我们这里说说四种浏览器对 document.body 的 clientHeight、offsetHeight 和 scrollHeight 的解释，这里说的是 document.body，如果是 HTML 控件，则又有不同，点击这里查看。这四种浏览器分别为IE（Internet Explorer）、NS（Netscape）、Opera、FF（FireFox）。clientHeight大家对 clientHeight 都没有什么异议，都认为是内容可视区域的高度，也就是说页面浏览器中可以看到内容的这个区域的高度，一般是最后一个工具条以下到状态栏以上的这个区域，与页面内容无关。offsetHeightIE、Opera 认为 offsetHeight = clientHeight + 滚动条 + 边框。NS、FF 认为 offsetHeight 是网页内容实际高度，可以小于 clientHeight。scrollHeightIE、Opera 认为 scrollHeight 是网页内容实际高度，可以小于 clientHeight。NS、FF 认为 scrollHeight 是网页内容高度，不过最小值是 clientHeight。简单地说clientHeight 就是透过浏览器看内容的这个区域高度。NS、 FF 认为 offsetHeight 和 scrollHeight 都是网页内容高度，只不过当网页内容高度小于等于 clientHeight 时，scrollHeight 的值是 clientHeight，而 offsetHeight 可以小于 clientHeight。IE、Opera 认为 offsetHeight 是可视区域 clientHeight 滚动条加边框。scrollHeight 则是网页内容实际高度。同理clientWidth、offsetWidth 和 scrollWidth 的解释与上面相同，只是把高度换成宽度即可。