document.documentElement和document.body区别
区别:
body是DOM对象里的body子节点,即 <body> 标签;
documentElement 是整个节点树的根节点root,即<html> 标签;
没使用DTD情况即怪异模式BackCompat下:
document.documentElement.clientHeight=0document.body.clientHeight=618
使用DTD情况即标准模式CSS1Compat下:
document.documentElement.clientHeight=618 document.body.clientHeight=28(表示内容的高度)
因此提取浏览器的尺寸是要注意了。可以参考以下代码:
if (document.compatMode == "BackCompat") {
cWidth = document.body.clientWidth;
cHeight = document.body.clientHeight;
sWidth = document.body.scrollWidth;
sHeight = document.body.scrollHeight;
sLeft = document.body.scrollLeft;
sTop = document.body.scrollTop;
}
else { //document.compatMode == "CSS1Compat"
cWidth = document.documentElement.clientWidth;
cHeight = document.documentElement.clientHeight;
sWidth = document.documentElement.scrollWidth;
sHeight = document.documentElement.scrollHeight;
sLeft = document.documentElement.scrollLeft == 0 ? document.body.scrollLeft : document.documentElement.scrollLeft;
sTop = document.documentElement.scrollTop == 0 ? document.body.scrollTop : document.documentElement.scrollTop;
}
posted on 2017-03-21 23:16 zhangzongshan 阅读(214) 评论(0) 编辑 收藏 举报