document.documentElement和document.body区别介绍

Posted 2020-06-18

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; 
}