clientWidth = width - border 
clientHeight = height - border 
offsetWidth = width 
offsetHeight = height 

clientWidth = width + padding 
clientHeight = height + padding 
offsetWidth = width + padding + border 
offsetHeight = height + padding + border 

var winWidth = 0;  
var winHeight = 0;  
function findDimensions() //函數(shù)：獲取尺寸  
{  //獲取窗口寬度  
if (window.innerWidth)  
winWidth = window.innerWidth;  
else if ((document.body) && (document.body.clientWidth))  
winWidth = document.body.clientWidth;  //獲取窗口高度  
if (window.innerHeight)  
winHeight = window.innerHeight;  
else if ((document.body) && (document.body.clientHeight))  
winHeight = document.body.clientHeight;  //通過深入Document內(nèi)部對(duì)body進(jìn)行檢測(cè)，獲取窗口大小  
if (document.documentElement  && document.documentElement.clientHeight && document.documentElement.clientWidth)  
{  
winHeight = document.documentElement.clientHeight;  
winWidth = document.documentElement.clientWidth;  
}  //結(jié)果輸出至兩個(gè)文本框  
document.form1.availHeight.value= winHeight;  
document.form1.availWidth.value= winWidth;  
}  findDimensions();  //調(diào)用函數(shù)，獲取數(shù)值  
window.onresize=findDimensions;