//取得瀏覽大小JS的類，兼容多種瀏覽器
//屬性
//.width	寬度
//.height	高度
//.scrollWidth	帶滾動條的寬度
//.scrollHeight	帶滾動條的高度
//.scrollTop	內容高度
function browserInfo(){
	if(document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight || document.documentElement.scrollTop)){
    	this.width = document.documentElement.clientWidth;
		this.height = document.documentElement.clientHeight;
		this.scrollTop = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop;
		this.scrollWidth = document.documentElement.scrollWidth;
		this.scrollHeight = document.documentElement.scrollHeight > document.documentElement.clientHeight ? document.documentElement.scrollHeight : document.documentElement.clientHeight;
	} else if(document.body && (document.body.clientWidth || document.body.clientHeight || document.body.scrollTop)){
		this.width = document.body.clientWidth;
		this.height = document.body.clientHeight;
		this.scrollTop = document.body.scrollTop;
		this.scrollWidth = document.body.scrollWidth;
		this.scrollHeight = document.body.scrollHeight > document.body.clientHeight ? document.body.scrollHeight : document.body.clientHeight;
	} else {
		this.width = 0;
		this.height = 0;
		this.scrollTop = 0;
		this.scrollWidth = 0;
		this.scrollHeight = 0;
	}
	if(typeof(window.innerWidth) == 'number' || typeof(window.innerHeight ) == 'number' ){
		this.width = window.innerWidth > this.width ? window.innerWidth : this.width;
		this.height = this.hieght ? this.height : window.innerHeight;
		this.scrollWidth = window.innerWidth > this.scrollWidth ? window.innerWidth : this.scrollWidth;
		this.scrollHeight = this.scrollHeight > window.innerHeight ? this.scrollHeight : window.innerHeight;
	} 
	if(document.body && document.body.clientWidth){
		this.scrollWidth = this.scrollWidth > document.body.scrollWidth ? this.scrollWidth : document.body.scrollWidth;
	}
}