获取元素绝对位置 position

if(!window.console){
    window.console = {};
    window.console.log = function(){};
}
/**
 * @description 获取元素在页面的绝对位置。可以凑合着用。
 * @author shawn 2012-02-17
 * @param {String|HtmlElement} el DOM元素或者是id
 * @return {Object} {left:offsetLeft,top:offsetTop}
 * BUG:如果元素在table中，计算稍微有点问题。
 */
var getPosition = function(el){
    var self = arguments.callee;
    if(!self.init){
        var ua = navigator.userAgent;
        if(/MSIE ([^;]+)/.test(ua)){
            self.isIE = true;
            self.ieVer = parseInt(RegExp.$1);
        }
        self.getStylePro = function(target,property){
            if(self.isIE){
                if(property == 'float'){
                   property = 'styleFloat';  
                }
                return target.currentStyle[property];
            }else{
                if(property == 'float'){
                   property = 'cssFloat';  
                }
                return document.defaultView.getComputedStyle(target,null)[property];
            }
        };
        self.init = true;
    }
    
    var top = 0,left = 0,
        p = el.offsetParent;
    var floatNd = null;
    
    var bdLeft = 0,
        bdTop = 0;
    if(p){
        do{
            var tagName = p.tagName.toUpperCase();
            console.log("P: " + p.tagName);
            if(self.isIE && self.ieVer < 8){
                if(tagName== 'BODY' || tagName== 'HTML'){
                
                }else{
	                var fl = self.getStylePro(p,'float');
                    var pos = self.getStylePro(p,'position');
                     console.log('pos:' + pos )
	                if('#left#right'.indexOf('#' + fl) != -1){
	                     floatNd = p;   
	                }else if("#TABLE#THEAD#TBODY#TH#TR#TD".indexOf('#'+tagName) == -1){
	                    top += p.offsetTop;
	                    left += p.offsetLeft;
	                }
                    if('#relative#absolute#fixed'.indexOf('#'+pos) != -1){
                        bdLeft = self.getStylePro(p,'borderLeftWidth');
                        bdTop = self.getStylePro(p,'borderTopWidth');
                        top += isNaN(parseInt(bdTop,10)) ? 0 : parseInt(bdTop,10);
                        left += isNaN(parseInt(bdLeft,10)) ? 0: parseInt(bdLeft,10);
                    }
                }                    
		    }else{
                if("#TABLE#THEAD#TBODY#TH#TR#TD".indexOf('#'+tagName) == -1){
		            top += p.offsetTop;
		            left += p.offsetLeft;
		        }                
                if(!self.isIE && /Opera/.test(navigator.userAgent) == false){
                        bdLeft = self.getStylePro(p,'borderLeftWidth');
                        bdTop = self.getStylePro(p,'borderTopWidth');
                        top += parseInt(bdTop,10);
                        left += parseInt(bdLeft,10);
                    }
                    
            }
        }while(p = p.offsetParent);
    }
    
    
    var offset = getOffset(el);
    if(floatNd){
        console.log('float')
        left += (floatNd.offsetLeft+2);
        top += (floatNd.offsetTop+2);
        if(self.isIE && self.ieVer < 8){
            left -= 2;
            top -= 2;
        }
    }
    return {'x':(left+offset.left),'y':(top+offset.top)};
}