对象位置的获取

 

 

 

 

  //得到某个对象的绝对top

  function getAbsoluteTop(ob){  
	  if(!ob){return null;}  
	  var mendingOb = ob;  
	  var mendingTop = mendingOb .offsetTop;  
	  while( mendingOb != null && mendingOb .offsetParent != null 
			  && mendingOb .offsetParent.tagName != "BODY" ){  
	      mendingTop += mendingOb .offsetParent.offsetTop;  
	      mendingOb = mendingOb .offsetParent;  
	  }  
	   
	  return mendingTop ;  
   }  

 

 

  //得到某个对象的绝对left

 

 function getAbsoluteLeft(ob){  
	  if(!ob){return null;}  
	      var mendingOb = ob;  
	      var mendingLeft = mendingOb .offsetLeft;  
	      while( mendingOb != null && mendingOb .offsetParent != null 
	    		  && mendingOb .offsetParent.tagName != "BODY" ){  
	        mendingLeft += mendingOb .offsetParent.offsetLeft;  
	        mendingOb = mendingOb .offsetParent;  
	      }  
	  return mendingLeft ;  
   }  
  

 

  //得到对象的宽高 ，以及位置

  function getPosition( domEle ){
	  var position={};
	  position.x = parseFloat(domEle.offsetLeft);
	  position.y = parseFloat(domEle.offsetTop);
	  position.width = domEle.clientWidth;
	  position.height = domEle.clientHeight;
	  position.absoluteLeft = getAbsoluteLeft(domEle);
	  position.absoluteTop =  getAbsoluteTop(domEle);
	  return position;
  }

 

 

  得到页面的一些数字信息

	 //得到屏幕的宽高 ，以及位置
	basic.getViewData = function (){
		  var position = {};
		  //滚动条的顶部
		  position.scrollTop = window.pageYOffset  //用于FF
	      	 || document.documentElement.scrollTop   // 有w3c说明的
	     	 || document.body.scrollTop    //w3c 为0 
	     	 || 0;
		  
		  var scrollHeight1 =  document.documentElement.scrollHeight   // 有w3c说明的
		  	 || document.body.scrollHeight    //w3c 为0 
		  	 || 0;
		  //整个页面的高度
		  position.scrollHeight = Math.max(scrollHeight1,position.scrollTop );
		  //滚动条左边位置
		  position.scrollLeft = window.pageXOffset 
		  	 || document.documentElement.scrollLeft
		  	 || document.body.scrollLeft
		  	 || 0;
		  //页面宽度
		  position.width = document.documentElement.clientWidth
		  	 || document.body.clientWidth
		  	 || window.innerWidth
		  	 || 0;
		  //页面高度
	 	  position.height = document.documentElement.clientHeight
	 	  	 || document.body.clientHeight
	 	  	 || window.innerHeight ; // 兼容 opera 
	 	  
		  return position;
	 }