笔记备用

1.弹出窗口titleWindow，设置叠加层（父窗口）透明度和模糊度
  modalTransparency="0" ;
  modalTransparencyBlur="0";
2.flex4设置背景图片

	<s:BorderContainer width="400" height="300">
		<s:backgroundFill>
			<s:BitmapFill source="@Embed('/test.png')" fillMode="repeat"/>
		</s:backgroundFill>
	</s:BorderContainer>

3.判断直线与容器是否相交：
  求出直线方程式，容器4个点带入方程式与0的比较结果是否一致

private function getDirection(point:Point, startPoint:Point, endPoint:Point):String
{
	//根据数学,求出直接的表达示:y=kx+b   
	var direction:String;
	
	var g:Number;
	
	if (startPoint.x != endPoint.x )
	{
		var k:Number=(startPoint.y - endPoint.y) / (startPoint.x - endPoint.x);
		var b:Number=startPoint.y - k * startPoint.x;
		g = point.y - k*point.x - b;
		if(g<0){
			direction = "top";
		}else if(g>0){
			direction = "bottom";
		}else{
			direction = "middle";
		}

	}
	else
	{
		g = point.x - startPoint.x;
		if(g>0){
			direction = "right";
		}else if(g<0){
			direction = "left";
		}else{
			direction = "center";
		}
	}
	return direction;
}

4.遍历object属性

var objInfo:Object=ObjectUtil.getClassInfo(student); //flex ObjectUtil工具类
				var fieldName:Array=objInfo["properties"] as Array;
				var param:String="";
				for each (var q:QName in fieldName)
				{
					//q.localName 属性名称，value对应的值 
					var value:String=student[q.localName];
					param = param + q.localName + ":" + value +";";
				}