//调用方式：zoomImg(this,150,150)
var flag = false;
function zoomImg(imgT,iwidth,iheight){	//需处理的图片，允许的宽度，允许的高度
	var img = new Image();
	img.src = imgT.src;
	
	if(img.width > 0 && img.height > 0){
		flag = true;
		if(img.width/img.height >= iwidth/iheight){
			if(img.width > iwidth){
				imgT.width = iwidth;
				imgT.height = (img.height * iwidth)/img.width;
			}else{ //维持原图大小
				//imgT.width = iwidth;
				//imgT.height = (img.height * img.width)/iwidth;
				imgT.width = img.width;
				imgT.height = img.height;
			}
		}else{
			if(img.height > iheight){
				imgT.width = (img.width * iheight)/img.height;
				imgT.height = iheight;
			}else{
				//imgT.width = (img.width * img.height)/iheight;
				//imgT.height = iheight;
				imgT.width = img.width;
				imgT.height = img.height;
			}
		}
	}
}


//等比例压缩(可一边压缩)
function AutoResizeImage(objImg,maxWidth,maxHeight){
	var img = new Image();
	img.src = objImg.src;
	var hRatio;
	var wRatio;
	var Ratio = 1;
	var w = img.width;
	var h = img.height;
	wRatio = maxWidth / w;
	hRatio = maxHeight / h;
	if (maxWidth ==0 && maxHeight==0){
		Ratio = 1;
	}else if (maxWidth==0){
		if (hRatio<1) Ratio = hRatio;
	}else if (maxHeight==0){
		if (wRatio<1) Ratio = wRatio;
	}else if (wRatio<1 || hRatio<1){
		Ratio = (wRatio<=hRatio?wRatio:hRatio);
	}
	if (Ratio<1){
		w = w * Ratio;
		h = h * Ratio;
	}
	objImg.height = h;
	objImg.width = w;
}


//图片缩放(可填充空白)  
function rectDrawImage(ImgD,FitWidth,FitHeight){
	var image=new Image();
	image.src=ImgD.src;
	if(image.width>0 && image.height>0){
		if(image.width/image.height>= FitWidth/FitHeight){
			if(image.width>FitWidth){
				ImgD.width=FitWidth;
				ImgD.height=(image.height*FitWidth)/image.width;
			}else{
				ImgD.width=image.width;
				ImgD.height=image.height;
			}
		}else{
			if(image.height>FitHeight){
				ImgD.height=FitHeight;
				ImgD.width=(image.width*FitHeight)/image.height;
			}else{
				ImgD.width=image.width;
				ImgD.height=image.height;
			}
		}
	}
	//图片高小于设定的边框高时，让图片上下居中 padding 为内边距
	if(ImgD.height < FitHeight ){
		var paddH = parseInt((FitHeight - ImgD.height)/2);
		ImgD.style.paddingTop = paddH + "px";
		ImgD.style.paddingBottom = paddH + "px";
	}
	//图片宽小于设定的边框宽时，让图片左右居中 padding 为内边距
	if(ImgD.width < FitWidth ){
		var paddW = parseInt((FitWidth - ImgD.width)/2);
		ImgD.style.paddingLeft = paddW + "px";
		ImgD.style.paddingRight = paddW + "px";
	}
}


//获取元素
function getElemClass(oParent, sClass){
	var _parent = document.getElementById(oParent).getElementsByTagName("*");
	var array = [];
	if(_parent){
		for(var i=0;i<_parent.length;i++){
			if(_parent[i].className == sClass){
				array.push(_parent[i]);
			}
		}
	}
	return array;
}

//获取样式
function getStyle(obj,attr){
	return obj.currentStyle ? obj.currentStyle[attr] : document.defaultView.getComputedStyle(obj, null)[attr];
}
//缓冲效果
function doMoveBuffer(obj, json, fx, fn){
	obj.timer && clearInterval(obj.timer);
	obj.timer = setInterval(function(){
		var bStop = true,
			mType = 1, //缓动类型
			attr = null,
			cur = 0;
		
		for(attr in json){	
			cur = attr == 'opacity' ? parseInt(parseFloat(getStyle(obj, attr)).toFixed(2)*100) : parseInt(getStyle(obj, attr));
			if(!obj.speed) obj.speed = {};
			if(!obj.speed[attr]) obj.speed[attr] = 0;
			//平滑缓动效果
			if(mType == 1){
				if(cur != json[attr]){
					bStop = false;
					
					obj.speed[attr] = (json[attr] - cur)/fx;
					obj.speed[attr] = obj.speed[attr] > 0 ? Math.ceil(obj.speed[attr]) : Math.floor(obj.speed[attr]);
				}
			}
			//反弹缓动效果
			else{
				if(Math.abs(json[attr]-cur)>=1 || Math.abs(obj.speed[attr])>=1){
					bStop=false;
					
					obj.speed[attr] += (json[attr] - cur)/fx;
					obj.speed[attr] *= 0.7;
				}
			}
			
			if(attr == 'opacity'){
				obj.style.filter = 'alpha(opacity:'+(cur+obj.speed[attr])+')';
				obj.style.opacity = (cur+obj.speed[attr])/100;
			}else{
				obj.style[attr] = (cur+obj.speed[attr]) + 'px';
			}
			if(bStop){
				clearInterval(obj.timer);
				obj.timer = null;
				
				fn && fn.call(obj);
			}
		}
	}, 30);
}