JavaScript 图片切割效果(带拖拽,缩放,区域限制

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 JavaScript 图片切割效果(带拖拽,缩放,区域限制)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<html xmlns=" http://www.w3.org/1999/xhtml ">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript 图片切割效果(带拖放、缩放效果) </title>
</head>
<body>

<style type="text/css">
#rRightDown,#rLeftDown,#rLeftUp,#rRightUp,#rRight,#rLeft,#rUp,#rDown{position:absolute;background:#F00;width:5px; height:5px; z-index:500; font-size:0;}
#dragDiv{border:1px solid #000000;}
</style>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td width="50%"><div id="bgDiv" style="width:400px; height:500px;">
        <div id="dragDiv">
          <div id="rRightDown" style="right:0; bottom:0;"> </div>
          <div id="rLeftDown" style="left:0; bottom:0;"> </div>
          <div id="rRightUp" style="right:0; top:0;"> </div>
          <div id="rLeftUp" style="left:0; top:0;"> </div>
          <div id="rRight" style="right:0; top:50%;"> </div>
          <div id="rLeft" style="left:0; top:50%;"> </div>
          <div id="rUp" style="top:0; left:50%;"> </div>
          <div id="rDown" style="bottom:0;left:50%;"></div>
        </div>
      </div></td>
    <td><div id="viewDiv" style="width:200px; height:200px;"> </div></td>
  </tr>
</table>
<script>

var $ = function (id) {
    return "string" == typeof id ? document.getElementById(id) : id;
};

var isIE = (document.all) ? true : false;

function addEventHandler(oTarget, sEventType, fnHandler) {
 if (oTarget.addEventListener) {
  oTarget.addEventListener(sEventType, fnHandler, false);
 } else if (oTarget.attachEvent) {
  oTarget.attachEvent("on" + sEventType, fnHandler);
 } else {
  oTarget["on" + sEventType] = fnHandler;
 }
};

function removeEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.removeEventListener) {
        oTarget.removeEventListener(sEventType, fnHandler, false);
    } else if (oTarget.detachEvent) {
        oTarget.detachEvent("on" + sEventType, fnHandler);
    } else {
        oTarget["on" + sEventType] = null;
    }
};


var Class = {
  create: function() {
    return function() {
      this.initialize.apply(this, arguments);
    }
  }
}

Object.extend = function(destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }
    return destination;
}

//拖放程序
var Drag = Class.create();
Drag.prototype = {
  //拖放对象,触发对象
  initialize: function(obj, drag, options) {
    var oThis = this;
 
 this._obj = $(obj);//拖放对象
 this.Drag = $(drag);//触发对象
 this._x = this._y = 0;//记录鼠标相对拖放对象的位置
 //事件对象(用于移除事件)
 this._fM = function(e){ oThis.Move(window.event || e); }
 this._fS = function(){ oThis.Stop(); }
 
 this.SetOptions(options);
 
 this.Limit = !!this.options.Limit;
 this.mxLeft = parseInt(this.options.mxLeft);
 this.mxRight = parseInt(this.options.mxRight);
 this.mxTop = parseInt(this.options.mxTop);
 this.mxBottom = parseInt(this.options.mxBottom);
 
 this.onMove = this.options.onMove;
 
 this._obj.style.position = "absolute";
 addEventHandler(this.Drag, "mousedown", function(e){ oThis.Start(window.event || e); });
  },
  //设置默认属性
  SetOptions: function(options) {
    this.options = {//默认值
  Limit:  false,//是否设置限制(为true时下面参数有用,可以是负数)
  mxLeft:  0,//左边限制
  mxRight: 0,//右边限制
  mxTop:  0,//上边限制
  mxBottom: 0,//下边限制
  onMove:  function(){}//移动时执行
    };
    Object.extend(this.options, options || {});
  },
  //准备拖动
  Start: function(oEvent) {
 //记录鼠标相对拖放对象的位置
 this._x = oEvent.clientX - this._obj.offsetLeft;
 this._y = oEvent.clientY - this._obj.offsetTop;
 //mousemove时移动 mouseup时停止
 addEventHandler(document, "mousemove", this._fM);
 addEventHandler(document, "mouseup", this._fS);
 //使鼠标移到窗口外也能释放
 if(isIE){
  addEventHandler(this.Drag, "losecapture", this._fS);
  this.Drag.setCapture();
 }else{
  addEventHandler(window, "blur", this._fS);
 }
  },
  //拖动
  Move: function(oEvent) {
 //清除选择(ie设置捕获后默认带这个)
 window.getSelection && window.getSelection().removeAllRanges();
 //当前鼠标位置减去相对拖放对象的位置得到offset位置
 var iLeft = oEvent.clientX - this._x, iTop = oEvent.clientY - this._y;
 //设置范围限制
 if(this.Limit){
  //获取超出长度
  var iRight = iLeft + this._obj.offsetWidth - this.mxRight, iBottom = iTop + this._obj.offsetHeight - this.mxBottom;
  //这里是先设置右边下边再设置左边上边,可能会不准确
  if(iRight > 0) iLeft -= iRight;
  if(iBottom > 0) iTop -= iBottom;
  if(this.mxLeft > iLeft) iLeft = this.mxLeft;
  if(this.mxTop > iTop) iTop = this.mxTop;
 }
 //设置位置
 this._obj.style.left = iLeft + "px";
 this._obj.style.top = iTop + "px";
 //附加程序
 this.onMove();
  },
  //停止拖动
  Stop: function() {
 //移除事件
 removeEventHandler(document, "mousemove", this._fM);
 removeEventHandler(document, "mouseup", this._fS);
 if(isIE){
  removeEventHandler(this.Drag, "losecapture", this._fS);
  this.Drag.releaseCapture();
 }else{
  removeEventHandler(window, "blur", this._fS);
 }
  }
};

//缩放程序
var Resize = Class.create();
Resize.prototype = {
  //缩放对象
  initialize: function(obj, options) {
    var oThis = this;
 
 this._obj = $(obj);//缩放对象
 this._right = this._down = this._left = this._up = 0;//坐标参数
 this._scale = 1;//比例参数
 this._touch = null;//当前触发对象
 
 //用currentStyle(ff用getComputedStyle)取得最终样式
 var _style = this._obj.currentStyle || document.defaultView.getComputedStyle(this._obj, null);
 this._xBorder = parseInt(_style.borderLeftWidth) + parseInt(_style.borderRightWidth);
 this._yBorder = parseInt(_style.borderTopWidth) + parseInt(_style.borderBottomWidth);
 
 //事件对象(用于移除事件)
 this._fR = function(e){ oThis.Resize(e); }
 this._fS = function(){ oThis.Stop(); }
 
 this.SetOptions(options);
 
 this.Limit = !!this.options.Limit;
 this.mxLeft = parseInt(this.options.mxLeft);
 this.mxRight = parseInt(this.options.mxRight);
 this.mxTop = parseInt(this.options.mxTop);
 this.mxBottom = parseInt(this.options.mxBottom);
 
 this.MinWidth = parseInt(this.options.MinWidth);
 this.MinHeight = parseInt(this.options.MinHeight);
 this.Scale = !!this.options.Scale;
 this.onResize = this.options.onResize;
 
 this._obj.style.position = "absolute";
  },
  //设置默认属性
  SetOptions: function(options) {
    this.options = {//默认值
  Limit:  false,//是否设置限制(为true时下面mx参数有用)
  mxLeft:  0,//左边限制
  mxRight: 0,//右边限制
  mxTop:  0,//上边限制
  mxBottom: 0,//下边限制
  MinWidth: 50,//最小宽度
  MinHeight: 50,//最小高度
  Scale:  false,//是否按比例缩放
  onResize: function(){}//缩放时执行
    };
    Object.extend(this.options, options || {});
  },
  //设置触发对象
  Set: function(resize, side) {
 var oThis = this, resize = $(resize), _fun, _cursor;
 if(!resize) return;
 //根据方向设置 _fun是缩放时执行的程序 _cursor是鼠标样式
 switch (side.toLowerCase()) {
 case "up" :
  _fun = function(e){ if(oThis.Scale){ oThis.scaleUpRight(e); }else{ oThis.SetUp(e); } };
  _cursor = "n-resize";
  break;
 case "down" :
  _fun = function(e){ if(oThis.Scale){ oThis.scaleDownRight(e); }else{ oThis.SetDown(e); } };
  _cursor = "n-resize";
  break;
 case "left" :
  _fun = function(e){ if(oThis.Scale){ oThis.scaleLeftUp(e); }else{ oThis.SetLeft(e); } };
  _cursor = "e-resize";
  break;
 case "right" :
  _fun = function(e){ if(oThis.Scale){ oThis.scaleRightDown(e); }else{ oThis.SetRight(e); } };
  _cursor = "e-resize";
  break;
 case "left-up" :
  _fun = function(e){ if(oThis.Scale){ oThis.scaleLeftUp(e); }else{ oThis.SetLeft(e); oThis.SetUp(e); } };
  _cursor = "nw-resize";
  break;
 case "right-up" :
  _fun = function(e){ if(oThis.Scale){ oThis.scaleRightUp(e); }else{ oThis.SetRight(e); oThis.SetUp(e); } };
  _cursor = "ne-resize";
  break;
 case "left-down" :
  _fun = function(e){ if(oThis.Scale){ oThis.scaleLeftDown(e); }else{ oThis.SetLeft(e); oThis.SetDown(e); } };
  _cursor = "ne-resize";
  break;
 case "right-down" :
 default :
  _fun = function(e){ if(oThis.Scale){ oThis.scaleRightDown(e); }else{ oThis.SetRight(e); oThis.SetDown(e); } };
  _cursor = "nw-resize";
 }
 //插入字符解决ff下捕获效的问题
 if(!isIE){ resize.innerHTML = "<font size='1px'>&nbsp;</font>"; }
 //设置触发对象
 resize.style.cursor = _cursor;
 addEventHandler(resize, "mousedown", function(e){ oThis._fun = _fun; oThis._touch = resize; oThis.Start(window.event || e); });
  },
  //准备缩放
  Start: function(oEvent, o) {
 //防止冒泡
 if(isIE){ oEvent.cancelBubble = true; } else { oEvent.stopPropagation(); }
 //计算样式初始值
 this.style_width = this._obj.offsetWidth;
 this.style_height = this._obj.offsetHeight;
 this.style_left = this._obj.offsetLeft;
 this.style_top = this._obj.offsetTop;
 //设置缩放比例
 if(this.Scale){ this._scale = this.style_width / this.style_height; }
 //计算当前边的对应另一条边的坐标 例如右边缩放时需要左边界坐标
 this._left = oEvent.clientX - this.style_width;
 this._right = oEvent.clientX + this.style_width;
 this._up = oEvent.clientY - this.style_height;
 this._down = oEvent.clientY + this.style_height;
 //如果有范围 先计算好范围内最大宽度和高度
 if(this.Limit){
  this._mxRight = this.mxRight - this._obj.offsetLeft;
  this._mxDown = this.mxBottom - this._obj.offsetTop;
  this._mxLeft = this.mxLeft + this.style_width + this._obj.offsetLeft;
  this._mxUp = this.mxTop + this.style_height + this._obj.offsetTop;
 }
 //mousemove时缩放 mouseup时停止
 addEventHandler(document, "mousemove", this._fR);
 addEventHandler(document, "mouseup", this._fS);
 
 //使鼠标移到窗口外也能释放
 if(isIE){
  addEventHandler(this._touch, "losecapture", this._fS);
  this._touch.setCapture();
 }else{
  addEventHandler(window, "blur", this._fS);
 }
  },
  //缩放
  Resize: function(e) {
 //没有触发对象的话返回
 if(!this._touch) return;
 //清除选择(ie设置捕获后默认带这个)
 window.getSelection && window.getSelection().removeAllRanges();
 //执行缩放程序
 this._fun(window.event || e);
 //设置样式
 //因为计算用的offset是把边框算进去的所以要减去
 this._obj.style.width = this.style_width - this._xBorder + "px";
 this._obj.style.height = this.style_height - this._yBorder + "px";
 this._obj.style.top = this.style_top + "px";
 this._obj.style.left = this.style_left + "px";
 //附加程序
 this.onResize();
  },
  //普通缩放
  //右边
  SetRight: function(oEvent) {
 //当前坐标位置减去左边的坐标等于当前宽度
 this.repairRight(oEvent.clientX - this._left);
  },
  //下边
  SetDown: function(oEvent) {
 this.repairDown(oEvent.clientY - this._up);
  },
  //左边
  SetLeft: function(oEvent) {
 //右边的坐标减去当前坐标位置等于当前宽度
 this.repairLeft(this._right - oEvent.clientX);
  },
  //上边
  SetUp: function(oEvent) {
 this.repairUp(this._down - oEvent.clientY);
  },
  //比例缩放
  //比例缩放右下
  scaleRightDown: function(oEvent) {
 //先计算宽度然后按比例计算高度最后根据确定的高度计算宽度(宽度优先)
 this.SetRight(oEvent);
 this.repairDown(parseInt(this.style_width / this._scale));
 this.repairRight(parseInt(this.style_height * this._scale));
  },
  //比例缩放左下
  scaleLeftDown: function(oEvent) {
 this.SetLeft(oEvent);
 this.repairDown(parseInt(this.style_width / this._scale));
 this.repairLeft(parseInt(this.style_height * this._scale));
  },
  //比例缩放右上
  scaleRightUp: function(oEvent) {
 this.SetRight(oEvent);
 this.repairUp(parseInt(this.style_width / this._scale));
 this.repairRight(parseInt(this.style_height * this._scale));
  },
  //比例缩放左上
  scaleLeftUp: function(oEvent) {
 this.SetLeft(oEvent);
 this.repairUp(parseInt(this.style_width / this._scale));
 this.repairLeft(parseInt(this.style_height * this._scale));
  },
  //这里是高度优先用于上下两边(体验更好)
  //比例缩放下右
  scaleDownRight: function(oEvent) {
 this.SetDown(oEvent);
 this.repairRight(parseInt(this.style_height * this._scale));
 this.repairDown(parseInt(this.style_width / this._scale));
  },
  //比例缩放上右
  scaleUpRight: function(oEvent) {
 this.SetUp(oEvent);
 this.repairRight(parseInt(this.style_height * this._scale));
 this.repairUp(parseInt(this.style_width / this._scale));
  },
  //修正程序
  //修正右边
  repairRight: function(iWidth) {
 //右边和下边只要设置宽度和高度就行
 //当少于最少宽度
 if (iWidth < this.MinWidth){ iWidth = this.MinWidth; }
 //当超过当前设定的最大宽度
 if(this.Limit && iWidth > this._mxRight){ iWidth = this._mxRight; }
 //修改样式
 this.style_width = iWidth;
  },
  //修正下边
  repairDown: function(iHeight) {
 if (iHeight < this.MinHeight){ iHeight = this.MinHeight; }
 if(this.Limit && iHeight > this._mxDown){ iHeight = this._mxDown; }
 this.style_height = iHeight;
  },
  //修正左边
  repairLeft: function(iWidth) {
 //左边和上边比较麻烦 因为还要计算left和top
 //当少于最少宽度
 if (iWidth < this.MinWidth){ iWidth = this.MinWidth; }
 //当超过当前设定的最大宽度
 else if(this.Limit && iWidth > this._mxLeft){ iWidth = this._mxLeft; }
 //修改样式
 this.style_width = iWidth;
 this.style_left = this._obj.offsetLeft + this._obj.offsetWidth - iWidth;
  },
  //修正上边
  repairUp: function(iHeight) {
 if(iHeight < this.MinHeight){ iHeight = this.MinHeight; }
 else if(this.Limit && iHeight > this._mxUp){ iHeight = this._mxUp; }
 this.style_height = iHeight;
 this.style_top = this._obj.offsetTop + this._obj.offsetHeight - iHeight;
  },
  //停止缩放
  Stop: function() {
 //移除事件
 removeEventHandler(document, "mousemove", this._fR);
 removeEventHandler(document, "mouseup", this._fS);
 if(isIE){
  removeEventHandler(this._touch, "losecapture", this._fS);
  this._touch.releaseCapture();
 }else{
  removeEventHandler(window, "blur", this._fS);
 }
 this._touch = null;
  }
};


//图片切割
var ImgCropper = Class.create();
ImgCropper.prototype = {
  //容器对象,拖放缩放对象,图片地址,宽度,高度
  initialize: function(container, drag, url, width, height, options) {
 var oThis = this;
 
 //容器对象
 this.Container = $(container);
 this.Container.style.position = "relative";
 this.Container.style.overflow = "hidden";
 
 //拖放对象
 this.Drag = $(drag);
 this.Drag.style.cursor = "move";
 this.Drag.style.zIndex = 200;
 if(isIE){
  //设置overflow解决ie6的渲染问题(缩放时填充对象高度的问题)
  this.Drag.style.overflow = "hidden";
  //ie下用一个透明的层填充拖放对象 不填充的话onmousedown会失效(未知原因)
  (function(style){
   style.width = style.height = "100%"; style.backgroundColor = "#fff"; style.filter = "alpha(opacity:0)";
  })(this.Drag.appendChild(document.createElement("div")).style)
 }else{
  //插入字符解决ff下捕获失效的问题
  this.Drag.innerHTML += "<font size='1px'>&nbsp;</font>";
 }
 
 this._pic = this.Container.appendChild(document.createElement("img"));//图片对象
 this._cropper = this.Container.appendChild(document.createElement("img"));//切割对象
 this._pic.style.position = this._cropper.style.position = "absolute";
 this._pic.style.top = this._pic.style.left = this._cropper.style.top = this._cropper.style.left = "0";//对齐
 this._cropper.style.zIndex = 100;
 this._cropper.onload = function(){ oThis.SetPos(); }
 
 this.Url = url;//图片地址
 this.Width = parseInt(width);//宽度
 this.Height = parseInt(height);//高度
 
 this.SetOptions(options);
 
 this.Opacity = parseInt(this.options.Opacity);
 this.dragTop = parseInt(this.options.dragTop);
 this.dragLeft = parseInt(this.options.dragLeft);
 this.dragWidth = parseInt(this.options.dragWidth);
 this.dragHeight = parseInt(this.options.dragHeight);
 
 //设置预览对象
 this.View = $(this.options.View) || null;//预览对象
 this.viewWidth = parseInt(this.options.viewWidth);
 this.viewHeight = parseInt(this.options.viewHeight);
 this._view = null;//预览图片对象
 if(this.View){
  this.View.style.position = "relative";
  this.View.style.overflow = "hidden";
  this._view = this.View.appendChild(document.createElement("img"));
  this._view.style.position = "absolute";
 }
 
 this.Scale = parseInt(this.options.Scale);
 
 //设置拖放
 this._drag = new Drag(this.Drag, this.Drag, { Limit: true, onMove: function(){ oThis.SetPos(); } });
 //设置缩放
 this._resize = this.GetResize();
 
 this.Init();
  },
  //设置默认属性
  SetOptions: function(options) {
    this.options = {//默认值
  Opacity: 50,//透明度(0到100)
  //拖放位置和宽高
  dragTop: 0,
  dragLeft: 0,
  dragWidth: 100,
  dragHeight: 100,
  //缩放触发对象
  Right:  "",
  Left:  "",
  Up:   "",
  Down:  "",
  RightDown: "",
  LeftDown: "",
  RightUp: "",
  LeftUp:  "",
  Scale:  false,//是否按比例缩放
  //预览对象设置
  View: "",//预览对象
  viewWidth: 100,//预览宽度
  viewHeight: 100//预览高度
    };
    Object.extend(this.options, options || {});
  },
  //初始化对象
  Init: function() {
 var oThis = this;
 
 //设置容器
 this.Container.style.width = this.Width + "px";
 this.Container.style.height = this.Height + "px";
 
 //设置拖放对象
 this.Drag.style.top = this.dragTop + "px";
 this.Drag.style.left = this.dragLeft + "px";
 this.Drag.style.width = this.dragWidth + "px";
 this.Drag.style.height = this.dragHeight + "px";
 
 //设置切割对象
 this._pic.src = this._cropper.src = this.Url;
 this._pic.style.width = this._cropper.style.width = this.Width + "px";
 this._pic.style.height = this._cropper.style.height = this.Height + "px";
 if(isIE){
  this._pic.style.filter = "alpha(opacity:" + this.Opacity + ")";
 } else {
  this._pic.style.opacity = this.Opacity / 100;
 }
 
 //设置预览对象
 if(this.View){ this._view.src = this.Url; }
 
 //设置拖放
 this._drag.mxRight = this.Width; this._drag.mxBottom = this.Height;
 //设置缩放
 if(this._resize){ this._resize.mxRight = this.Width; this._resize.mxBottom = this.Height; this._resize.Scale = this.Scale; }
  },
  //设置获取缩放对象
  GetResize: function() {
 var op = this.options;
 //有触发对象时才设置
 if(op.RightDown || op.LeftDown || op.RightUp || op.LeftUp || op.Right || op.Left || op.Up || op.Down ){
  var oThis = this, _resize = new Resize(this.Drag, { Limit: true, onResize: function(){ oThis.SetPos(); } });
 
  //设置缩放触发对象
  if(op.RightDown){ _resize.Set(op.RightDown, "right-down"); }
  if(op.LeftDown){ _resize.Set(op.LeftDown, "left-down"); }
 
  if(op.RightUp){ _resize.Set(op.RightUp, "right-up"); }
  if(op.LeftUp){ _resize.Set(op.LeftUp, "left-up"); }
 
  if(op.Right){ _resize.Set(op.Right, "right"); }
  if(op.Left){ _resize.Set(op.Left, "left"); }
 
  if(op.Up){ _resize.Set(op.Up, "up"); }
  if(op.Down){ _resize.Set(op.Down, "down"); }
 
  return _resize;
 } else { return null; }
  },
  //设置切割
  SetPos: function() {
 var o = this.Drag;
 //按拖放对象的参数进行切割
 this._cropper.style.clip = "rect(" + o.offsetTop + "px " + (o.offsetLeft + o.offsetWidth) + "px " + (o.offsetTop + o.offsetHeight) + "px " + o.offsetLeft + "px)";
 //切割预览
 if(this.View) this.PreView();
  },
  //切割预览
  PreView: function() {
 //按比例设置宽度和高度
 var o = this.Drag, h = this.viewWidth, w = h * o.offsetWidth / o.offsetHeight;
 if(w > this.viewHeight){ w = this.viewHeight; h = w * o.offsetHeight / o.offsetWidth; }
 //获取对应比例尺寸
 var scale = h / o.offsetHeight, ph = this.Height * scale, pw = this.Width * scale, pt = o.offsetTop * scale, pl = o.offsetLeft * scale, styleView = this._view.style;
 //设置样式
 styleView.width = pw + "px"; styleView.height = ph + "px";
 styleView.top = - pt + "px "; styleView.left = - pl + "px";
 //切割预览图
 styleView.clip = "rect(" + pt + "px " + (pl + w) + "px " + (pt + h) + "px " + pl + "px)";
  }
}

var ic = new ImgCropper("bgDiv", "dragDiv", " http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_min.jpg ", 400, 500, {
 dragTop: 50, dragLeft: 50,
 Right: "rRight", Left: "rLeft", Up: "rUp", Down: "rDown",
 RightDown: "rRightDown", LeftDown: "rLeftDown", RightUp: "rRightUp", LeftUp: "rLeftUp",
 View: "viewDiv", viewWidth: 200, viewHeight: 200
})
</script>
<script>

//设置图片大小
function Size(w, h){
 ic.Width = w;
 ic.Height = h;
 ic.Init();
}
//换图片
function Pic(url){
 ic.Url = url;
 ic.Init();
}
//设置透明度
function Opacity(i){
 ic.Opacity = i;
 ic.Init();
}
//是否使用比例
function Scale(b){
 ic.Scale = b;
 ic.Init();
}


</script>
<br />
<br />
<div>
  <input name="" type="button" value=" 增肥 " onclick="Size(500,400)" />
  <input name="" type="button" value=" 还原 " onclick="Size(300,400)" />
</div>

<br />
<div>
  <input name="" type="button" value=" 换图 " onclick="Pic('http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_min.jpg')" />
  <input name="" type="button" value=" 还原 " onclick="Pic('http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_xx2.jpg')" />
</div>

<br />
<div>
  <input name="" type="button" value=" 透明 " onclick="Opacity(0)" />
  <input name="" type="button" value=" 还原 " onclick="Opacity(50)" />
</div>

<br />
<div>
  <input name="" type="button" value="使用比例" onclick="Scale(true)" />
  <input name="" type="button" value="取消比例" onclick="Scale(false)" />
</div>

</body>
</html>

 

运行效果图:

  JavaScript 图片切割效果(带拖拽,缩放,区域限制)

JavaScript 图片切割效果(带拖拽,缩放,区域限制)


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