介绍一款web端的截图工具

牛牛截图，web端的一款截图工具，下面是代码及实例。

依赖jquery-1.7.min.js

/*******************************************************************************
牛牛截图的JS部分的核心流程封装在此文件中，绝大部分情况下，您不需要修改此文件中的JS内容，它已经包含了在所有浏览器上应用
牛牛截图所需要的所有代码，您只需要去修改capturewrapper.js，将相应的函数修改成与您的UI匹配的即可
*******************************************************************************/

/*******************************************************************************/
//设置截图的参数
var emPensize = 1;		//设置画笔大小
var emDrawType = 2;		//设置是腾讯风格还是360风格 0： 腾讯风格   1： 360风格
var	emTrackColor = 3;		//自动识别的边框的颜色
var	emEditBorderColor = 4;	//文本输入的边框颜色
var	emTransparent = 5;		//工具栏的透明度
var	emWindowAware = 6;		//设置是否禁用随着DPI放大
var	emSetSaveName = 8;		//设置保存时的开始文字     免费版本无效
var	emSetMagnifierBkColor = 9; //设置放大镜的背景色，不设置则透明
var	emSetMagnifierLogoText = 10; //设置放大镜上的LOGO字符，可提示快捷键，如： 牛牛截图(CTRL + SHIFT + A)     免费版本无效
var emSetWatermarkPictureType = 20;						//设置水印的类型
var	emSetWatermarkPicturePath = 21;						//设置水印的路径
var	emSetWatermarkTextType = 22;						//设置水印文字的类型
var	emSetWatermarkTextValue = 23;                       //设置水印文字的字符串
var emSetMosaicType = 24;               //指定马赛克的类型，1为矩形，2为画线
var emSetTooltipText = 25;               //用于设置工具栏图标的TOOLTIP文字
var emSetMoreInfo = 26;							//设置额外的信息，用于特殊需求
/*******************************************************************************/

var emClosed = 1;
var emConnected = 2;
var emConnecting = 3;

var emCaptureSuccess = 0;
var emCaptureFailed = 1;
var emCaptureUnknown = 2;

var emCmdReady = -1;
var emCmdCapture = 0;
var emCmdSaveFile = 1;

function isMacintosh() {
  return navigator.platform.indexOf('Mac') > -1;
}

function rgb2value(r, g, b)
{
    return r | g << 8 | b << 16;
}

var captureObjSelf = null;
function onpluginLoaded()
{
    captureObjSelf.pluginLoaded();
}

function NiuniuCaptureObject()
{
    var self = this;
    captureObjSelf = this;
    this.PenSize = 2;
    this.DrawType = 0;
    this.TrackColor = rgb2value(255, 0, 0);
    this.EditBorderColor = rgb2value(255, 0, 0);
    this.Transparent = 240;
    this.WindowAware = 1;
    this.MosaicType = 1;
    this.SaveName = "保存";
    this.MagnifierLogoText = "截图";
    this.WatermarkPictureType = "2|100|100|400|400|20";
    this.WatermarkPicturePath = "";
    this.WatermarkTextType = "2|100|100|100|40|20|0|150|30|80,55,55,55";
    this.WatermarkTextValue = "";
    this.NiuniuAuthKey = "";
    this.ToolTipText = "";  //tipRectangle|tipCircle|tipArrow|tipBrush|tipGlitter|tipMosaic|tipText|tipUndo|tipSave|tipCancel|tipFinish|txtFinish
    this.MoreInfo = "1,100|300|600";

    this.useCustomizedProtoco = true;   //是否使用浏览器自定义协议加websocket 

    this.IsWaitCustomizedCallBack = false;
	this.autoConnectAfterPageLoad = true;
	this.IsFirstConnect = true;
	this.IsEverConnected = false;
	this.reconnectTryTime = 0;
	this.TimeIntervalID = -1;
	this.ReceivedEchoBack = false;

	this.Version = "1.0.0.0";
    this.hostPort = "30101,30102";
	this.hostPortIndex = 0;
    this.CaptureName = "NiuniuCapture";
    this.NiuniuSocket = null;
    this.connectState = emClosed;

	this.SocketTimeStamp = new Date().getTime();
	this.TimeOutID = -1;

    this.FinishedCallback = null;
    this.PluginLoadedCallback = null;
    this.VersionCallback = null;
	this.OnConnectFailed = function(isReconnect)
	{
		self.WriteLog(isReconnect ? "reconnect failed, the capture control process is exit." : "connect failed at the first time.");
	}

    this.LoadPlugin = function()
    {
        var obj = $('#capturecontainer');
        if(obj.length < 1)
        {
            $("body").append('<div id="capturecontainer" style="height:0px;width:0px;"></div>');
            obj = $('#capturecontainer');
        }
        obj.html('');
        obj.html('<object id="niuniuCapture" type="application/x-niuniuwebcapture" width="0" height="0"><param name="onload" value="onpluginLoaded" /></object>');

		var iframeObj = $('startCaptureFrame');
		if(iframeObj.length < 1)
		{
			$("body").append('<iframe id="startCaptureFrame" style="display:none;"></iframe>');
		}
    }

    this.niuniuCapture = function ()
    {
        return document.getElementById('niuniuCapture');
    }

    this.addEvent = function(obj, name, func)
    {
        if (obj.attachEvent) {
            obj.attachEvent("on"+name, func);
        } else {
            obj.addEventListener(name, func, false);
        }
    }

    this.pluginValid = function()
    {
        try
        {
            if(self.niuniuCapture().valid)
            {
                return true;
            }
        }
        catch(e)
        {
        }
        return false;
    }

    this.OnCaptureFinished = function(x, y, width, height, content,localpath)
    {
	    self.OnCaptureFinishedEx(1, x, y, width, height, "", content,localpath);
    }

    this.OnCaptureFinishedEx = function(type, x, y, width, height, info, content,localpath)
    {
        //交给上层去处理截图完成后的事项
        if(self.FinishedCallback != null)
        {
            self.FinishedCallback(type, x, y, width, height, info, content,localpath);
        }
        else
        {
            alert("截图完成的事件未绑定，将不能对图片进行处理，请指定FinishedCallback回调函数");
        }
    }

    this.pluginLoaded = function()
    {
		self.GetVersion();
        if(!self.pluginValid())
        {
            if(self.PluginLoadedCallback != null)
            {
                self.PluginLoadedCallback(false);
            }
            return false;
        }   

        //此函数必需调用，传递正确的参数，且必需先于其他函数调用
        self.niuniuCapture().InitCapture(self.NiuniuAuthKey); 

        self.niuniuCapture().InitParam(emPensize, self.PenSize);
        self.niuniuCapture().InitParam(emDrawType, self.DrawType);
        self.niuniuCapture().InitParam(emTrackColor, self.TrackColor);
        self.niuniuCapture().InitParam(emEditBorderColor, self.EditBorderColor);
        self.niuniuCapture().InitParam(emTransparent, self.Transparent);

        self.niuniuCapture().InitParam(emSetSaveName, self.SaveName);
        self.niuniuCapture().InitParam(emSetMagnifierLogoText, self.MagnifierLogoText);
        self.niuniuCapture().InitParam(emSetMosaicType, self.MosaicType);

        //设置工具栏上的按钮TOOLTIP
        self.niuniuCapture().InitParam(emSetTooltipText, self.ToolTipText);

		self.niuniuCapture().InitParam(emSetMoreInfo, self.MoreInfo);
        //niuniuCapture().InitParam(23, "测试文字.");
        //此BASE64字符串表示牛牛默认的水印图片，可以替换
       // niuniuCapture().InitParam(21, "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");
         //注：以上设置LOGO及保存名的接口，免费版本无效

        //添加控件的事件监听
	    self.addEvent(self.niuniuCapture(), 'CaptureFinishedEx', self.OnCaptureFinishedEx);
	    //以下这个事件主要是用于兼容旧的浏览器控件的事件通知
	    self.addEvent(self.niuniuCapture(), 'CaptureFinished', self.OnCaptureFinished);

    	if(self.PluginLoadedCallback != null)
        {
            self.PluginLoadedCallback(true);
        }
    }

    this.SetWatermarkPicture = function(watermarPicData)
    {
          self.WatermarkPicturePath = watermarPicData;
          //设置测试的水印图片的Base64字符串，此操作应该是在页面加载中处理比较合适
          if(!self.pluginValid())
            return;
          self.niuniuCapture().InitParam(emSetWatermarkPicturePath, self.WatermarkPicturePath);
          self.niuniuCapture().InitParam(emSetWatermarkPictureType, self.WatermarkPictureType);
    }

    this.SetWatermarkText = function(watermarkText)
    {
        self.WatermarkTextValue = watermarkText;
        //设置测试的水印文字，此操作应该是在页面加载中处理比较合适
        if(!self.pluginValid())
            return;
		//nShowType|nMinWidth|nMinHeight|nVerticalInterval|nOffset|nFontSize|nIsBold|nTextWidth|nTextHeight|colorText
		 self.niuniuCapture().InitParam(emSetWatermarkTextValue, self.WatermarkTextValue);
         self.niuniuCapture().InitParam(emSetWatermarkTextType, self.WatermarkTextType);
    }

    this.SavePicture = function(savename)
    {
         if(self.pluginValid())
         {
            self.niuniuCapture().SavePicture(savename);
         }
    }

    this.GetCursorPosition = function()
    {
        if(self.pluginValid())
        {
            var val = self.niuniuCapture().GetCursorPosition();
            return val;
        }
        return "";
    }

    this.NewCaptureParamObject = function(defaultpath, hideCurrWindow, autoCaptureFlag, x, y, width, height)
    {
        var obj = new Object();
        obj.CmdType = 1;
        obj.IsGBK = 0;				//是否是GBK编码，这样会涉及到编码转换
        obj.AuthKey = self.NiuniuAuthKey;  //
	    obj.Pensize = self.PenSize;		//设置画笔大小
	    obj.DrawType = self.DrawType;			//设置是腾讯风格还是360风格
	    obj.TrackColor= self.TrackColor;		//自动识别的边框的颜色
	    obj.EditBorderColor= self.EditBorderColor;	//文本输入的边框颜色
	    obj.Transparent = self.Transparent;		//工具栏的透明度
	    obj.SetSaveName = self.SaveName;									//设置保存时的开始文字
	    obj.SetMagnifierLogoText = self.MagnifierLogoText;						//设置放大镜上的LOGO字符
	    obj.SetWatermarkPictureTypeEx = self.WatermarkPictureType;						//设置水印的类型
	    obj.SetWatermarkPicturePath = self.WatermarkPicturePath;						//设置水印的路径
	    obj.SetWatermarkTextTypeEx=self.WatermarkTextType;							//设置水印文字的类型
	    obj.SetWatermarkTextValue= self.WatermarkTextValue;						//设置水印文字
        obj.MosaicType = self.MosaicType;          //设置马赛克的类型
        obj.SetToolbarText = self.ToolTipText;
        obj.MoreInfo = this.MoreInfo;
	    //以下是截图时传递的参数
	    obj.DefaultPath = defaultpath;
	    obj.HideCurrentWindow = hideCurrWindow;
	    obj.AutoCaptureFlag = autoCaptureFlag;
	    obj.x = x;
	    obj.y = y;
	    obj.Width = width;
	    obj.Height = height;
        return obj;
    } 

    this.DoCapture = function(name, hide, AutoCapture, x, y, width, height)
    {
        if(self.IsNeedCustomizedProtocol())
        {
             return self.DoCaptureForCustomize(name, hide, AutoCapture, parseInt(x), parseInt(y), parseInt(width), parseInt(height));
        }

        if(!self.pluginValid())
        {
            return emCaptureFailed;
        }
        self.niuniuCapture().Capture(name, hide, AutoCapture, x, y, width, height);
        return emCaptureSuccess;
    }

    this.InitNiuniuCapture = function()
    {
        self.LoadPlugin();
	    setTimeout("captureObjSelf.InitWebSocketAndBindCallback();", 200);
    }

    this.InitWebSocketAndBindCallback = function()
    {
		if(!self.autoConnectAfterPageLoad || !self.IsNeedCustomizedProtocol())
		{
			return;
		}
	    self.connectHost();
    }

	this.getNextPort = function()
	{
		//init port params flag
		//进行拆分处理 self.hostPort;
		var portArray = self.hostPort.split(",");
		if(portArray.length < 1)
		{
			alert("服务端口为空");
			return 30101;
		}
		if(self.hostPortIndex < 0)
		{
			self.hostPortIndex = 0;
		}
		if(self.hostPortIndex > portArray.length - 1)
		{
			self.hostPortIndex = portArray.length - 1;
		}
		var nPort = parseInt(portArray[self.hostPortIndex]);
		self.hostPortIndex++;
		if(self.hostPortIndex > portArray.length - 1)
		{
			self.hostPortIndex = 0;
		}
		return nPort;
	}

    this.connectHost = function()
    {
			if(self.NiuniuSocket != null)
			{
				self.WriteLog("connectHost NiuniuSocket is not null, return.");
				return;
			}
			clearTimeout(self.TimeOutID);
			self.connectState = emConnecting;

			try{
				var wshosts = ['127.0.0.1', 'localhost'];
				for (var i in wshosts) {
					try{
						var host = "ws://127.0.0.1:" + self.getNextPort() + "/" + self.CaptureName;
						self.NiuniuSocket = new WebSocket(host);
						break;
					}
					catch(ee){
						var ggg= 0;
					}
				}

				//OutputLog('Socket Status: '+socket.readyState);
				self.NiuniuSocket.onopen = function(evt){
					self.NiuniuSocket.send('0' + self.SocketTimeStamp);
					self.WriteLog("NiuniuSocket.onopen.");
					clearTimeout(self.TimeOutID);
				}

				self.NiuniuSocket.onmessage = function(msg){
					var str = "";
					str = msg.data;
					var id  = str.substr(0, 1);
					var arg1 = str.substr(1);
					clearTimeout(self.TimeOutID);
					if(id == "0"){
						self.hostPortIndex--;
						//表示连接成功，此时应该提示可以截图了
						self.connectState = emConnected;
						self.pluginLoaded();
						self.IsEverConnected = true;
						self.IsFirstConnect = false;
						if(self.IsWaitCustomizedCallBack)
						{
						    setTimeout("captureObjSelf.SendReadyRecvData();", 3);
						}
						self.WriteLog("connect sucess.");
						self.ReceivedEchoBack = true;
						clearInterval(self.TimeIntervalID);
						self.TimeIntervalID = setInterval("captureObjSelf.LoopEchoMessage()", 3000);
					}
					if(id == "1"){
						//解析消息
						var _aoResult = eval("(" + arg1 + ")");
						self.ReceivedEchoBack = true;
						if(_aoResult.command == "echo")
						{
							self.WriteLog("received echo");
							return;
						}
						self.WriteLog("received capturedata.");
						if(_aoResult.command == "version")
						{
							self.WriteLog(_aoResult.Ver);
							self.VersionCallback(_aoResult.Ver);
						}
						else{
							self.OnCaptureFinishedEx(_aoResult.Type, _aoResult.x, _aoResult.y, _aoResult.Width, _aoResult.Height, _aoResult.Info, _aoResult.Content, _aoResult.LocalPath);
						}
					}
				}

				self.NiuniuSocket.onclose = function(evt){
					self.OnWebSocketError("self.NiuniuSocket.onclose." + evt.data);
				}
				self.NiuniuSocket.onerror = function (evt) {
					//self.OnWebSocketError("self.NiuniuSocket.onerror." + evt.data);
				  };

			} catch(e){
				self.OnWebSocketError("connect exception." + e.message);
			}
    }

	this.WriteLog = function(txt)
	{
		//写日志
		try{
			console.log(txt);
		}
		catch(e)
		{

		}
	}

	this.OnWebSocketError = function(type)
	{
		//如果不处于连接成功状态，说明不是断开连接，而是连接失败
		var isConnectedFailed = false;
		if(self.connectState != emConnected)
		{
			isConnectedFailed = true;
		}
		self.WriteLog(type);
		self.ReceivedEchoBack = false;
		self.connectState = emClosed;		

		if(self.NiuniuSocket != null)
		{
			self.NiuniuSocket.close();
		}

		self.NiuniuSocket = null;
		clearTimeout(self.TimeOutID);
		clearInterval(self.TimeIntervalID);

		if(isConnectedFailed)
		{
			if(self.IsFirstConnect)
			{
				self.IsFirstConnect = false;
				if(self.OnConnectFailed != null)
				{
					self.OnConnectFailed(false);
				}
				return;
			}

			if(self.IsEverConnected)
			{
				self.reconnectTryTime++;
				//通知连接连接断开
				if(self.reconnectTryTime > 3)
				{
					self.IsEverConnected = false;
					self.reconnectTryTime = 0;
					if(self.OnConnectFailed != null)
					{
						self.OnConnectFailed(true);
					}
					return;
				}
			}
		}

		self.TimeOutID = setTimeout("captureObjSelf.connectHost();", 800);
	}

	this.LoopEchoMessage = function()
	{
		if(!self.ReceivedEchoBack)
		{
			self.OnWebSocketError("this.LoopEchoMessage, !self.ReceivedEchoBack");
			self.ReceivedEchoBack = false;
			clearInterval(self.TimeIntervalID);
			self.TimeIntervalID = setInterval("captureObjSelf.LoopEchoMessage()", 3000);
			return;
		}
		self.ReceivedEchoBack = false;
		clearTimeout(self.TimeOutID);
		if(self.connectState != emConnected)
		{
			clearInterval(self.TimeIntervalID);
			return;
		}
		var obj = new Object();
		obj.command = "echo";
		self.NiuniuSocket.send("1" + encodeURIComponent( $.toJSON(obj)) );
	}

    this.SendReadyRecvData = function()
    {
		self.WriteLog("SendReadyRecvData.");
        var obj = self.NewCaptureParamObject("", 0, 0, 0, 0, 0, 0);
		obj.CmdType = -1;
		self.NiuniuSocket.send("1" + encodeURIComponent( $.toJSON(obj)) );
    }

    this.DoCaptureForCustomize = function(name, hide, AutoCapture, x, y, width, height)
    {
        var obj = self.NewCaptureParamObject(name, hide, AutoCapture, x, y, width, height);
	    try
	    {
    		//启动客户端，或者通过websocket去发送数据
    		if(self.connectState == emConnected)
    		{
				var json = $.toJSON(obj);
    		    self.NiuniuSocket.send('1' + encodeURIComponent(json) );
    		}
		    else
		    {
				//首次启动时，不支持水印，否则会过长
				obj.SetWatermarkPicturePath = "";
				//obj.SetWatermarkTextValue = "";
				var json = $.toJSON(obj);
				self.WriteLog(json.length);
				var newUrl = self.CaptureName + "://" + encodeURIComponent(json);
				self.WriteLog(newUrl.length);

		        //启动客户端
				$('#startCaptureFrame').attr('src', newUrl);

		        self.IsWaitCustomizedCallBack = true;
				self.connectHost();
				return emCaptureUnknown;
		    }

	        return emCaptureSuccess;
	    }
	    catch(e)
	    {
    		alert(e.message);
	    }
	    return emCaptureUnknown;
    }

    this.IsNeedCustomizedProtocol = function()
    {
		if(isMacintosh())
		{
			return true;
		}
        if(!self.useCustomizedProtoco)
        {
            return false;
        }

        if(self.pluginValid())
        {
            return false;
        }

        try
        {
            var agent = window.navigator.userAgent.toLowerCase();
            var isQQBrowser = agent.indexOf("qqbrowser") != -1;
            //if(isQQBrowser)
            //{
            //    return false;
            //}
			var isUBrowser = agent.indexOf("ubrowser") != -1;
			if(isUBrowser)
            {
                return false;
            }
            var isChrome = agent.indexOf("chrome") != -1;
            if(isChrome)
            {
                if(chrome&&chrome.runtime)
                {
                    return true;
                }
            }
            //如果是firefox 且在50版本以上，则需要
            var brow=$.browser;
            if(brow.mozilla)
            {
                return true;
            }
			var isEdge = agent.indexOf("edge") != -1;
			if(isEdge)
            {
                return true;
            }
            return false;
        }
        catch(e)
        {
        }
        return false;
    }

	this.GetVersion = function()
	{
        if(self.IsNeedCustomizedProtocol())
        {
			if(self.connectState != emConnected)
			{
				return;
			}
			var obj = new Object();
			obj.command = "version";
			self.NiuniuSocket.send("1" + encodeURIComponent( $.toJSON(obj)) );
			return;
        }

        if(!self.pluginValid())
        {
            return;
        }
        var verSion = self.niuniuCapture().GetVersion();
		self.VersionCallback(verSion);
		self.WriteLog(verSion);
	}
}

　　capturewrapper.js

　　

var savedPictureContent = '';
var extendName = '';
var captureObj = null;
var downloadUrl = 'http://www.ggniu.cn/download/CaptureInstall.exe';

/*
用于初始化牛牛截图控件，此函数需要在页面加载完成后立即调用
在此函数中，您可以设置相关的截图的UI控制，如，画笔大小、边框颜色等等 【这部分信息在niuniucapture.js中也有默认值，直接修改默认值也可 】
*/
function Init()
{
	if(isMacintosh())
	{
		downloadUrl = 'http://www.ggniu.cn/download/CaptureInstall.dmg';
	}
	captureObj = new NiuniuCaptureObject();
	captureObj.NiuniuAuthKey = "niuniu";
	//此处可以设置相关参数
	captureObj.TrackColor = rgb2value(255, 0, 0);
	captureObj.EditBorderColor = rgb2value(0, 0, 255);

	//设置工具栏的TOOLTIP
	//captureObj.ToolTipText = "tipRectangle|tipCircle|tipArrow|tipBrush|tipGlitter|tipMosaic|tipText|tipUndo|tipSave|tipCancel|tipFinish|Finish";

	//设置控件加载完成以及截图完成的回调函数
	captureObj.FinishedCallback = OnCaptureFinishedCallback;
	captureObj.PluginLoadedCallback = PluginLoadedCallback;
	captureObj.VersionCallback = VersionCallback;

	//初始化控件
	captureObj.InitNiuniuCapture();
}

//用于返回控件的版本号
function VersionCallback(ver)
{
	//captureObj.Version;
	//可以在此根据最新的版本号与控件返回的版本号对比，决定是否要提示升级
	//alert(ver);
}
/*
当控件成功加载后回调的的函数，您可以在此控制相应的UI显示
*/
function PluginLoadedCallback(success)
{
	if(success)
	{
		$('#info').html('');
		$('#imgshow').hide();
		$('#imgshow').attr('src', "./image/loading.gif?v=1");
		$('#btnReload').hide();
		$('#btnCapture').show();
	}
}

//根据是否是Chrome新版本来控制下载不同的控件安装包
function ShowDownLoad()
{
	$('#info').html('如果超过5秒无响应，请点此<a target="_blank" href="' + downloadUrl + '" + date.getMinutes() + date.getSeconds()">安装</a>');
}

/*
当提示安装控件后，需要重新加载控件来使用截图；
也有部分是需要刷新浏览器的
*/
function ReloadPlugin()
{
	captureObj.LoadPlugin();
	$('#btnReload').hide();
	$('#btnCapture').show();
	if(captureObj.pluginValid())
	{
		$('#downloadNotice').hide();
		$('#info').html("截图控件已经安装完毕，您可以进行截图了。");
	}
	else
	{
		var browserInfo = "查看控件是否被浏览器阻止，或通过浏览器设置中的加载项查看NiuniuCapture是否加载并正常运行";
		$('#info').html('截图控件未能识别到，请按如下步骤检查:<br/>1. 确定您已经下载控件安装包并正常安装 <br/>2. ' + browserInfo
			+ '<br/>3. 刷新页面或重新启动浏览器试下<br/>4. 如果仍旧不能截图，出大招吧：'
			+ '<a target="_blank" style="color:#ff0000;" class="btn" href="http://shang.qq.com/wpa/qunwpa?idkey=a9dab7a14df03d19a2833e6b5f17a33639027d06213cf61bdb7554b04492b6e5">一键加群求助</a>');
	}
}

/*
截图入口函数，用于控制UI标签的显示
*/
function StartCapture()
{

	$('#imgshow').hide();
	$('#imgshow').attr('src', "./image/loading.gif?v=1");
	var captureRet = Capture();
	//从返回值来解析显示
	if(captureRet == emCaptureFailed)
	{
		ShowDownLoad();
	}
	else if(captureRet == emCaptureUnknown){
		$('#info').html('正在截图中, 如果超过5秒无响应，请点此<a target="_blank" href="' + downloadUrl + '" + date.getMinutes() + date.getSeconds()">安装</a>');
	}
}

/*
此函数是根据在测试页面上的不同选项来进行截图，在实际应用中，您只需要根据您实际需要的截图模式，传入相应的参数即可
*/
function Capture()
{
	var defaultName = "1.jpg"; //此处为了防止上传的数据过大，建议使用JPG格式
	var hideFlag = $("#hideCurrent").attr("checked")=="checked" ? 1 : 0;
	var autoFlag = $("#captureselectSize").attr("checked")=="checked" ? 1 : 0;
	var captureRet = true;
	if(autoFlag == 0)
	{
		return captureObj.DoCapture("1.jpg", hideFlag, 0, 0, 0, 0, 0);
	}
	else
	{
		autoFlag = $('#getimagefromclipboard').is(':checked') ? 4 : 1;
		if(autoFlag == 4)
		{
			return captureObj.DoCapture("", 0, 4, 0, 0, 0, 0);
		}
		autoFlag = $('#showprewindow').is(':checked') ? 3 : 1;
		if(autoFlag == 3)
		{
			//此时如果x, y, width, height全为0，则表示预截图窗口点击“开始截图”时，手工先把区域
			//x, y, width, height全为1，则表示预截图窗口点击“开始截图”时，自动截取整个桌面
			//其他情况，则自动截取 x, y, width, height 指定的区域
			return captureObj.DoCapture("1.jpg", hideFlag, 3, 0, 0, 0, 0);
		}
		autoFlag = $('#fullscreen').is(':checked') ? 2 : 1;
		if(autoFlag == 2)
		{
			return captureObj.DoCapture("1.jpg", hideFlag, 2, 0, 0, 0, 0);
		}
		else
		{
			return captureObj.DoCapture("1.jpg", hideFlag, 1, $('#xpos').val(), $('#ypos').val(), $('#width').val(), $('#height').val());
		}
	}
}

/*
此处是截图后的回调函数，用于将截图的详细信息反馈回来，你需要调整此函数，完成图像数据的传输与显示
*/
function OnCaptureFinishedCallback(type, x, y, width, height, info, content,localpath)
{
	if(type < 0)
	{
		//需要重新安装控件
		ShowDownLoad();
		return;
	}
	$('#show').hide();
	switch(type)
	{
		case 1:
		{
			$('#info').html('截图完成： x:' + x + ',y:' + y + ',widht:' + width + ',height:' + height);
			UploadCaptureData(content, localpath);
			break;
		}
		case 2:
		{
			$('#info').html('您取消了截图');
			break;
		}
		case 3:
		{
			$('#info').html('您保存了截图到本地： x:' + x + ',y:' + y + ',widht:' + width + ',height:' + height);
			UploadCaptureData(content, localpath);
			break;
		}
		case 4:
		{
			if(info =='0')
			{
				$('#info').html('从剪贴板获取到了截图： ' + localpath);
				UploadCaptureData(content, localpath);
			}
			else
			{
				$('#info').html('从剪贴板获取图片失败。');
			}
			break;
		}
	}
}

//控制上传
function UploadCaptureData(content, localpath)
{
	savedPictureContent = content;

	//获取图片的扩展名
	var pos = localpath.lastIndexOf('.');
	extendName = localpath.substr(pos + 1);

	$('#show').html('截图已经完成，请点击');
	$('#show').show();
	var autoUpload = $("#autoupload").attr("checked")=="checked" ? 1 : 0;
	if(autoUpload)
	{
		UploadData();
	}
	else
	{
		$('#btnUpload').show();
	}
}

/*
实际上传图像数据的函数，此处主要是将BASE64的图像数据，通过AJAX的方式POST到服务器保存成文件，并且显示在页面上
*/
function UploadData()
{
	$('#show').html('截图完成，正在上传，请稍后...');
	$('#btnUpload').hide();
	//上传的数据除了图片外，还可以包含自己需要传递的参数
	var data = "userid=test111&extendname=" + extendName + "&picdata=" + encodeURIComponent(savedPictureContent);

	$.ajax({
		type: "POST",
		url: "./upload.ashx",
		dataType: "json",
		data: data,
		success: function (obj) {
			if(obj.code==0)
			{
				$('#show').html('上传成功，图片地址：' + obj.info);
				$('#imgshow').show();
				$('#imgshow').attr('src', obj.info);
			}
			else
			{
				$('#show').html('上传失败 :' + obj.info);
			}
		},
		error : function(){$('#show').html('由于网络原因，上传失败。'); }
	});
}

function TestSetWatermarkPicture()
{
	captureObj.SetWatermarkPicture("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");
}

　　jquery.josn.js

(function($){var escapeable=/["\\\x00-\x1f\x7f-\x9f]/g,meta={'\b':'\\b','\t':'\\t','\n':'\\n','\f':'\\f','\r':'\\r','"':'\\"','\\':'\\\\'};$.toJSON=typeof JSON==='object'&&JSON.stringify?JSON.stringify:function(o){if(o===null){return'null';}
var type=typeof o;if(type==='undefined'){return undefined;}
if(type==='number'||type==='boolean'){return''+o;}
if(type==='string'){return $.quoteString(o);}
if(type==='object'){if(typeof o.toJSON==='function'){return $.toJSON(o.toJSON());}
if(o.constructor===Date){var month=o.getUTCMonth()+1,day=o.getUTCDate(),year=o.getUTCFullYear(),hours=o.getUTCHours(),minutes=o.getUTCMinutes(),seconds=o.getUTCSeconds(),milli=o.getUTCMilliseconds();if(month<10){month='0'+month;}
if(day<10){day='0'+day;}
if(hours<10){hours='0'+hours;}
if(minutes<10){minutes='0'+minutes;}
if(seconds<10){seconds='0'+seconds;}
if(milli<100){milli='0'+milli;}
if(milli<10){milli='0'+milli;}
return'"'+year+'-'+month+'-'+day+'T'+
hours+':'+minutes+':'+seconds+'.'+milli+'Z"';}
if(o.constructor===Array){var ret=[];for(var i=0;i<o.length;i++){ret.push($.toJSON(o[i])||'null');}
return'['+ret.join(',')+']';}
var name,val,pairs=[];for(var k in o){type=typeof k;if(type==='number'){name='"'+k+'"';}else if(type==='string'){name=$.quoteString(k);}else{continue;}
type=typeof o[k];if(type==='function'||type==='undefined'){continue;}
val=$.toJSON(o[k]);pairs.push(name+':'+val);}
return'{'+pairs.join(',')+'}';}};$.evalJSON=typeof JSON==='object'&&JSON.parse?JSON.parse:function(src){return eval('('+src+')');};$.secureEvalJSON=typeof JSON==='object'&&JSON.parse?JSON.parse:function(src){var filtered=src.replace(/\\["\\\/bfnrtu]/g,'@').replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,']').replace(/(?:^|:|,)(?:\s*\[)+/g,'');if(/^[\],:{}\s]*$/.test(filtered)){return eval('('+src+')');}else{throw new SyntaxError('Error parsing JSON, source is not valid.');}};$.quoteString=function(string){if(string.match(escapeable)){return'"'+string.replace(escapeable,function(a){var c=meta[a];if(typeof c==='string'){return c;}
c=a.charCodeAt();return'\\u00'+Math.floor(c/16).toString(16)+(c%16).toString(16);})+'"';}
return'"'+string+'"';};})(jQuery);

　　

在页面执行下就ok了，

<script>
        Init()
 </script>