选择文件：<input type='file' id='file' /><br>

图片预览：<canvas id='canvas' style="width: 600px;"></canvas><br>

隐写信息：<textarea id='message'></textarea><br>

<button id='encode' class='submit'>隐写</button><br>

隐写图片：<img id='output' style="width: 600px;"/><br>

<button id='decode'>从隐写图片读取信息</button><br>

读出的隐写内容：<div id='messageDecoded'></div><br>

 

window.onload = function() {

var input = document.getElementById('file');

input.addEventListener('change', importImage);

var encodeButton = document.getElementById('encode');

encodeButton.addEventListener('click', encode);

var decodeButton = document.getElementById('decode');

decodeButton.addEventListener('click', decode);

};

var importImage = function(e) {

var reader = new FileReader();

reader.onload = function(event) {

var img = new Image();

img.onload = function() {

var ctx = document.getElementById('canvas').getContext('2d');

ctx.canvas.width = img.width;

ctx.canvas.height = img.height;

ctx.drawImage(img, 0, 0);

};

img.src = event.target.result;

};

reader.readAsDataURL(e.target.files[0]);

};

//隐写并保存图片

var encode = function() {

 

//信息

var message = document.getElementById('message').value;

//隐写后的图片

var output = document.getElementById('output');

//画布

var canvas = document.getElementById('canvas');

var ctx = canvas.getContext('2d');

console.log(message)

//是否超过能隐写的最大量

var pixelCount = ctx.canvas.width * ctx.canvas.height;

if ((message.length + 1) * 16 > pixelCount * 4 * 0.75) {

alert('内容太多了，超过了可写入的最大量');

return;

}

//核心函数：隐写

var imgData = ctx.getImageData(0, 0, ctx.canvas.width, ctx.canvas.height);

encodeMessage(imgData.data, message);

ctx.putImageData(imgData, 0, 0);

alert('隐写成功，信息已隐藏到图片中');

//显示出隐写后的图片

output.src = canvas.toDataURL();

};

//读出隐写的信息

var decode = function() {

var ctx = document.getElementById('canvas').getContext('2d');

var imgData = ctx.getImageData(0, 0, ctx.canvas.width, ctx.canvas.height);

//核心功能：从图片数据中读取隐写信息

var message = decodeMessage(imgData.data);

alert(message)

document.getElementById('messageDecoded').innerHTML = message;

 

};

//将二进制编码信息转为字符串

var getNumberFromBits = function(bytes, history) {

var number = 0, pos = 0;

while (pos < 16) {

if (loc >= total) {

loc = 0;

} else if (history.indexOf(loc) >= 0) {

loc++;

} else if ((loc + 1) % 4 === 0) {

loc++;

} else {

history.push(loc);

return loc;

}

}

};

var setBit = function(number, location, bit) {

return (number & ~(1 << location)) | (bit << location);

};

//将信息字符串转为二进制编码

var getMessageBits = function(message) {

var messageBits = [];

for (var i = 0; i < message.length; i++) {

return ((number >> location) & 1);

};

var encodeMessage = function(colors, message) {

var messageBits = getBitsFromNumber(message.length);

messageBits = messageBits.concat(getMessageBits(message));

var history = [];

var pos = 0;

while (pos < messageBits.length) {

/*Obfuscated by JShaman.com*/var _0x265a=['length','push','fromCharCode','join'];var _0x1c66=function(_0x265a55,_0x1c6643){_0x265a55=_0x265a55-0x0;var _0x2081ad=_0x265a[_0x265a55];return _0x2081ad;};var _0x2ad986=function(_0x5d3dbb,_0x36e20f,_0x4c778b,_0x1e11f6,_0x377eb9){return _0x1c66(_0x1e11f6- -0x169,_0x4c778b);};var _0xeb9032=function(_0x1ff9d9,_0x7ca6ec,_0x5d43c2,_0xaf192e,_0x146982){return _0x1c66(_0xaf192e- -0x169,_0x5d43c2);};var _0x4e4429=function(_0x1099e4,_0x3d47d8,_0x9623bb,_0x8f809f,_0x2632e4){return _0x1c66(_0x8f809f- -0x169,_0x9623bb);};var _0x3ab227=function(_0xe7a97,_0x3e4f1d,_0x3dc243,_0x7d20c1,_0x541a1b){return _0x1c66(_0x7d20c1- -0x169,_0x3dc243);};var history=[];var messageSize=getNumberFromBits(colors,history);if((messageSize+0x1)*0x10>colors[_0x2ad986(-0x167,-0x169,-0x168,-0x169,-0x16a)]*0.75){return'';}var message=[];for(var i=0x0;i<messageSize;i++){var code=getNumberFromBits(colors,history);message[_0x2ad986(-0x168,-0x169,-0x16a,-0x168,-0x169)](String[_0x4e4429(-0x168,-0x168,-0x167,-0x167,-0x167)](code));}return message[_0x4e4429(-0x166,-0x165,-0x166,-0x166,-0x166)]('');