用JS解读二维码

高级JavaScript组件

下载此实例

开发语言：js
实例大小：0.03M
下载次数：10
浏览次数：63
发布时间：2017-05-15
实例类别：高级JavaScript组件
发布人：2363646802
文件格式：.rar
所需积分：4

实例介绍

【实例简介】
【实例截图】 from clipboard

【核心代码】

<html>
<head><meta http-equiv="content-type" content="txt/html;charset=utf-8" />
<title>javascript解码读取二维码信息</title>
<script type="text/javascript" src="grid.js"></script>
<script type="text/javascript" src="version.js"></script>
<script type="text/javascript" src="detector.js"></script>
<script type="text/javascript" src="formatinf.js"></script>
<script type="text/javascript" src="errorlevel.js"></script>
<script type="text/javascript" src="bitmat.js"></script>
<script type="text/javascript" src="datablock.js"></script>
<script type="text/javascript" src="bmparser.js"></script>
<script type="text/javascript" src="datamask.js"></script>
<script type="text/javascript" src="rsdecoder.js"></script>
<script type="text/javascript" src="gf256poly.js"></script>
<script type="text/javascript" src="gf256.js"></script>
<script type="text/javascript" src="decoder.js"></script>
<script type="text/javascript" src="qrcode.js"></script>
<script type="text/javascript" src="findpat.js"></script>
<script type="text/javascript" src="alignpat.js"></script>
<script type="text/javascript" src="databr.js"></script>

<script type="text/javascript">
var gCtx = null;
var gCanvas = null;

var imageData = null;
var ii=0;
var jj=0;
var c=0;

function dragenter(e) { e.stopPropagation(); e.preventDefault(); }
function dragover(e) { e.stopPropagation(); e.preventDefault(); }
function drop(e) { e.stopPropagation(); e.preventDefault(); var dt = e.dataTransfer; var files = dt.files; handleFiles(files); }
function handleFiles(f) {
var o = [];
for (var i = 0; i < f.length; i ) {
var reader = new FileReader();
reader.onload = (function (theFile) {
return function (e) {
qrcode.decode(e.target.result);
};
})(f[i]);
// Read in the image file as a data URL.
reader.readAsDataURL(f[i]);
}
}
function load() {
initCanvas(640, 480);
qrcode.success = function (d) { alert('javascript读出的二维码信息为：' utf8ToUtf16(d)) };
qrcode.error = function (d) { alert('读取二维码信息错误：' utf8ToUtf16(d)) };
qrcode.callback = function (d, status) { alert('读取二维码信息' (status == 1 ? '成功' : '失败') '：' utf8ToUtf16(d)); };
qrcode.decode("meqrthumb.png");
}

function initCanvas(ww, hh) {
gCanvas = document.getElementById("qr-canvas");
gCanvas.addEventListener("dragenter", dragenter, false);
gCanvas.addEventListener("dragover", dragover, false);
gCanvas.addEventListener("drop", drop, false);
var w = ww;
var h = hh;
gCanvas.style.width = w "px";
gCanvas.style.height = h "px";
gCanvas.width = w;
gCanvas.height = h;
gCtx = gCanvas.getContext("2d");
gCtx.clearRect(0, 0, w, h);
imageData = gCtx.getImageData(0, 0, 320, 240);
}

function utf8ToUtf16(s) {//将utf-8字符串转码为unicode字符串，要不读取的二维码信息包含中文会乱码
if (!s) {
return;
}

var i, codes, bytes, ret = [], len = s.length;
for (i = 0; i < len; i ) {
codes = [];
codes.push(s.charCodeAt(i));
if (((codes[0] >> 7) & 0xff) == 0x0) {
//单字节 0xxxxxxx
ret.push(s.charAt(i));
} else if (((codes[0] >> 5) & 0xff) == 0x6) {
//双字节 110xxxxx 10xxxxxx
codes.push(s.charCodeAt( i));
bytes = [];
bytes.push(codes[0] & 0x1f);
bytes.push(codes[1] & 0x3f);
ret.push(String.fromCharCode((bytes[0] << 6) | bytes[1]));
} else if (((codes[0] >> 4) & 0xff) == 0xe) {
//三字节 1110xxxx 10xxxxxx 10xxxxxx
codes.push(s.charCodeAt( i));
codes.push(s.charCodeAt( i));
bytes = [];
bytes.push((codes[0] << 4) | ((codes[1] >> 2) & 0xf));
bytes.push(((codes[1] & 0x3) << 6) | (codes[2] & 0x3f));
ret.push(String.fromCharCode((bytes[0] << 8) | bytes[1]));
}
}
return ret.join('');
}
</script>
</head>
<body onload="load()">
将二维码图片拖放到下面的黑色框框内解码获取信息<br />
<canvas id="qr-canvas" width="640" height="480" style="border:solid 1px #000"></canvas>
</body>
</html>

标签： 二维码 js s

实例下载地址