JS生成一维码(条形码)功能示例

本文实例讲述了JS生成一维码(条形码)功能的方法。分享给大家供大家参考，具体如下：

1、js代码：

(function() {
if (!exports) var exports = window;
var BARS    = [212222,222122,222221,121223,121322,131222,122213,122312,132212,221213,221312,231212,112232,122132,122231,113222,123122,123221,223211,221132,221231,213212,223112,312131,311222,321122,321221,312212,322112,322211,212123,212321,232121,111323,131123,131321,112313,132113,132311,211313,231113,231311,112133,112331,132131,113123,113321,133121,313121,211331,231131,213113,213311,213131,311123,311321,331121,312113,312311,332111,314111,221411,431111,111224,111422,121124,121421,141122,141221,112214,112412,122114,122411,142112,142211,241211,221114,413111,241112,134111,111242,121142,121241,114212,124112,124211,411212,421112,421211,212141,214121,412121,111143,111341,131141,114113,114311,411113,411311,113141,114131,311141,411131,211412,211214,211232,23311120]
 , START_BASE = 38
 , STOP    = 106 ;
function code128(code, barcodeType) {
 if (arguments.length<2)
    barcodeType = code128Detect(code);
 if (barcodeType=='C' && code.length％2==1)
   code = '0'+code;
 var a = parseBarcode(code, barcodeType);
 return bar2html(a.join('')) + '<label>' + code + '</label>';
}
function bar2html(s) {
 for(var pos=0, sb=[]; pos<s.length; pos+=2) {
  sb.push('<div class="bar' + s.charAt(pos) + ' space' + s.charAt(pos+1) + '"></div>');
 }
 return sb.join('');
}
function code128Detect(code) {
 if (/^[0-9]+$/.test(code)) return 'C';
 if (/[a-z]/.test(code)) return 'B';
 return 'A';
}
function parseBarcode(barcode, barcodeType) {
 var bars = [];
 bars.add = function(nr) {
  var nrCode = BARS[nr];
  this.check = this.length==0 ? nr : this.check + nr*this.length;
  this.push( nrCode || ("UNDEFINED: "+nr+"->"+nrCode) );
 };
 bars.add(START_BASE + barcodeType.charCodeAt(0));
 for(var i=0; i<barcode.length; i++) {
  var code = barcodeType=='C' ? +barcode.substr(i++, 2) : barcode.charCodeAt(i);
  converted = fromType[barcodeType](code);
  if (isNaN(converted) || converted<0 || converted>106) throw new Error("Unrecognized character ("+code+") at position "+i+" in code '"+barcode+"'.");
  bars.add( converted );
 }
 bars.push(BARS[bars.check ％ 103], BARS[STOP]);
 return bars;
}
var fromType = {
 A: function(charCode) {
  if (charCode>=0 && charCode<32) return charCode+64;
  if (charCode>=32 && charCode<96) return charCode-32;
  return charCode;
 },
 B: function(charCode) {
  if (charCode>=32 && charCode<128) return charCode-32;
  return charCode;
 },
 C: function(charCode) {
  return charCode;
 }
};
//--| Export
exports.code128 = code128;
})();
/*
 showDiv：代表需要显示的divID，
 textVlaue ： 代表需要生成的值，
 barcodeType：代表生成类型(A、B、C)三种类型
*/
function createBarcode(showDiv,textValue,barcodeType){
 var divElement = document.getElementById(showDiv);
   divElement.innerHTML = code128(textValue,barcodeType);
}

2.css代码如下：

.barcode {
float:left;
clear:both;
padding: 0 10px; /*quiet zone*/
overflow:auto;
height:0.5in; /*size*/
}
.right { float:right; }
.barcode + * { clear:both; }
.barcode div {
float:left;
height: 0.35in; /*size*/
}
.barcode .bar1 { border-left:1px solid black; }
.barcode .bar2 { border-left:2px solid black; }
.barcode .bar3 { border-left:3px solid black; }
.barcode .bar4 { border-left:4px solid black; }
.barcode .space0 { margin-right:0 }
.barcode .space1 { margin-right:1px }
.barcode .space2 { margin-right:2px }
.barcode .space3 { margin-right:3px }
.barcode .space4 { margin-right:4px }
.barcode label {
clear:both;
display:block;
text-align:center;
font: 0.125in/100％ helvetica; /*size*/
}
/*** bigger ******************************************/
.barcode2 {
float:left;
clear:both;
padding: 0 10px; /*quiet zone*/
overflow:auto;
height:1in; /*size*/
}
.barcode2 + * { clear:both; }
.barcode2 div {
float:left;
height: 0.7in; /*size*/
}
.barcode2 .bar1 { border-left:2px solid black; }
.barcode2 .bar2 { border-left:4px solid black; }
.barcode2 .bar3 { border-left:6px solid black; }
.barcode2 .bar4 { border-left:8px solid black; }
.barcode2 .space0 { margin-right:0 }
.barcode2 .space1 { margin-right:2px }
.barcode2 .space2 { margin-right:4px }
.barcode2 .space3 { margin-right:6px }
.barcode2 .space4 { margin-right:8px }
.barcode2 label {
clear:both;
display:block;
text-align:center;
font: 0.250in/100％ helvetica; /*size*/
}

3.html代码如下：

<html>
<head>
 <title>QR-Code Clock</title>
 <link rel="stylesheet" href="code128.css" type="text/css" media="screen" charset="utf-8">
 <script src="code128.js" type="text/javascript" charset="utf-8"></script>
   <script type="text/javascript">
(function(divId) {
var divElement ,oldOnLoad = window.onload ;
function getTimeString() {
 var pad = function(n) { return n < 10 ? '0' + n.toString(10) : n.toString(10); }
   ,dt = new Date();
 return [pad(dt.getHours()), pad(dt.getMinutes()), pad(dt.getSeconds())].join(':');
}
function UpdateClock() {
 var timeText = getTimeString();
 divElement.innerHTML = code128(timeText);
}
window.onload = function() {
 divElement = document.getElementById(divId);
 UpdateClock();
 setInterval(UpdateClock, 1000);
 if (typeof oldOnLoad == 'function') oldOnLoad.apply(this, arguments);
}
})('div1');
 </script>
</head>
<body>
 <input type="button" value ="生成" onclick="createBarcode('div128','12345678','B');"/>
  <div class="barcode2" id="div128"></div>
  <div class="barcode2" id="div1"></div>
</body>
</html>

运行效果图如下：

希望本文所述对大家JavaScript程序设计有所帮助。