前端生成条形码

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：

更多关于JavaScript相关内容可查看本站专题：《javascript编码操作技巧总结》、《JavaScript加密解密技巧汇总》、《JavaScript查找算法技巧总结》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》

希望本文所述对大家JavaScript程序设计有所帮助。

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