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一、简介

 

Barcode模块管理条码扫描,提供常见的条码(二维码及一维码)的扫描识别功能,可调用设备的摄像头对条码图片扫描进行数据输入。通过plus.barcode可获取条码码管理对象。

二、实现的效果

三、实现 代码

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<!doctype html> 

<html> 

   <head> 

    <meta charset="UTF-8"> 

    <title></title> 

    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" /> 

    <link href="css/mui.min.css" rel="stylesheet" /> 

    <script src="js/mui.min.js"></script> 

    <style type="text/css"> 

        #bcid{ 

            width: 100%; 

            height: 100%; 

            position: absolute; 

            background: #000000; 

        } 

        html, body ,p{ 

            height:100%; 

            width: 100%; 

        } 

        .fbt{ 

            color: #0E76E1; 

            width: 50%; 

            background-color: #ffffff; 

            float: left;  

            line-height: 44px; 

            text-align: center; 

        } 

    </style> 

   </head> 

  <body> 

    <header class="mui-bar mui-bar-nav" style="background-color: #ffffff;"> 

      <a class="mui-action-back mui-icon mui-icon-left-nav mui-pull-left"></a> 

      <h1 class="mui-title" style="color: #0E76E1;">物品二维码扫描</h1> 

      <span class="mui-icon mui-icon-spinner-cycle mui-spin mui-pull-right" id="turnTheLight"></span> 

    </header> 

    <p id="bcid">    

         <!--盛放扫描控件的p-->         

    </p> 

    <p class="mui-bar mui-bar-footer" style="padding: 0px;"> 

        <p class="fbt" onclick="scanPicture();">从相册选择二维码</p> 

        <p class="fbt mui-action-back">取  消</p> 

    </p> 

    <script type="text/javascript"> 

           scan = null;//扫描对象 

        mui.plusReady(function () { 

              mui.init(); 

          startRecognize(); 

           }); 

        function startRecognize(){ 

           try{ 

              var filter; 

             //自定义的扫描控件样式 

             var styles = {frameColor: "#29E52C",scanbarColor: "#29E52C",background: ""} 

            //扫描控件构造 

            scan = new plus.barcode.Barcode('bcid',filter,styles); 

            scan.onmarked = onmarked;  

            scan.onerror = onerror; 

            scan.start(); 

            //打开关闭闪光灯处理 

            var flag = false; 

            document.getElementById("turnTheLight").addEventListener('tap',function(){ 

               if(flag == false){ 

                  scan.setFlash(true); 

                  flag = true; 

               }else{ 

                 scan.setFlash(false); 

                 flag = false; 

               } 

            }); 

          }catch(e){ 

            alert("出现错误啦:\n"+e); 

             } 

          }; 

            function onerror(e){ 

                    alert(e); 

            }; 

            function onmarked( type, result ) { 

                    var text = ''; 

                    switch(type){ 

                        case plus.barcode.QR: 

                        text = 'QR: '; 

                        break; 

                        case plus.barcode.EAN13: 

                        text = 'EAN13: '; 

                        break; 

                        case plus.barcode.EAN8: 

                        text = 'EAN8: '; 

                        break; 

                    } 

                    alert( text + " : "+ result ); 

            };   

        // 从相册中选择二维码图片  

        function scanPicture() { 

            plus.gallery.pick(function(path){ 

                plus.barcode.scan(path,onmarked,function(error){ 

                    plus.nativeUI.alert( "无法识别此图片" ); 

                }); 

            },function(err){ 

                plus.nativeUI.alert("Failed: "+err.message); 

            }); 

        }        

        </script> 

    </body> 

</html>

三、做的过程中遇见的问题

a,p占满整个页面

1,此p宽高都为100%,父级元素的高度也为此(依次类推直至根节点),或者此p的position为absolute;

2,可采用js动态设置页面宽高

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var height = window.innerHeight + 'px';//获取页面实际高度 

var width = window.innerWidth + 'px'; 

document.getElementById("bcid").style.height= height; 

document.getElementById("bcid").style.width= width;

b,扫描控件有上下边距

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