1 (function(win, undefined) {  2 var SELECTORS = transformSelector;  3   4 function insertTemplate(callback) {  5   getTemplate('views/price-alert-messager.html', function(template) {  6     $(document.body).append(template).attr('data-ruyitao-price-mind-inserted', 1)  7     callback && callback()  8   })  9 } 10  11 function getItemTemplate(item) { 12   var currentPrice = parseFloat(item.original_price) - parseFloat(item.reduction_price) 13   var html = '
' 14   html += '
      
       
      
' 15   html += '
      
       ' 16   html += '
       
        ' + item.title + '
       
' 17   html += '
       
        已经降到了' 18   html += '
        ￥' + currentPrice.toFixed(2) + '
       
' 19   html += '
       
        降了￥' + item.reduction_price + '
       
      
' 20   return html 21 } 22  23 function bindEvents() { 24   $('#' + SELECTORS('pamb-messages')).delegate('.' + SELECTORS('pamb-message') , 'click', function() { 25     var itemId = $(this).attr('data-id') 26     var url = 'http://ruyi.taobao.com/item/' + encodeURIComponent(itemId) + '?utm_medium=ext&utm_source=ruyi' 27     openTab(url, true) 28   }) 29  30   $('#' + SELECTORS('pamb-close')).click(function() { 31     hide() 32   }) 33 } 34  35 function show() { 36   var $wrapper = $('#' + SELECTORS('pamb-wrapper')) 37   $wrapper.css('bottom', 0) 38 } 39  40 function hide() { 41   var $wrapper = $('#' + SELECTORS('pamb-wrapper')) 42   var outerHeight = $wrapper.outerHeight() 43   $wrapper.css('bottom', -outerHeight + 'px') 44 } 45  46 function clearUnreadPriceMindMessages() { 47   chrome.runtime.sendMessage({ 48     topic: 'clear_unread_price_mind_messages' 49   }) 50 } 51  52 function render(messages) { 53   if (messages && messages.length > 0) { 54     var templateInserted = $(document.body).attr('data-ruyitao-price-mind-inserted') == 1 55     if (templateInserted) { 56       callback() 57     } else { 58       insertTemplate(callback) 59     } 60   } 61  62   function callback() { 63     var html = '' 64     var i = 0 65     var len = messages.length 66     len = len < 3 ? len : 3 67     for (; i < len; i++) { 68       html += getItemTemplate(messages[i]) 69     } 70  71     $('#' + SELECTORS('pamb-messages')).html(html) 72     !templateInserted && bindEvents() 73     show() 74     clearUnreadPriceMindMessages() 75   } 76 } 77  78 function replaceTemplateSelectors(html) { 79   return html.replace(/ruyitao-selector-prefix-([\w_-]+)/g, function() { 80     return transformSelector(arguments[1]); 81   }); 82 } 83  84 function getTemplate(pageName, callback) { 85   var self = this; 86   chrome.runtime.sendMessage({ 87     topic: "get_template", 88     page: pageName 89   }, function (res) { 90     var template = replaceTemplateSelectors(res.template); 91     sanitizeHTML(template, function(sanitizedTemplate) { 92       callback(sanitizedTemplate); 93     }) 94   }); 95 } 96  97 function sanitizeHTML (htmlString, callback) { 98   var rScript = /
     
      <\/script\s*>/g; 99   var rOnEvent = /\bon[A-z]+\s*=\s*['"]?[^>"]+['"]?/g;100   var rHref = /href\s*=\s*['"]?\s*javascript:/g;101   var result = htmlString.replace(rScript, '').replace(rOnEvent, ' ').replace(rHref, ' ');102   callback(result)103 }104 105 function openTab(url, select) {106   select = select || false;107   chrome.runtime.sendMessage({108     topic: 'tab_open',109     url: url,110     selected: select111   });112 }113 114 var _selectors = {};115 var _selectors_seen = {};116 function generateRandomString() {117   var rand_str = String.fromCharCode(Math.floor(Math.random() * 25 + 97)) +118     Math.floor(Math.random() * 134217728).toString(36);119   if ( typeof _selectors_seen[rand_str] != "undefined" ) {120     return generateRandomString();121   } else {122     _selectors_seen[rand_str] = true;123     return rand_str;124   }125 }126 127 function transformSelector(selector) {128   // return 'ruyitao-' + selector;129   if ( typeof _selectors[selector] != "undefined" ) {130     return _selectors[selector];131   }132   // @if firefox133   var prefix = 'ryt-';134   // @else135   var prefix = '';136   // @endif137   return _selectors[selector] = prefix + generateRandomString();138 }139 140 chrome.runtime.onMessage.addListener(function(req, sender) {141 Uncaught TypeError: Cannot read property 'onMessage' of undefined142   switch (req.topic) {143   case 'show_price_mind_messages':144     render(req.messages)145     break;146   }147 });148 })(window);
     

　　近来做javascript开发，应该是做javascript平台维护，遇到很多莫名其妙的问题，脚本报错，刚开始以为是浏览器兼容性问题，后来试了很多方法，自身代码没问题，就是找不到原因，利用浏览器自带的调试工具，发现是软件在偷偷的干事情， 以上就是证据。

　　报错内容：Uncaught TypeError: Cannot read property 'onMessage' of undefined

 

 

　　类似的还有金山毒霸在网页中内嵌脚本，嵌入脚本都没关系，你不要导致别人的应用程序报错啊。因为毒霸植入的脚本导致ie浏览器下有兼容性问题而报错，对于开发和客户来说根本不知道是什么原因报错啊。找到原因之后，我亲自联系过毒霸开发人员交流，最后毒霸开发人员更新他们的内库后解决问题。通过此事还认识了一位c++高手，可惜他不懂网页，好几次问我javascript方面的东西，瞬间变成x牛了。

　　以下是毒霸内嵌脚本，留个记号：