解决Hexo+Github+Typora图片无法正确显示的问题

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'use strict';
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var cheerio = require('cheerio');
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// http://stackoverflow.com/questions/14480345/how-to-get-the-nth-occurrence-in-a-string
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function getPosition(str, m, i) {
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  return str.split(m, i).join(m).length;
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}
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var version = String(hexo.version).split('.');
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hexo.extend.filter.register('after_post_render', function(data){
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  var config = hexo.config;
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  if(config.post_asset_folder){
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       var link = data.permalink;
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   if(version.length > 0 && Number(version[0]) == 3)
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      var beginPos = getPosition(link, '/', 1) + 1;
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   else
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      var beginPos = getPosition(link, '/', 3) + 1;
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   // In hexo 3.1.1, the permalink of "about" page is like ".../about/index.html".
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   var endPos = link.lastIndexOf('/') + 1;
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    link = link.substring(beginPos, endPos);
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    var toprocess = ['excerpt', 'more', 'content'];
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    for(var i = 0; i < toprocess.length; i++){
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      var key = toprocess[i];
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      var $ = cheerio.load(data[key], {
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        ignoreWhitespace: false,
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        xmlMode: false,
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        lowerCaseTags: false,
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        decodeEntities: false
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      });
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      $('img').each(function(){
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       if ($(this).attr('src')){
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           // For windows style path, we replace '\' to '/'.
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           var src = $(this).attr('src').replace('\\', '/');
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           if(!/http[s]*.*|\/\/.*/.test(src) &&
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              !/^\s*\//.test(src)) {
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             // For "about" page, the first part of "src" can't be removed.
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             // In addition, to support multi-level local directory.
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             var linkArray = link.split('/').filter(function(elem){
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               return elem != '';
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             });
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             var srcArray = src.split('/').filter(function(elem){
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               return elem != '' && elem != '.';
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             });
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             if(srcArray.length > 1)
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               srcArray.shift();
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             src = srcArray.join('/');
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             $(this).attr('src', config.root + link + src);
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             console.info&&console.info("update link as:-->"+config.root + link + src);
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           }
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       }else{
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           console.info&&console.info("no src attr, skipped...");
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           console.info&&console.info($(this));
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       }
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      });
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      data[key] = $.html();
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    }
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  }
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});