简单的需求如下：
download/目录下有一个文件： query.list，这个文件记录了爬取的文件列表【格式如下】，我想读取列表信息、以及文件内容，并渲染页面。
  
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查询生成 1 个文档, 有<a href="docs/" class="docs-link">1个文书</a>可以查看
{"title": "上海XX贸易有限公司与XXX劳动合同纠纷", "court": "上海市第二中级人民法院", "caseno": "（2015）沪二中民三（民）终字第XXX号", "date": "2015-11-25", "filename": "./download/1.txt", "docid": "1"}
  
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var fs = require('fs');
  
async function read_file(filename) {
     return new Promise(function(resolve, reject) {
        fs.readFile(filename, 'utf8', function(error, data) {
            if (error) return reject(error);
            resolve(data);
        });
     });
};
  
async function htmlize(fulltext) {
     return new Promise(function(resolve, reject) {
  
         ...   // 将文本文件html化，便于显示
         console.log(inner_html);
         resolve(inner_html);
     });
};
  
var asyn_func = async function() {
     data = await read_file('./download/query.list');
  
     lines = data.split("\n");
  
     file_list = []
     for (var i = 1; i < lines.length; ++i) {
         if (lines[i] == '') {
             continue;
         }
         obj = JSON.parse(lines[i]);
         console.log(obj);
         file_list.push(obj['filename']);
     }
  
     return file_list.map(async (filename) => {
         var data = await read_file(filename);
         var html = await htmlize(data);                            /// ！！！！ 这里会卡住
         return html;
     });
  
}
  
asyn_func().then(v => Promise.all(v)).then(function(result) {
     console.log(result);
}).catch(function(err) {
     console.log(err);
});
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