node.js 读取文件

var path = require("path");
var fs = require("fs");

//let filePath = path.join(__dirname, "..", "leavemsg");

function run(filePath) {
    let str;
    fs.readFile(filePath,{encoding:"utf-8"}, function (err, fr) {
           //readFile回调函数
           if (err) {
             console.log(err);
            }else {
             str = fr;
            }
        });
    return str;
}

const readFile = require("util").promisify(fs.readFile);

async function run(filePath) {
  try {
      const fr = await readFile(filePath,"utf-8");
      return fr;
   } catch (err) {
      console.log(‘Error‘, err);
   }    
}