// 1) 我们希望 读取数据 node 异步 会等待同步代码都执行完成后在执行
const fs = require('fs');
let school = {}
// 并发的问题 如何解决 计数器
const after = (times, fn) =>()=> --times === 0 && fn();
let newAfter = after(2, () => {
console.log(school);
});
fs.readFile('name.txt','utf8',(err,data)=>{
school['name'] = data;
newAfter();
});
fs.readFile('age.txt','utf8',(err,data)=>{
school['age'] = data;
newAfter();
}); √为了以后不被突如其来的困难逼迫到走投无路，为了未来能开开心心的自由自在不四分五裂地生活，我要赚钱！赚很多钱！其他...
vim /etc/sudoersroot ALL=(ALL) ALL用户名 ALL=(ALL) ALL
/etc/sudoers root,.ALL=(ALL) NOPASSWD: ALL %admin ALL=(AL...
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