node

#+LATEX_HEADER: \usepackage{ctex}

* 全局对象
- global
:g:
#+BEGIN_SRC javascript
  console.log(global);

  // Object [global] {
  //     global: [Circular],
  //         clearInterval: [Function: clearInterval],
  //     clearTimeout: [Function: clearTimeout],
  //     setInterval: [Function: setInterval],
  //     setTimeout: [Function: setTimeout] { [Symbol(util.promisify.custom)]: [Function] },
  //     queueMicrotask: [Function: queueMicrotask],
  //     clearImmediate: [Function: clearImmediate],
  //     setImmediate: [Function: setImmediate] {
  //         [Symbol(util.promisify.custom)]: [Function]
  //     }
  // }
#+END_SRC
:END:

- console
:g:
#+BEGIN_SRC javascript
  console.log(console)

  // {
  //     log: [Function: bound consoleCall],
  //     warn: [Function: bound consoleCall],
  //     dir: [Function: bound consoleCall],
  //     time: [Function: bound consoleCall],
  //     timeEnd: [Function: bound consoleCall],
  //     timeLog: [Function: bound consoleCall],
  //     trace: [Function: bound consoleCall],
  //     assert: [Function: bound consoleCall],
  //     clear: [Function: bound consoleCall],
  //     count: [Function: bound consoleCall],
  //     countReset: [Function: bound consoleCall],
  //     group: [Function: bound consoleCall],
  //     groupEnd: [Function: bound consoleCall],
  //     table: [Function: bound consoleCall],
  //     debug: [Function: bound consoleCall],
  //     info: [Function: bound consoleCall],
  //     dirxml: [Function: bound consoleCall],
  //     error: [Function: bound consoleCall],
  //     groupCollapsed: [Function: bound consoleCall],
  //     Console: [Function: Console],
  //     profile: [Function: profile],
  //     profileEnd: [Function: profileEnd],
  //     timeStamp: [Function: timeStamp],
  //     context: [Function: context],
  //     [Symbol(kBindStreamsEager)]: [Function: bound ],
  //     [Symbol(kBindStreamsLazy)]: [Function: bound ],
  //     [Symbol(kBindProperties)]: [Function: bound ],
  //     [Symbol(kWriteToConsole)]: [Function: bound ],
  //     [Symbol(kGetInspectOptions)]: [Function: bound ],
  //     [Symbol(kFormatForStdout)]: [Function: bound ],
  //     [Symbol(kFormatForStderr)]: [Function: bound ]
  // }

#+END_SRC
:END:

- exports, require, module, __filename, __dirname（模块参数）
:g:
#+BEGIN_SRC javascript
  console.log(arguments.callee + ‘‘);

  // function (exports, require, module, __filename, __dirname) {
  //     console.log(arguments.callee + ‘‘);
#+END_SRC
:END:
* 代码执行优先级
同步代码优先，例子如下
:g:
#+BEGIN_SRC javascript
  // 代码执行优先级
  setTimeout(function () {
      setTimeout(function () {
      console.log(‘time out‘);
      }, 0);
      new Promise(resolve => {
      setTimeout(function () {
          console.log(‘start in Promise‘);
      }, 1);
      console.log(‘beg‘);
      resolve();
      console.log(‘end‘);
      setTimeout(function () {
          console.log(‘end in Promise‘);
      }, 0);
      }).then(() => {
      console.log(‘finish‘);
      });
      console.log(‘不要调皮‘);
  }, 100);

  // beg
  // end
  // 不要调皮
  // finish
  // time out
  // start in Promise
  // end in Promise
#+END_SRC
:END: