JavaScript 异步编程执行顺序示例 - console.log, async/await, setTimeout, Promise

console.log('script\u0020start')\nasync\u0020function\u0020async1()\u0020{\n\u0020\u0020await\u0020async2()\n\u0020\u0020console.log('async1\u0020end')\n}\nasync\u0020function\u0020async2()\u0020{\n\u0020\u0020console.log('async2\u0020end')\n}\nasync1()\n\nsetTimeout(function()\u0020{\n\u0020\u0020console.log('setTimeout')\n},\u00200)\n\nnew\u0020Promise(resolve\u0020=>\u0020{\n\u0020\u0020console.log('Promise')\n\u0020\u0020resolve()\n})\n\u0020\u0020.then(function()\u0020{\n\u0020\u0020\u0020\u0020console.log('promise1')\n\u0020\u0020})\n\u0020\u0020.then(function()\u0020{\n\u0020\u0020\u0020\u0020console.log('promise2')\n\u0020\u0020})\n\nconsole.log('script\u0020end')返回结果内容：script\u0020start\nasync2\u0020end\nPromise\nscript\u0020end\nasync1\u0020end\npromise1\npromise2\nsetTimeout