返回值自动包装为Promise：即使函数内部返回的是一个普通值，这个值也会被自动包装成一个已解决的Promise。 async function foo () { return 42; // 等价于 return Promise.resolve (42) } 函数内部可以使用await关键字：await只能在async函数内部使用，它用于暂停函数的执行，等待一个Promise的解决。

async/await 不是锦上添花的“高级写法”，它是 JavaScript 异步模型从回调地狱走向可维护性的分水岭。 它把 Promise 链式调用这种“声明式流水线作业”，转化成了看起来像同步代码的“命令式执行流”。

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