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优化了 async 函数内部报错会导致 Promise 对象变为reject状态的例子

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原来的例子并不能很明显的表示打印的内容来自于 reject 的回调。
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docs/async.md
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@ -184,10 +184,10 @@ async function f() {
} }
f().then( f().then(
v => console.log(v), v => console.log(‘resolve’,v),
e => console.log(e) e => console.log('reject',e)
) )
// Error: 出错了 //reject Error: 出错了
``` ```
### Promise 对象的状态变化 ### Promise 对象的状态变化