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统一“抽象操作的运行流程”的描述
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Ruan YiFeng 2020-04-01 22:40:45 +08:00 committed by GitHub
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@ -70,12 +70,12 @@ F.[[Call]](V, argumentsList)
抽象操作的运行流程，一般是下面这样。
> 1. Let `resultCompletionRecord` be `AbstractOp()`.
> 1. If `resultCompletionRecord` is an abrupt completion, return `resultCompletionRecord`.
> 1. Let `result` be `resultCompletionRecord.[[Value]]`.
> 1. Let `result` be `AbstractOp()`.
> 1. If `result` is an abrupt completion, return `result`.
> 1. Set `result` to `result.[[Value]]`.
> 1. return `result`.
上面的第一步是调用抽象操作`AbstractOp()`，得到`resultCompletionRecord`，这是一个 Completion Record。第二步，如果这个 Record 属于 abrupt completion，就将`resultCompletionRecord`返回给用户。如果此处没有返回，就表示运行结果正常，所得的值存放在`resultCompletionRecord.[[Value]]`属性。第三步，将这个值记为`result`。第四步，将`result`返回给用户。
上面的第一步调用了抽象操作`AbstractOp()`，得到`result`，这是一个 Completion Record。第二步，如果`result`属于 abrupt completion，就直接返回。如果此处没有返回，表示`result`属于 normal completion。第三步，将`result`的值设置为`resultCompletionRecord.[[Value]]`。第四步，返回`result`。
ES6 规格将这个标准流程，使用简写的方式表达。