HTTP错误条件代码可以由错误函数捕获。

HTTP error condition codes can be caught by the error function.

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下面的清单1包含实现这一目标的基本条件代码。

Listing 1 below contains basic conditional code that could achieve this goal.

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透明性：前置和后置条件代码不与业务逻辑混合。

Transparency: The pre - and post-condition code isn't mixed with business logic.

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You can say if this is true, then go and do the following pieces of code or puzzle pieces that are inside this part of the block, else go ahead and do these that are down here.

你可以说如果条件成立，执行下面的代码段,或板块中的拼图，否则跳过去执行这下面的语句。

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So in other words, if thankful is still false at this point, it means this condition did not work out very well, and so I'm going to do this block of code again.

换句话说，如果thankful在这时候还是false值，这表示这个条件没有实现地很好，所以我将再次去处理这段代码。

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As an aside, if you ever just have one line of code that you want to execute, one puzzle piece in Scratch terminology, ; you actually don't need the curly braces; you only need the curly braces if you have two or more lines of code that you want to execute if that condition is true.

此外，如果你只有一行代码,需要执行，在Scratch，术语中叫做,一句代码，你就不需要使用花括号了;,如果那个条件成立，你有两行或更多行的代码时需要执行时,你就需要花括号。

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