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golang判断字符串是否为空的方法：
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或：
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推荐使用第一种方法判断字符串是否为空，就字符串是否为空这个语义而言，第一种语义更直接了当，应该是更推荐的。
> The one that makes the code clear.
If I'm about to look at element x I typically write
len(s) > x, even for x == 0, but if I care about
"is it this specific string" I tend to write s == "".
>
>It's reasonable to assume that a mature compiler will compile
len(s) == 0 and s == "" into the same, efficient code.
Right now 6g etc do compile s == "" into a function call
while len(s) == 0 is not, but that's been on my to-do list to fix.
>Make the code clear.
>
>Russ
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