golang判断字符串是否为空的方法：
var s string
if s=="" {
}或：
if len(s)==0{}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 writelen(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 compilelen(s) == 0 and s == "" into the same, efficient code.Right now 6g etc do compile s == "" into a function callwhile 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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