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go substring

在java下习惯了String.subString(start,end）
然后再golang继续敲substring木有了，看了下代码，也是原生支持的
但是百度发现有些人竟然把字符串转成字符数组再根据下标取，简直误人子弟

go的string 支持直接根据 index 截取字符串的

例如
str := "hello world"
fmt.Print(str[0:5])
运行的时候将会输出
hello

很简单的
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