strings的分割
如下strings.Split无法判断字符串中是否有某个字段，要用strings.Contains：
func strings_split() {
a := ""
needs := strings.Split(a, ",")
fmt.Println("needs", needs, len(needs))
for _, need := range needs {
fmt.Println("need", need)
}
fmt.Println(strings.Contains(a, ","))
}结果如下，无法通过needs的长度来判断是否包含了某个字段：
needs [] 1
need
false
其实 Split 函数的注释写的很清楚：
// If s does not contain sep and sep is not empty, Split returns a
// slice of length 1 whose only element is s.
strings的剪切
如下strings.TrimLeft无法切断某一个字符串，要用strings.TrimPrefix：
func strings_TrimLeft() {
a := "not enough arguments in call to route.MergeGpsRouteSummary"
fmt.Println(strings.TrimLeft(a, "not enough arguments in call to "))
}结果如下：
.MergeGpsRouteSummary