源码
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package strings
// Compare returns an integer comparing two strings lexicographically.
// Compare返回一个整数，以字典方式比较两个字符串。
// The result will be 0 if a == b, -1 if a < b, and +1 if a > b.
// 如果a==b，结果将为0，如果a<b，则为-1，如果a>b，则结果为+1。
// Compare is included only for symmetry with package bytes.
// Compare仅用于与bytes包对称。
// It is usually clearer and always faster to use the built-in
// string comparison operators ==, <, >, and so on.
// 使用内置的字符串比较运算符==、<、>等通常更清晰、更快速
func Compare(a, b string) int {
// NOTE(rsc): This function does NOT call the runtime cmpstring function,
// because we do not want to provide any performance justification for
// using strings.Compare. Basically no one should use strings.Compare.
// As the comment above says, it is here only for symmetry with package bytes.
// If performance is important, the compiler should be changed to recognize
// the pattern so that all code doing three-way comparisons, not just code
// using strings.Compare, can benefit.
// 注意（rsc）：这个函数不调用运行时cmpstring函数，因为我们不想为使用strings.Compare提供任何性能理由。
// 基本上没有人应该使用strings.Compare。正如上面的评论所说，它在这里只是为了与包字节对称。
// 如果性能很重要，应该更改编译器以识别模式，这样所有进行三元比较的代码，而不仅仅是使用字符串的代码。Compare，都会受益。
if a == b {
return 0
}
if a < b {
return -1
}
return +1
}