以前持续用一个变量这个最坑，不小心就掉进去了，这次解决了

Go 1.22 makes two changes to "for" loops.

Previously, the variables declared by a "for" loop were created once and updated by each iteration. In Go 1.22, each iteration of the loop creates new variables, to avoid accidental sharing bugs. The transition support tooling described in the proposal continues to work in the same way it did in Go 1.21.
"For" loops may now range over integers. For example:
package main

import "fmt"

func main() {
  for i := range 10 {
    fmt.Println(10 - i)
  }
  fmt.Println("go1.22 has lift-off!")
}
See the spec for details.
Go 1.22 includes a preview of a language change we are considering for a future version of Go: range-over-function iterators. Building with GOEXPERIMENT=rangefunc enables this feature.
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