golang实现的xpath选择器，使用更简单。
go get -u github.com/lizongying/go-xpath@latest
有关更多用法，请参考测试文件。 selector_test
package main
import (
"fmt"
"github.com/lizongying/go-xpath/xpath"
)
func main() {
html := `<html class="abc">....<div class="def">....</div><div class="gkl">123</div></html>`
x, _ := xpath.NewSelectorFromStr(html)
s := x.FindStrOne(`//div[@class="def"]/text()`)
//....
fmt.Println(s)
i := x.FindIntOneOr(`//div[@class="gkl"]/text()`, 111)
//123
fmt.Println(i)
i = x.FindIntOneOr(`//div[@class="mn"]/text()`, 111)
//111
fmt.Println(i)
sl := x.FindStrMany(`//div/text()`)
//[.... 123]
fmt.Println(sl)
s = x.FindNodeOne(`//html[@class="abc"]`).FindStrOne(`.//div[@class="gkl"]`)
//123
fmt.Println(s)
}