在Golang中运行JavaScript代码

I need some javascript code inside go code.

package main

import (
    "fmt"
    "net/http"
)
func work(w http.ResponseWriter, r *http.Request){
    fmt.Printf("<script>console.log('javascript working')</script>")

}

func main() {
    http.HandleFunc("/", work)
    http.ListenAndServe(":4000", nil)
}

Running it in browser and see browser's console window there is nothing to see. How do I run javascript code in go code? Because using ajax with golang it is difficult.

Very simple javascript code running in go code is

package main

import (
    "fmt"
    "net/http"
)

func main() {
    hello := "hello yu bn"
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, `<html>
            <head>
            </head>
            <body>
            <h1>Go Timer (ticks every second!)</h1>
            <div id="output"></div>
            <script type="text/javascript">
            console.log("`+hello+`");
            </script>
            </body>
            </html>`)

    })
    http.ListenAndServe(":9000", nil)
}

it is nice! Check browser console!