html css document,javascript - Including JS and CSS in an HTML document? - Stack Overflow

I'm running an http server instance with Go and I would like to return the HTML doc to a client, but the JS and the CSS files are not working. How do I make the JS and CSS get sent along with the HTML if they are in different files?

Go Code

package main

import (

"fmt"

"io/ioutil"

"net/http"

)

func main() {

http.HandleFunc("/", handler)

http.ListenAndServe(":8080", nil)

}

func handler(w http.ResponseWriter, r *http.Request) {

w.Header().Set("Content-Type", "text/html")

file, _ := ioutil.ReadFile("webpage.html")

s := string(file)

fmt.Fprintf(w, s)

}

webpage.html

html file

Click to change color

And changeColor.js

function init(){

var h1tags = document.getElementsByTagName("h1");

h1tags[0].onclick = changeColor;

}

function changeColor(){

this.style.color = '#000000';

}

onload = init;

CSS is in a file called styles.css in the same directory as the HTML doc.