您应该将变量作为 template.HTML 传递，而不是 string ：

  tpl：= template.Must（template.New main）。Parse（`{{defineT}} {{。Html}} {{。String}} {{end}}`））
 tplVars：= map [string] interface {} {
Html：template.HTML（< p>段落< / p>），
字符串：< p>段落< / p>，
 } 
 tpl.ExecuteTemplate（os.Stdout，T，tplVars）

 // OUTPUT：< p>段落< / p>& lt; p& gt;段落& & gt; 
 

https://play.golang.org/p/QKKpQJ7gIs

正如您所看到的，我们作为 template.HTML 传递的变量不会被转义，而是作为字符串传递的变量是。

I have a template in golang where I have a string that looks something like this:

<some_html> {{ .SomeOtherHTML }} </some_html>

I'm expecting an output to be something like this:

<some_html> <the_other_html/> </some_html>

But instead I'm seeing something like this:

<some_html> &lt;the_other_html/&lt; </some_html>

I'm also trying to insert some JSON but golang is escaping characters and adding things like " in places they shouldn't be.

How do I insert into an HTML template in golang without this happening?

You should pass the variable as a template.HTML and not as a string:

tpl := template.Must(template.New("main").Parse(`{{define "T"}}{{.Html}}{{.String}}{{end}}`))
tplVars := map[string]interface{} {
    "Html": template.HTML("<p>Paragraph</p>"),
    "String": "<p>Paragraph</p>",
}
tpl.ExecuteTemplate(os.Stdout, "T", tplVars)

//OUTPUT: <p>Paragraph</p>&lt;p&gt;Paragraph&lt;/p&gt;

https://play.golang.org/p/QKKpQJ7gIs

As you can see, the variable we passed as a template.HTML is not escaped, but the one passed as a stringis.