golang template: “xxx.html“ is an incomplete or empty template 解决方法

这个异常一般是因为在使用 template.New("xxx.html") 时这里的名称非真实存在的视图文件名导致， 这个地方有点坑， 明明ParseFiles函数已经指定了视图路径了，而这里的New里面的名字居然还必须是你后面指定的视图路径中的文件名！  

     解决方法就是将 template.New("xxx.html") 这里的xxx.html改为你的真实存在的视图文件的名称。 注意必须是包含后缀的文件名

导致这个问题的原因是Template里面的这escape方法，代码如下：

 
// escape escapes all associated templates.
func (t *Template) escape() error {
	t.nameSpace.mu.Lock()
	defer t.nameSpace.mu.Unlock()
	t.nameSpace.escaped = true
	if t.escapeErr == nil {
		if t.Tree == nil {
			return fmt.Errorf("template: %q is an incomplete or empty template", t.Name())
		}
		if err := escapeTemplate(t, t.text.Root, t.Name()); err != nil {
			return err
		}
	} else if t.escapeErr != escapeOK {
		return t.escapeErr
	}
	return nil
}
 
// Execute applies a parsed template to the specified data object,
// writing the output to wr.
// If an error occurs executing the template or writing its output,
// execution stops, but partial results may already have been written to
// the output writer.
// A template may be executed safely in parallel, although if parallel
// executions share a Writer the output may be interleaved.
func (t *Template) Execute(wr io.Writer, data any) error {
	if err := t.escape(); err != nil {
		return err
	}
	return t.text.Execute(wr, data)
}
 
// ExecuteTemplate applies the template associated with t that has the given
// name to the specified data object and writes the output to wr.
// If an error occurs executing the template or writing its output,
// execution stops, but partial results may already have been written to
// the output writer.
// A template may be executed safely in parallel, although if parallel
// executions share a Writer the output may be interleaved.
func (t *Template) ExecuteTemplate(wr io.Writer, name string, data any) error {
	tmpl, err := t.lookupAndEscapeTemplate(name)
	if err != nil {
		return err
	}
	return tmpl.text.Execute(wr, data)
}