1type Template struct {
 2	name string // template的名称
 3	*parse.Tree // 解析树
 4	*common 
 5  leftDelim  string // 左边分隔符，默认为{{}}
 6	rightDelim string // 左边分隔符，默认为{{}} 
 7}
 8
 9type common struct {
10  // 所有的template共享同一个common
11	tmpl   map[string]*Template // Map from name to defined templates.
12	option option
13	// We use two maps, one for parsing and one for execution.
14	// This separation makes the API cleaner since it doesn't
15	// expose reflection to the client.
16	muFuncs    sync.RWMutex // protects parseFuncs and execFuncs
17	parseFuncs FuncMap
18	execFuncs  map[string]reflect.Value
19}