Merge pull request #560 from jvoisin/if

perf: pre-check raw class attribute in HasClass

property.go

@@ -137,12 +137,16 @@ func (s *Selection) AddClass(class ...string) *Selection {
 // HasClass determines whether any of the matched elements are assigned the
 // given class.
 func (s *Selection) HasClass(class string) bool {
+	rawClass := class
 	class = " " + class + " "
 	for _, n := range s.Nodes {
 		if n.Type != html.ElementNode {
 			continue
 		}
 		if attr := getAttributePtr("class", n); attr != nil {
+			if !strings.Contains(attr.Val, rawClass) {
+				continue
+			}
 			val := classTrimReplacer.Replace(attr.Val)
 			if strings.Contains(" "+val+" ", class) {
 				return true