純文字版返回頂端的js代碼

這篇文章介紹了純文字版返回頂端的js代碼有需要的朋友可以參考一下   復制代碼 代碼如下:

　　
<script language="javascript">
var goto_top_type = ;
var goto_top_itv = ;
function goto_top_timer() {
 var y = goto_top_type == ? documentdocumentElementscrollTop
   : documentbodyscrollTop;
 var moveby = ;
 y = Mathceil(y * moveby / );
 if (y < ) {
  y = ;
 }
 if (goto_top_type == ) {
  documentdocumentElementscrollTop = y;
 } else {
  documentbodyscrollTop = y;
 }
 if (y == ) {
  clearInterval(goto_top_itv);
  goto_top_itv = ;
 }
}
function goto_top() {
 if (goto_top_itv == ) {
  if (documentdocumentElement && documentdocumentElementscrollTop) {
   goto_top_type = ;
  } else if (documentbody && documentbodyscrollTop) {
   goto_top_type = ;
  } else {
   goto_top_type = ;
  }
  if (goto_top_type > ) {
   goto_top_itv = setInterval(goto_top_timer() );
  }
 }
}
</script>
<a href="javascript:void()" onclick="goto_top()">【返回頂部】</a>

From:http://tw.wingwit.com/Article/program/Java/JSP/201311/19977.html