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純文字版返回頂端的js

2013-11-15 12:14:51  來源: JSP教程 

  <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/201311/20569.html
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