<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>style樣式</title></head><body>? ?<h2>操作成功<h2/>? <span id="sec">5<span/>? <span>秒后回到主頁(yè)<input type="button" value="返回" onclick="dd()"> </span><!--先編寫(xiě)好網(wǎng)頁(yè)布局-->????? <script type="text/javascript"> ??var secd=5;??function lala(){? ? ?secd--;? ? ?document.getElementById("sec").innerHTML=secd;?};setInterval("lala()",1000);</script></body></html>
為什么執(zhí)行讀秒后，“秒后回到主頁(yè)”的字符串會(huì)消失？
慕用4288045
2016-11-04 15:48:02
