不知道那里問題，就是不出效果
<script type="text/javascript">?
function second_count(){
??? var num=document.getElementById("id").innerHtml;
??? num=num-1;
??? if(num>=0){
??????? setTimeout("second_count()",1000);
??????? document.getElementById("id").innerHtml=num;
??? }else {
??????? window.open("http://www.xianlaiwan.cn")
??? }
?}
?second_count();?
?function backFn(){
???? window.history.back();
?}
?</script>
2016-07-30
<!DOCTYPE?html> <html> ?<head> ??<title>瀏覽器對象</title>?? ??<meta?http-equiv="Content-Type"?content="text/html;?charset=gkb"/>??? ?</head> ?<body> ??<!--先編寫好網頁布局--> ??<h2>操作成功</h2> ??<p><span?id="id">5</span>秒后回到主頁<a?href=""?onclick="backFn()">返回</a></p> ? <script?type="text/javascript">?? var?num?=document.getElementById("id").innerHTML; function?second_count(){ ???? ????num=num-1; document.getElementById("id").innerHTML=num; ????if(num＝=0){ ???????? ??????? ????} ?} ?setInterval("second_count()",1000); ?</script>? </body> </html>修改了一下
1.setInterval("second_count()",1000);要放在函數外，放在函數內就無法調用自身
2.innerHTML后面的HTML是大寫的