首頁猿問為什么這段代碼無法輸出變量 b

為什么這段代碼無法輸出變量 b

JavaScript

玉鴦子 2016-09-24 18:24:30

<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>nextSibling</title></head><body><ul id="u1">? ???????????? <li id="a">javascript</li>? ???????????? <li id="b">jquery</li>? ???????????? <li id="c">html</li>? ???????? </ul>? ???????? <ul id="u2">? ???????????? <li id="d">css3</li>? ???????????? <li id="e">php</li>? ???????????? <li id="f">java</li>? ???????? </ul>? ?<script type="text/javascript">??? function get_previouSibling(n){??????? var a=n.previouSibling;??????? while(a.previouSibling!=1){??????????? a=a.previouSibling;??????? }??????? return a;??? }?? ???? var a=document.getElementsByTagName("li")[1];??? document.write(a.nodeName);??? document.write("=");??? document.write(a.innerHTML);?? ???? b=get_previouSibling(a);? ??? document.write("<br />"+"<br />");??? document.write(b.nodeName);??? document.write("=");??? document.weite(b.innerHTML);</script></body></html>

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2 回答

已采納

千秋此意

TA貢獻158條經(jīng)驗獲得超188個贊

?????????function?get_previouSibling(n)?{
????????????var?a?=?n.previousSibling;
????????????while?(a.nodeType?!==?1)?{
????????????????a?=?a.previousSibling;
????????????}
????????????return?a;
????????}

????????var?a?=?document.getElementsByTagName("li")[1];
????????document.write(a.nodeName);
????????document.write("=");
????????document.write(a.innerHTML);

????????b?=?get_previouSibling(a);

????????document.write("<br?/>"?+?"<br?/>");
????????document.write(b.nodeName);
????????document.write("=");
????????document.write(b.innerHTML);

兩個地方單詞拼錯了 previouSibling 應(yīng)該是 previousSibling

最后一行的 write 寫成了 weite

while(a.previouSibling!=1)

改成了while (a.nodeType !== 1)
node對象的的nodeType屬性=1時表示該對象是元素節(jié)點

反對回復(fù) 2016-09-24