为什么这个jQuery代码不工作，如果我添加类到<P>
有用
var tip = "<p>Most computers will open PDF documents automatically, but you may need to download <a title='Link to Adobe website-opens in a new window'";
tip +=" href='http://www.adobe.com/products/acrobat/readstep2.html' target='_blank'>Adobe Reader</a>.</p>";
if($("div#maincontent a[href*='.pdf']").length>0){
$("div#maincontent").children(":last-child").after(tip);
但不是
var tip = "<p class="adobe-reader-download">Most computers will open PDF documents automatically, but you may need to download <a title='Link to Adobe website-opens in a new window'";
tip +=" href='http://www.adobe.com/products/acrobat/readstep2.html' target='_blank'>Adobe Reader</a>.</p>";
if($("div#maincontent a[href*='.pdf']").length>0){
$("div#maincontent").children(":last-child").after(tip);
您在这里使用双引号来表示adobe-reader-download
var tip = "<p class="adobe-reader-download">
尝试这个：
var tip = "<p class="adobe-reader-download">
注意：如果您为整个字符串使用单引号，则不需要转义双引号。
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