幫部落格文章加入延伸閱讀的功能

如何讓來看妳部落格的朋友能夠多停留一會兒呢？
就是在文章的後面加上延伸閱讀（有人稱作"相關文章")的功能
可以增加其他文章曝光的機會同時吸引訪客繼續在你的部落格遨遊

有人利用Blogger的Tag(or label)分類，加上Blogger分類也有RSS訂閱
找出和目前這篇文章有相同分類的文章
作為產生相關文章的依據

Google大神找到的第一篇就是Abin's Tech Note: 加入相關文章功能 (Related Post)
不過寫的不是很容易懂，而且做出來有點小問題

我的作法是這樣

1.版面配置->修改HTML
2.記得勾選『展開小裝置範本』
3.找到下面這段程式
</head>

4.在之前貼上下面這段程式
<script type='text/javascript'>
//<![CDATA[
<!-- Script functions for Related Posts: RelatedLabels(), RemoveDuplicatedPosts(), contains(), ShowRelatedPosts()-->
var relatedPostsNum = 0;
var relatedTitles = new Array();
var relatedUrls = new Array();
var relatedDates = new Array();

function RelatedLabels(json) {
for (var i = 0; i < json.feed.entry.length; i++) {
var entry = json.feed.entry[i];
relatedTitles[relatedPostsNum] = entry.title.$t;
relatedDates[relatedPostsNum] = entry.published.$t.substr(0,10);
for (var j = 0; j < entry.link.length; j++) {
if (entry.link[j].rel == 'alternate') {
relatedUrls[relatedPostsNum] = entry.link[j].href;
relatedPostsNum++;
break;
}
}
}
}

function RemoveDuplicatedPosts(PostUrl) {
var tmpUrls = new Array(0);
var tmpTitles = new Array(0);
var tmpDates = new Array(0);
function contains(a, e) {
for(var j = 0; j < a.length; j++)
if (a[j]==e)
return true;
return false;
}
for(var i = 0; i < relatedUrls.length; i++) {
if(!contains(tmpUrls, relatedUrls[i]) && PostUrl != relatedUrls[i]) {
tmpUrls.length += 1;
tmpUrls[tmpUrls.length - 1] = relatedUrls[i];
tmpTitles.length += 1;
tmpTitles[tmpTitles.length - 1] = relatedTitles[i];
tmpDates.length += 1;
tmpDates[tmpDates.length - 1] = relatedDates[i];
}
}
relatedTitles = tmpTitles;
relatedUrls = tmpUrls;
relatedDates = tmpDates;
}

function ShowRelatedPosts(PostUrl) {
RemoveDuplicatedPosts(PostUrl);
var r = Math.floor((relatedTitles.length - 1) * Math.random());
var i = 0;
if (relatedTitles.length > 0) {
document.write('Related Posts: <ul>');
while (i < relatedTitles.length && i < 5) {
document.write('<li><a href="' + relatedUrls[r] + '">' + relatedTitles[r] + '</a> - ' + relatedDates[r] + '</li>');
if (r < relatedTitles.length - 1)
r++;
else
r = 0;
i++;
}
document.write('</ul>');
}
}
//]]>
</script>

5.找到下面這段程式
<b:if cond='data:post.labels'>
<data:postLabelsLabel/>
<b:loop values='data:post.labels' var='label'>
<a expr:href='data:label.url' rel='tag'><data:label.name/></a><b:if cond='data:label.isLast != "true"'>,</b:if>
</b:loop>
</b:if>

6.換成下面這段(請把& 換成 &)
<b:if cond='data:post.labels'>
<data:postLabelsLabel/>
<b:loop values='data:post.labels' var='label'>
<a expr:href='data:label.url' rel='tag'><data:label.name/></a><b:if cond='data:label.isLast != "true"'>,</b:if>
<!-- Fixed for Related Posts -->
<b:if cond='data:blog.pageType == "item"'>
<script expr:src='"/feeds/posts/default/-/" + data:label.name + "?alt=json-in-script&callback=RelatedLabels&max-results=10"' type='text/javascript'/>
</b:if>
</b:loop>
</b:if>

7.最後這段是呈現出延伸閱讀的內容，原文是寫說貼在上面說的那段程式後面就可以，我弄了老半天，發覺要貼在下面這段程式之後。
<span class="fullpost"><span class="fullpost"><code><p class="'post-footer-line">
</div>

8.在之後貼上下面這段
<!-- Fixed for Related Posts -->
<b:if cond='data:blog.pageType == "item"'>
<script type='text/javascript'>
ShowRelatedPosts('<data:post.url/>');
</script>
</b:if>