RESVANS56

<script type='text/javascript'>
(function() {
var po = document.createElement(&#39;script&#39;); po.type = &#39;text/javascript&#39;; po.async = true;
po.src = &#39;https://apis.google.com/js/plusone.js&#39;;
var s = document.getElementsByTagName(&#39;script&#39;)[0]; s.parentNode.insertBefore(po, s);
})();
</script>

<script type='text/javascript'>
var thumbnail_mode = &quot;yes&quot;; //yes-dengan gambar,no-tanpa gambar
summary_noimg = 300;
summary_img = 255;
img_thumb_height = 100;
img_thumb_width = 125;
</script>
<script type='text/javascript'>
//<![CDATA[
function removeHtmlTag(strx,chop){
if(strx.indexOf("<")!=-1)
{
var s = strx.split("<");
for(var i=0;i<s.length;i++){
if(s[i].indexOf(">")!=-1){
s[i] = s[i].substring(s[i].indexOf(">")+1,s[i].length);
}
}
strx = s.join("");
}
chop = (chop < strx.length-1) ? chop : strx.length-2;
while(strx.charAt(chop-1)!=' ' && strx.indexOf(' ',chop)!=-1) chop++;
strx = strx.substring(0,chop-1);
return strx+'...';
}

function createSummaryAndThumb(pID){
var div = document.getElementById(pID);
var imgtag = "";
var img = div.getElementsByTagName("img");
var summ = summary_noimg;
if(thumbnail_mode == "yes") {
if(img.length>=1) {
imgtag = '<span style="float:left; padding:0px 10px 5px 0px;"><img src="'+img[0].src+'" width="'+img_thumb_width+'px" height="'+img_thumb_height+'px"/></span>';
summ = summary_img;
}
}
var summary = imgtag + '<div>' + removeHtmlTag(div.innerHTML,summ) + '</div>';
div.innerHTML = summary;
}
//]]>
</script>

Keterangan: 

• 300 = jumlah karakter read more artikel tanpa gambar.
• 255 = jumlah karakter read more artikel dengan gambar.
• 100 = tinggi gambar artikel yang ingin ditampilkan pada read more.
• 125 = lebar gambar artikel yang ingin ditampilkan pada read more.

7. Masih di Edit HTML, cari kode <data:post.body/>, jika ada 2 pilihlah kode yang ke-2.

8. Ganti kode <data:post.body/> yang ke-2 dengan kode di bawah ini.

<b:if cond='data:blog.pageType != &quot;item&quot;'>
<div expr:id='&quot;summary&quot; + data:post.id'><data:post.body/></div>
<script type='text/javascript'>createSummaryAndThumb
(&quot;summary<data:post.id/>&quot;);
</script>
</b:if>
<b:if cond='data:blog.pageType == &quot;item&quot;'><data:post.body/>
</b:if>

Sumber: http://www.tuliskan.com/2013/03/cara-membuat-read-more-otomatis-di-blog.html#ixzz2UP1qdeio