みたび間違えたよ

JavaScript

http://okwave.jp/qa/q9131681.html

idx=1 だよな

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>q9131681.html</title>

<body>
<dl id="hoge">
<dd>222</dd>
<dd>333</dd>
<dd>AAA</dd>
<dd>AAB</dd>
<dd>BBB</dd>
<dd>BBC</dd>
<dd>CCC</dd>
<dd>CCD</dd>
</dl>


<script>
function firstCharType (e) {
　var t = e.textContent.charAt (0);
　return /\d/.test (t) ? '数値': t;
}

function appendDT (e, c, i) {
　var dt = e.ownerDocument.createElement ('dt');
　dt.textContent = c + 'から始まる';
　dt.id = 'list' + i;
　e.parentNode.insertBefore (dt, e);
}


var dd = Array.prototype.slice.call (document.querySelectorAll ('#hoge dd'));
var cs = dd.map (firstCharType);

for (var idx = 1, t = null, i = 0; c = cs[i]; i++)
　if (c !== t)
　　appendDT (dd[i], c, idx++), t = c;

</script>