<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>textarea还剩余字数统计 - 懒人建站 http://www.51xuediannao.com/</title>
<style type="text/css">
body,a{ font-size: 14px; color: #555;;}
.wordCount{ position:relative;width: 600px; }
.wordCount textarea{ width: 100%; height: 100px;}
.wordCount .wordwrap{ position:absolute; right: 6px; bottom: 6px;}
.wordCount .word{ color: red; padding: 0 4px;;}
</style>
</head>
<body>
<div class="wordCount" id="wordCount">
<textarea placeholder="textarea还剩余字数统计"></textarea>
<span class="wordwrap"><var class="word">200</var>/200</span>
</div>
<span id="clock"></span>
<script src="http://lib.sinaapp.com/js/jquery/1.10.2/jquery-1.10.2.min.js"></script>
<script>
$(function(){
//先选出 textarea 和 统计字数 dom 节点
var wordCount = $("#wordCount"),
textArea = wordCount.find("textarea"),
word = wordCount.find(".word");
//调用
statInputNum(textArea,word);
});
/*
* 剩余字数统计
* 注意 最大字数只需要在放数字的节点哪里直接写好即可 如：<var class="word">200</var>
*/
function statInputNum(textArea,numItem) {
var max = numItem.text(),
curLength;
textArea[0].setAttribute("maxlength", max);
curLength = textArea.val().length;
numItem.text(max - curLength);
textArea.on(‘input propertychange‘, function () {
numItem.text(max - $(this).val().length);
});
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/cxxjohnson/p/5071386.html