开发项目中经常会用到，textarea统计字数
源码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>wordCount字数统计</title>
<script type="text/javascript" src="jquery-1.10.1.min.js"></script>
<style type="text/css">
body,a {
font-size: 14px;
color: #555;
}
.wordCount {
position: relative;
600px;
}
.wordCount textarea {
100%;
height: 100px;
}
.wordCount .wordwrap {
position: absolute;
right: 6px;
bottom: 6px;
}
.wordCount .word {
color: red;
padding: 0 4px;
}
</style>
<script type="text/javascript">
$(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 () {
var _value = $(this).val().replace(/
/gi,"");
numItem.text(max - _value.length);
});
}
</script>
</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>
</body>
</html>