本文实例讲述了jQuery实现简易的输入框字数计数功能。分享给大家供大家参考，具体如下：
运行效果图如下：
具体代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="https://www.jiangweishan.com/zb_system/script/common.js" type="text/javascript"></script>
</head>
<body>
<div>
<input id="abc" value="Web前端之家"><span id="wordCountShow"></span>
</div>
<script>
$.fn.extend({
wordCount: function (maxLength, wordWrapper) {
var self = this;
$(self).attr("maxlength", maxLength);
showWordCount();
$(this).on("input propertychange", showWordCount);
function showWordCount() {
curLength = $(self).val().length;
var leaveCount = maxLength - curLength;
wordWrapper.text(leaveCount + "/" + maxLength);
}
}
})
$(function () {
$("#abc").wordCount(10, $("#wordCountShow"));
})
</script>
</body>
</html>
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