<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>RunJS</title>
<script id="jquery_183" type="text/javascript" class="library" src="/js/sandbox/jquery/jquery-1.8.3.min.js"></script>
</head>
<body>
<h1 >
实时监测input中值的变化
</h1>
<input type="text" id="username" autoComplete=‘off‘>
<div id="result"></div>
</body>
</html>
$(function(){
$(‘#username‘).bind(‘input propertychange‘, function() {
$(‘#result‘).html($(this).val().length + ‘ characters‘);
});
})
$(document).ready(function () {
$(‘#phonenum,#verifycode‘).bind(‘input propertychange‘,$(‘#verifycode‘).bind(‘input propertychange‘), function(){
btnSwitch()
btnApplySwith()
})
})
原文：https://www.cnblogs.com/deepalley/p/13215657.html