<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="http://www.jq22.com/jquery/jquery-3.3.1.js"></script>
</head>
<body>
<input value="123" onpropertychange="onChanged(e)" id="myInput" />
</body>
<script >
$(function(){
var value=$("#myInput").val()
setInterval(function(){
value === $("#myInput").val()
?//
aa()
:
console.log("修改了"),
value=$("#myInput").val();
},200)
setInterval(function(){
$("#myInput").val("123123");
},2000)
function aa(){
console.log("没动过1")
console.log("没动过2")
}
});
</script>
</html>
时时监听 JavaScript改变 input 值 input输入框内容 value 变化实时监听
原文：https://www.cnblogs.com/humi/p/10613860.html