<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="auther" content="fq" />
<title>监听输入框值的即时变化 onpropertychange oninput</title>
<script type="text/javascript">
function immediately() {
var element = document.getElementById("mytext");
if ("\v" == "v") {
element.onpropertychange = webChange;
} else {
element.addEventListener("input", webChange, false);
}
function webChange() {
if (element.value) {
document.getElementById("test").innerHTML = element.value
};
}
}
</script>
</head>
<body>
<input type="text" name="textfield" oninput="document.getElementById(‘webtest‘).innerHTML=this.value;" onpropertychange="document.getElementById(‘webtest‘).innerHTML=this.value;" />
<div>您输入的值为：<span id="webtest">还未输入</span></div>
<br />
<br />
<br />
<br />
<br /> 写在JS中的示例：
<input type="text" name="textfield" id="mytext" />
<input type="number" name="" id="" min="0" max="1"/>
<div>您输入的值为：<span id="test">还未输入</span></div>
<script type="text/javascript">
immediately();
</script>
</body>
</html>原文：http://my.oschina.net/u/2345713/blog/491288