js监听

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 <script type="text/javascript">
function testdemo(){
var element = document.getElementById("myname");
if("/v"=="v") {
element.onpropertychange = textChange;
}else{
element.addEventListener("input",textChange,false);

}
function textChange(){


 document.getElementById("tno").innerHTML=element.value;
}
}
</script>


<body>
<input type="text" name="myname" Width="500px" height="900px"   maxlength="2000" value="123"  id="myname" />

<SPAN style="COLOR: red" id="tno"></SPAN>

<script type="text/javascript">
testdemo();
</script>

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