js即时监听文本内容

<script type="text/javascript">   
//其他浏览器   
function OnInput (event) {   
            alert ("文本内容: " + event.target.value);   
        }   
    // IE浏览器   
        function OnPropChanged (event) {   
            if (event.propertyName.toLowerCase () == "value") {   
                alert ("文本内容: " + event.srcElement.value);   
            }   
        }   
</script>   
<input type="text" id="info" oninput="OnInput (event)" onpropertychange="OnPropChanged (event)" value="Text field" />  

//监听输入框值的即时变化   
<script>   
        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>   
//写在js   
<input type="text" name="textfield" id="mytext" onclick="immediately()"/>    
<div>您输入的值为：<span id="test">还未输入</span></div>    
//直接写在页面     
<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>