取得input元素中部分选中(selected)的值

答案：From: http://www.7419.com/article.asp?id=216 

<script language="javascript">  
var agt=navigator.userAgent.toLowerCase();  
var ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1) && (agt.indexOf("omniweb") == -1));  

function a(){  
var myArea = document.getElementById("s");   
var selection;   
if (!ie){   
if (myArea.selectionStart!= undefined) {   
selection = myArea.value.substr(myArea.selectionStart, myArea.selectionEnd - myArea.selectionStart);   
}   
}else{   
if (window.getSelection){   
selection = window.getSelection();   
}else if (document.getSelection){   
selection = document.getSelection();   
}else if (document.selection){   
selection = document.selection.createRange().text;   
}   
}  
alert(selection)   
}  

</script>  
<input type="text" value="testtest" id="s" name="s"  
onmouseup="javascript:a()" />
  [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]

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