<script language=javascript>
function getSelText()
{
var txt = '';
if (window.getSelection)
{
txt = window.getSelection();
}
else if (document.getSelection)
{
txt = document.getSelection();
}
else if (document.selection)
{
txt = document.selection.createRange().text;
}
return txt;
}
function haha(){
var obj=document.getElementById('test');
if(getSelText()==obj.value){
}else{
obj.select();
}
}
</script>
<input value="xuzhedantest" id='test' onmouseup="haha()" />
<input type="button" value="Get selection" onmousedown="getSelText()">
<form name=aform >
<textarea name="selectedtext" rows="5" cols="20"></textarea>
</form>
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