<script language="javascript">

function readTxt()

{

alert(window.clipboardData.getData("text"));

}

function setTxt()

{

var t=document.getElementById("txt");

t.select();

window.clipboardData.setData('text',t.createTextRange().text);

}

</script>

<input name="txt" value="测试">

<input type="button" value="复制">

<input type="button" value="读取">