JS复制特定内容到粘贴板

<scriptlanguage="javascript">
functionreadTxt()
{
alert(window.clipboardData.getData("text"));
}
functionsetTxt()
{
vart=document.getElementById("txt");
t.select();
window.clipboardData.setData("text",t.createTextRange().text);
}
</script>
<inputname="txt"value="测试">
<inputtype="button"value="复制"onclick="setTxt()">
<inputtype="button"value="读取"onclick="readTxt()">