javascript控制textarea复制到剪贴板

javascript控制textarea复制到剪贴板
<script language="javascript">
function clip(text){
str=eval("document." + text)
str.select()
str = document.selection.createRange();
clipboardData.setData('text',(str.text));
}
</script>

<form name='formcopy'><a href='javascript:clip(formcopy.copy)'>复制到剪贴板</a><textarea name='copy' rows='5' id='copy' onclick='javascript:clip(formcopy.copy);'></textarea></form>

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