点击按钮，实现复制网址的代码

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<button onclick="copyToClipBoard()">复制本贴地址发送给好朋友</button>

调用函数

<script language="javascript">
function copyToClipBoard(){
var clipBoardContent="";
clipBoardContent+=document.URL
window.clipboardData.setData("Text",clipBoardContent);
alert("复制成功");
}
</script>