<script>
function selectText(x) {
    if (document.selection) {
        var range = document.body.createTextRange();//ie
        range.moveToElementText(x);
        range.select();
    } else if (window.getSelection) {
        var selection = window.getSelection();
        var range = document.createRange();
        selection.removeAllRanges();
        range.selectNodeContents(x);
        selection.addRange(range);
    }
    //参考：http://blog.csdn.net/boyit0/article/details/41082941
}
function cp(x)
{
selectText(x);
document.execCommand("copy");
}
</script>
<span id="biao1" class="c3 ins">${loginSession}</span>
<input type="button" value="复制" id="copyBut" onclick="cp(document.getElementById('biao1'));" class="l30 w100 f12 cur cf bg-red bnone tc ibk ml25" />