function copyUrl  () {

        var div = document.getElementById('xxxx');

        if (document.body.createTextRange) {

            var range = document.body.createTextRange();

            range.moveToElementText(div);

            range.select();

        } else if (window.getSelection) {

            var selection = window.getSelection();

            var range = document.createRange();

            range.selectNodeContents(div);

            selection.removeAllRanges();

            selection.addRange(range);

            /*if(selection.setBaseAndExtent){

                selection.setBaseAndExtent(text, 0, text, 1);

            }*/

        } else {

            console.warn("none");

        }

        document.execCommand("Copy"); // 执行浏览器复制命令

        alert("已复制好，可贴粘。");

    }