//複製到剪下板
function copyToClipboard(elem) {
    var targetId = "_hiddenCopyText_";
var isInput = elem.tagName === "INPUT" || elem.tagName === "TEXTAREA";
var origSelectionStart, origSelectionEnd;
if (isInput) {
        // 如果是input標籤或textarea，則直接指定該節點
target = elem;
origSelectionStart = elem.selectionStart
 
;
origSelectionEnd = elem.selectionEnd;
} else {
        // 如果不是，則使用節點的textContent
target = document.getElementById(targetId);
if (!target) {
            //如果不存在，則建立一個
var target = document.createElement("textarea");
target.style.position = "absolute";
target.style.left = "-9999px";
target.style.top = "0"
 
;
target.id = targetId;
document.body.appendChild(target);
}
        target.textContent = elem.textContent;
}
    // 聚焦目標節點，選中它的內容
var currentFocus = document.activeElement;
target.focus();
target.setSelectionRange(0, target.value.length);
// 進行復制操作
var succeed;
try {
        succeed = document.execCommand
 
("copy");
layer.open({
                type: 1,
title: false,
closeBtn: 1,
area:['440px','250px'],
skin: 'layui-layer-nobg', //沒有背景色
shadeClose: true, content: $("#copyTip")
            });
} catch(e) {
        succeed = false;
layer.open({
            type: 1,
title: false,
closeBtn: 1,
area:['440px','250px'],
skin: 'layui-layer-nobg', //沒有背景色
shadeClose: true, content: $("#copyErrTip")
        });
}
    // 不再聚焦
if (currentFocus && typeof currentFocus.focus === "function") {
        currentFocus.focus();
}

    if (isInput) {
        // 清空臨時資料
elem.setSelectionRange(origSelectionStart, origSelectionEnd);
} else {
        // 清空臨時資料
target.textContent = "";
}
    return succeed;
}
$("#copy").on('click',function(){
   var copytxt=document.querySelector('#copy');
copyToClipboard(copytxt);
});