刷新页面微信二维码图片随机换，点击按钮自动复制对应微信号

<div style="text-align: center;">
<p style="font-size: 18px;color: rgb(255, 79, 121);">添加微信号</p>
<span style="font-size: 18px;margin-left: 10%;" id="cod">jyl88jimei</span><br />
<img src="images/jyl88jimei.jpg" id="img" style=" 80%;" alt="jyl88jimei" />
</div>

<p id="copy" style="background-image:none;">
<img src="images/TiaoDong.png">
</p>

var oImg = document.getElementById("img");
var arr = ["jyl88jimei", "zy88fx", "Lab88fx"];//图片名称
window.onload = function() {
oImg.src ="images/"+ arr[Math.floor(Math.random() * arr.length)] + '.jpg';//图片路径
//先得到图片
var img=document.getElementById("img");
//得到图片路径
var path=oImg.src;
//从路径中截取图片名[包括后缀名]
var filename;
if(path.indexOf("/")>0)//如果包含有"/"号 从最后一个"/"号+1的位置开始截取字符串
{
filename=path.substring(path.lastIndexOf("/")+1,path.length);
}
else
{
filename=path;
}

var tx=filename.substring(0, filename.indexOf('.'));//获取“.”前面的字符串
$("#cod").html(tx);
$(".wxName").html(tx);
function copyArticle(event) {
const range = document.createRange();
range.selectNode(document.getElementById('cod'));
const selection = window.getSelection();
if(selection.rangeCount > 0) selection.removeAllRanges();
selection.addRange(range);
document.execCommand('copy');
alert("复制微信号成功，请前往微信添加好友！")
}
document.getElementById('copy').addEventListener('click', copyArticle, false);

};