首先在点击事件中打印这句

break是我的iframe的id

console.log(self.parent.document.getElementById("break").src);

 如果打印出来的路径是对的就对src进行赋值(建议先把路径赋值给一个变量)

let URL = "./Views/JieDao/WoDeBiaoDan/BiaoDanRenWuXiaFa/YuanMuBiao.html";
self.parent.document.getElementById("break").src = URL;