<p
              v-for="item in list"
              :key="item.id"
              @click="down(item)"
            >
              {{ item.file_name }}
            </p>

const down= (item) => {
  const x = new XMLHttpRequest();
  x.open("GET", url, true); //url为文件地址 （请求地址 + item.file_url）
  x.responseType = "blob";
  x.onload = () => {
    const url = URL.createObjectURL(x.response);
    const a = document.createElement("a");
    a.href = url;
    a.download = item.file_name;
    a.target = "_blank";
    a.click();
  };
  x.send();
};