关于前端如何导出后台传来的excel接口

 function exportExcel() {
        var encodeParam = function (json) {
          var tmps = [];
          for (var key in json) {
              tmps.push(key + '=' + json[key]);
          }
          return tmps.join('&');
        }
        
        var url = "请求地址" + encodeParam(form);
        console.log(url)
        //判断是否有id为_exportForm的form表单，如果没有则创建一个隐藏的form，把url放入，然后submit
        var exportForm = document.getElementById("_exportForm");
        if (!exportForm) {
          exportForm = document.createElement("form");
          exportForm.setAttribute('id', "_exportForm");
          exportForm.setAttribute("action", url);
          exportForm.setAttribute("method", "post");
        }
        document.body.appendChild(exportForm);
        exportForm.submit();
        document.body.removeChild(exportForm);//导出成功后将form元素移除以免影响下一次导出
      },