纯js 定时发送请求

function heartbeat(){
  console.log("调用了");
  var status = true;
  DiGui = function (param) {
    $.ajax({
      url:'/start',  
      type:"get",  
      data: param,
      timeout:3000,  
      headers:{"idd":imagesID },
      beforeSend:function(){  
        console.log("正在获取数据...");  
      },  
      success: function (returnValue) {
        if (status) {
          status = false; 
          window.setInterval("DiGui()", 3000);
        }
      }
    });
  }
  DiGui(imagesID)
    }