vue项目判断是否可以访问公网

vue项目判断是否可以访问公网

      var httpRequest = new XMLHttpRequest()
      //获取一个公网链接
      httpRequest.open('GET', 'https://lbs.netease.im/lbs/webconf.jsp', true)
      httpRequest.timeout = 30*1000
 
      // 请求成功
      httpRequest.onload = function () 
        if (httpRequest.readyState === 4 && httpRequest.status === 200) {
          console.log('可以访问公网')
        }else{
          console.log('不能访问公网')
        }
      }
      // 响应超时
      httpRequest.ontimeout = function (e) {
       console.log('不能访问公网')
      }
      httpRequest.send()