移动端JS怎么直接调用webservice接口呢？

Question

移动端JS怎么直接调用webservice接口呢？

testXML () {
      let xmlStr =
      '<?xml version="1.0" encoding="UTF-8"?>' +
      '<params>' +
      '<safety>' +
        '<clientcode>ImageCenter</clientcode>' +
        '<servicecode>CheckInvoice</servicecode>' +
        '<time>20171114101333</time>' +
        '<ticket>C9A98D036ACCA10EE3E8BEB7FB7474B8</ticket>' +
      '</safety>' +
      '<serverbody>' +
        '<servername>CheckInvoiceImage</servername>' +
        '<services>' +
        '<service>' +
          '<serviceid>1</serviceid>' +
          '<checkkey>User_20171114101333</checkkey>' +
          '<checktype>4</checktype>' +
          '<invoicecode>042001600111</invoicecode>' +
        '</service>' +
        '</services>' +
      '</serverbody>' +
      '</params>'
      // 创建XMLHttpRequest对象
      var xhr = new XMLHttpRequest()
      // 打开连接
      xhr.open('post', '/CheckInvoice/services/AutoImageCenter.ws', true)
      // 设置数据类型
      xhr.setRequestHeader('content-type', 'text/xml;charset=utf-8')
      // xhr.setRequestHeader('SOAPAction', '111')
      xhr.setRequestHeader('SOAPAction', 'http://tempuri.org/')
      // 设置回调函数
      xhr.onreadystatechange = function () {
        // 判断是否发送成功和判断服务端是否响应成功
        console.log(xhr, xhr.status, xhr.readyState, xhr.responseText)
        if (xhr.readyState === 4 && xhr.status === 200) {
          // alert(xhr.responseText)
        }
      }
      // 组织SOAP协议数据
      var soapXML = xmlStr
      // alert(soapXML)
      // 发送数据
      xhr.send(soapXML)
    }

我这样写会报错

<?xml version="1.0" encoding="UTF-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><soapenv:Body><soapenv:Fault><faultcode>soapenv:Server.userException</faultcode><faultstring>org.xml.sax.SAXException: Bad envelope tag:  params</faultstring><detail><ns1:hostname xmlns:ns1="http://xml.apache.org/axis/">dev-214</ns1:hostname></detail></soapenv:Fault></soapenv:Body></soapenv:Envelope>

谁做过这种啊，求指导下