HBuilder开发app ajax跨域 解决XMLHttpRequest

<div id="a1" onclick="testXHR()" style="font-size: 5em;">sss1</div>

  <script type="text/javascript">

        var url = ‘http://192.168.0.122/lxty/index.php/index/index/testajax‘;

          var data;

          var xhr=null;          

          function testXHR(){

              if(xhr){

                  return;

              }

              xhr=new plus.net.XMLHttpRequest();

              xhr.onreadystatechange=xhrStatechange;

              xhr.open( "GET", url);

              xhr.send();

          }

          function xhrStatechange(){

              if (xhr.readyState==4&&xhr.status == 200) {

                      data = JSON.parse(xhr.responseText);

                      //alert(data.a1)   

                      for(i in data){alert(data[i])}

              }

          }

</script>