How do I force no cache to be used for javascript-wx.request request results?

{Code ...} php: {code ...} when {code ...} {code...} is returned ...} when {code ...} {code...} is returned ...} modify {code...} again ...} compile, clear cache, restart and return {code ...} what is the situation?

 wx.request({  url: 'wxapp.php',  data: {     x: '12' ,     y: '34'  },  header: {      'Content-Type': 'application/json'  },  success: function(res) {    console.log(res.data)  }})

Php:

  $x,'y'=>$y];echo json_encode($z);

When

      data: {         x: '12' ,         y: '34'      }

Return

1234

When

      data: {         x: '123' ,         y: '343'      }

Return

Object {x: "123", y: "343"}

Modify again

      data: {         x: '12' ,         y: '34'      }

Compile, clear cache, restart
Return

1234

What is the situation?

Reply content:

 wx.request({  url: 'wxapp.php',  data: {     x: '12' ,     y: '34'  },  header: {      'Content-Type': 'application/json'  },  success: function(res) {    console.log(res.data)  }})

Php:

  $x,'y'=>$y];echo json_encode($z);

When

      data: {         x: '12' ,         y: '34'      }

Return

1234

When

      data: {         x: '123' ,         y: '343'      }

Return

Object {x: "123", y: "343"}

Modify again

      data: {         x: '12' ,         y: '34'      }

Compile, clear cache, restart
Return

1234

What is the situation?

Wx. request ({url: 'wxapp. php ', data: {x: '12', y: '34', _: (new Date ()). getTime () // add a random parameter}, header: {'content-type': 'application/json'}, success: function (res) {console. log (res. data )}});