当我专注于输入标签时，移动键盘会向上移动

Question

HTML

<?php
    $API_KEY="AAAAoyz8W_Q:APA91bFIJxTqoBnQo218QIIXi7uCmHFRP604RTC......";
    $url = "https://fcm.googleapis.com/fcm/send";
    $headers = array(
            'Authorization:key='.$API_KEY,
            'Content-Type:application/json'
    );

    $token="2tJfPjKZQ6UTVG....";
    $notify=array("message"=>
                        array('token' =>$token,
                              'notification'=>array('title'=>"Title",
                              'body'=>"Body")));

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST,true );
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($notify));

    $result = curl_exec($ch);
    if ($result === FALSE) {
        die('Curl failed: ' . curl_error($ch));
    }else{
        echo $ch;
    }
    curl_close ( $ch );

?> 

JS

<input id="inputText" type="text" />

打开“我的页面”时，我想通过重点关注document.getElementById('inputText').focus(); 标签来显示移动键盘。