问按一下jQuery从php文件加载值到html输入-不起作用

EN

<?php
$filename = "num.txt";
$file = fopen("num.txt","r+");
$number = fread($file, filesize($filename));
fclose($file);
?>

<div class="on"><input type="text" id ="omlat" class="inv-number" value="<?php echo $number;?>"></input></div>

$(document).ready(function(){
$(".reloadpg").click(function(){
$(".on").load("http://localhost/einvoice/inum.php");  
});
});

<?php
header("Cache-Control: no-cache");
$filename = "num.txt";
$file = fopen("num.txt","r+");
$number = fread($file, filesize($filename));
$number = $number + 1;  //the new number to proceed
file_put_contents('num.txt', $number);
echo $number;
fclose($file);
?>

$('.create-invoice').on('click',function()
{   
   //Below is the code i added from the first problem above its not working here.. when it was alone outside this function as the accepted answer it will work but it will stop this function from working!
         $.get( "/einvoice/inum.php", function(data) {
        $('.inv-number').val(data);
    });
 //Above is the code i added from the first problem..
//below is the original code for the function, keep in mind only the below code is bing excited     the above is not.. its not refreshing the part of the page it should its calling the php script successfully tho, but i will have to refresh the page my self to see the number updated  
    grab_invoice_data();
    // Declare a variable
    var jsonObj = invoice_data;

    // Lets convert our JSON object
    var postData = JSON.stringify(jsonObj);

    // Lets put our stringified json into a variable for posting
    var postArray = {json:postData};

    $.download("php/json.php", postArray, 'post');

    //if cookie exists
    var i_n = $('.inv-number').val();
    $.cookie('lid', ++i_n, { expires: 365 } ); 
    //invoices created
    if( $.cookie('ic') ){
    var ck_inv_created = ($.cookie('ic'));
    $.cookie('ic', (++ck_inv_created));
    } else {
    $.cookie('ic', ++inv_created);
    }
})