调用之间函数中的持久化数据？

var track = 0;
$.getJSON('songsMetadata.json', function(data){
    appendData(data);
});
player.bind("ended", function(){
    track++
    appendData();
});
function appendData(data){
    /* Here I want to populate 
     the inside 'data' argument 
    only once (in the callback of 
    getJSON) and use that same
    data in the 'player.bind' 
    callback */

    //Some code to append data[track] to an HTML list
}

function enclose(func) {
 let args = [];
 return function (...passed) {
   if(passed.length) args = passed;
   func(...args);
 };
}

const log = enclose(console.log.bind(console));
log(5,1);
log();