Script:
  level: |-
    function execute(player, itemStack, slotIdentifier, limitString){
      var result = player.getLevel() >= limitString;
      if(!result){
            player.sendMessage("§c该槽位将在 §f"+limitString+" §c级解锁")
      }
      return result;
    }

这个是判断原版等级的，等级换成变量怎么写？

var level = PlaceholderAPI.static.setPlaceholders(player, '%player_level%')具体变量自行修改