text: /**
   * Created by jinshengjie on 2016/11/3.
   *
   * =======================================
   * Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.
   * For example,
   * Given 1->2->3->3->4->4->5, return 1->2->5.
   * Given 1->1->1->2->3, return 2->3.
   * =======================================
   */
  
  function ListNode(val) {
  	this.val = val;
  	this.next = null;
  }
  
  let deleteDuplicates;
  
  deleteDuplicates = function (head) {
  	if(head == null || head.next == null){
  		return head;
  	}
  
  
  };