1-5选项删除添加

<p><input type="text" placeholder="添加品牌" id="input"><button id="btn">添加</button></p>
    <ul id="parent">
        <li><span>小米</span><a href="#">删除</a></li>
        <li><span>苹果</span><a href="#">删除</a></li>
        <li><span>华为</span><a href="#">删除</a></li>
    </ul>
    <script>
        var parent = document.getElementById("parent");
        var input = document.getElementById("input");
        var btn = document.getElementById("btn");
        btn.onclick = function(){
            var value = input.value;
            var li = document.createElement("li");
            var span = document.createElement("span");
            span.innerHTML = value;
            li.appendChild(span);
            var a = document.createElement("a");
            a.href = "#";
            a.innerHTML = "删除"
            li.appendChild(a);
            parent.appendChild(li);
            input.value = ""
        }
        var deletes = document.getElementsByTagName("a");
        for(var i=0;i<deletes.length;i++){
            deletes[i].onclick = function(){
                var parentNode = this.parentNode;
                parentNode.style.display = "none";
                return false;
            }
        }
    </script>