9.26 DOM基础练习

DOM实例

<style>
            #s1 {
                width: 100px;
            }
        </style>
    </head>

    <body>
        <select id="s1" size="7">                             

        </select>
        <input id="txt1" type="text" />
        <input id="btn1" type="button" value="提交" />
        <input id="btn2" type="button" value="删除" />
    </body>

</html>
<script>
    var s1 = document.getElementById("s1");
    var txt1 = document.getElementById("txt1");
    var btn1 = document.getElementById("btn1");
    var btn2 = document.getElementById("btn2");

    btn1.onclick = function() {
//        字符串拼接方法
//        s1.innerHTML += "<option>" 
//                        + txt1.value 
//                        + "</option>";
//        造对象方法
        var opt = document.createElement('option');
        opt.innerText = txt1.value;
        s1.appendChild(opt);
        
        txt1.value = '';
    }
    
    btn2.onclick = function(){
//        s1.selectedIndex
//        s1.selectedOptions[0]
//        appendChild
//        removeChild
        s1.removeChild(s1.selectedOptions[0]);
    }
</script>

 

posted @ 2017-09-26 19:58  sistrong  阅读(96)  评论(0)  编辑  收藏  举报