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javascript中级--DOM元素的创建、插入、删除

一、创建DOM元素

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script>
        window.onload = function() {
            var oBtn = document.getElementById(‘btn1‘);
            var oUl = document.getElementById(‘ul1‘);
            oBtn.onclick = function() {
                var oLi = document.createElement(‘li‘); //创建一个元素
                oUl.appendChild(oLi); //把li插入到父级

            }
        }
    </script>
</head>

<body>
    <input id="btn1" type="button" name="" value="http://www.mamicode.com/创建li">
    <ul id="ul1"></ul>

    </ul>
</body>

</html>

 二、插入DOM元素

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script>
        window.onload = function() {
            var oBtn = document.getElementById(‘btn1‘);
            var oUl = document.getElementById(‘ul1‘);
            var oTxt = document.getElementById(‘txt1‘);
            oBtn.onclick = function() {
                var oLi = document.createElement(‘li‘); //创建一个元素
                var aLi = document.getElementsByTagName(‘li‘);
                oLi.innerHTML = oTxt.value;
                if (aLi.length == 0) {
                    oUl.appendChild(oLi); //把li插入到父级后面
                } else {
                    oUl.insertBefore(oLi, aLi[0]); //把li插入到aLi[0]前面
                }
                oTxt.valuehttp://www.mamicode.com/= "";
            }
        }
    </script>
</head>

<body>
    <input id="txt1" type="text">
    <input id="btn1" type="button" name="" value="http://www.mamicode.com/插入">
    <ul id="ul1"></ul>

    </ul>
</body>

</html>

 三、删除DOM元素

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script>
        window.onload = function() {
            var aA = document.getElementsByTagName(‘a‘);
            var oUl = document.getElementById(‘ul1‘);
            var i = 0;
            for (i = 0; i < aA.length; i++) {
                aA[i].onclick = function() {
                    oUl.removeChild(this.parentNode); //删除
                }
            }
        }
    </script>
</head>

<body>
    <ul id="ul1">
        <li>asdfasdf
            <a href="javascript:;">删除</a>
        </li>
        <li>123
            <a href="javascript:;">删除</a>
        </li>
        <li>xcvx
            <a href="javascript:;">删除</a>
        </li>
    </ul>
</body>

</html>

 

javascript中级--DOM元素的创建、插入、删除