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="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.value = "";
}
}
</script>
</head>
<body>
<input id="txt1" type="text">
<input id="btn1" type="button" name="" value="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>
