?? DOM? ?? ?? ? ???
?? DOM? ?? ?? ? ???
??: ?? DOM? ??(??) ??? ?? ??(html ??)?? ?????.
?? ???
nodeName: ?? ??.
nodeValue: ??? ????. ??? ???? ?? ?? ?? ???? ?? ????. nodeValue? ?? "?? ???"? ???? HTML ??? CSS ??? ??? ? ????.
firstChild: ? ?? ?? ?????.
lastChild: ??? ?? ?????.
childNodes: ??? ?? ?? ?????.
parentNode: ?? ?????.
?? ?? ??
document.firstChild
document.firstChild.lastChild
document.body
??? ??
setAttribute(name, value): ??? ??? ?????.
getAttribute(name): ?? ?? ?? ?????.
removeAttribute(name): ??? ??? ?????.
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>php.cn</title>
<script type="text/javascript">
window.onload = function(){
//查找body節(jié)點(diǎn)
var node_body = document.all.div1;
//查找img節(jié)點(diǎn)
var imgObj = node_body.firstChild;
//增加屬性
imgObj.setAttribute("src","https://img.php.cn/upload/course/000/000/009/580ae23c4a88a881.jpg");
imgObj.setAttribute("width","400");
imgObj.setAttribute("border","2");
imgObj.setAttribute("style","cursor:pointer;");
//刪除border屬性
imgObj.removeAttribute("border");
}
</script>
</head>
<body ><div id="div1"><img /></div></body>
</html>?? ??
document.createElement(tagName): ??? HTML ??, ?? ??
-
tagName: HTML ?? ??? ??? ?????. ?? ?? ??.
?: var imgObj = document.createElement("img")
parentNode.appendChild(childNode): ??? ??? ?? ??? ?????.
parentNode? ?? ??? ????, ?? ??? ??? ???? ???.
childNode? ?? ??? ?????.
?: document.body.appendChild(imgObj)
parentNode.removeChild(childNode): ?? ?? ??? ?? ??? ?????.
parentNode? ?? ??? ?????.
childNode? ??? ?? ??? ?????.
?: document.body.removeChild(imgObj)
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8" />
<title>php.cn</title>
<script >
//網(wǎng)頁加載完成后
window.onload = function(){
//創(chuàng)建一個(gè)<img>標(biāo)記
var imgObj = document.createElement("img");
//增加屬性
imgObj.setAttribute("src","/upload/course/000/000/009/580ae23c4a88a881.jpg");
imgObj.setAttribute("width","400");
//將創(chuàng)建的圖片節(jié)點(diǎn)，掛載到某個(gè)父節(jié)點(diǎn)下
document.body.appendChild(imgObj);
}
</script>
</head>
<body>
</body>
</html> 
