HTML DOM method of accessing HTML elements
getElementById()
Function: Find the element object with the specified id in the web page.
Syntax: var obj = document.getElementById(id)
Parameters: id refers to the value of the id attribute marked in the web page.
Return value: Returns an element object.
Example: var imgObj = document.getElementById(“img01”)
getElementsByTagName(tagName)
- ##Function: Find the specified HTML tag and return an array.
- Syntax: var arrObj = parentNode.getElementsByTagName(tagName)
- Parameters: tagName is the tag name to be found, without angle brackets.
- Return value: Returns an array. If there is only one node, an array is also returned.
- Example: var arrObj = ulObj.getElementsByTagName(“l(fā)i”)
<!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(){
//獲取id=ulTag的網(wǎng)頁(yè)對(duì)象
var ulObj = document.getElementById("question");
//查找<ul>下的所有的<li>標(biāo)記
var arrObj = ulObj.getElementsByTagName("li");
//給所有的<li>標(biāo)記增加CSS效果
for(var i=0;i<arrObj.length;i++)
{
//給每個(gè)<li>標(biāo)記加style屬性
arrObj[i].style = "color:blue;font-size:24px;";
}
}
</script>
</head>
<body >
<ul id="question">
<li>mac 中系統(tǒng)自帶的apache 誤刪了怎么恢復(fù)</li>
<li>CURL POST數(shù)據(jù)量過大，接收不到服務(wù)端的信息</li>
<li>用了構(gòu)造函數(shù)為什么這個(gè)還是2？</li>
<li>cookies登錄原理</li>
</ul>
</html> 
