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(“li”)

<!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(){
            //获取id=ulTag的网页对象
            var ulObj = document.getElementById("question");
            //查找<ul>下的所有的<li>标记
            var arrObj = ulObj.getElementsByTagName("li");
            //给所有的<li>标记增加CSS效果
            for(var i=0;i<arrObj.length;i++)
            {
                //给每个<li>标记加style属性
                arrObj[i].style = "color:blue;font-size:24px;";
            }
        }
        </script>
    </head>
    <body >
        <ul id="question">
            <li>mac 中系统自带的apache 误删了怎么恢复</li>
            <li>CURL POST数据量过大，接收不到服务端的信息</li>
            <li>用了构造函数为什么这个还是2？</li>
            <li>cookies登录原理</li>
        </ul>
</html>

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<!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(){ //获取id=ulTag的网页对象 var ulObj = document.getElementById("question"); //查找<ul>下的所有的<li>标记 var arrObj = ulObj.getElementsByTagName("li"); //给所有的<li>标记增加CSS效果 for(var i=0;i<arrObj.length;i++) { //给每个<li>标记加style属性 arrObj[i].style = "color:blue;font-size:24px;"; } } </script> </head> <body > <ul id="question"> <li>mac 中系统自带的apache 误删了怎么恢复</li> <li>CURL POST数据量过大，接收不到服务端的信息</li> <li>用了构造函数为什么这个还是2？</li> <li>cookies登录原理</li> </ul> </html>

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HTML DOM method of accessing HTML elements

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