$()方法

$() 方法是在DOM中使用过于频繁的 document.getElementById() 方法的一个便利的简写

<title>
    Test Page
</title>

<script>
            function test1() {
                var d = $('myDiv');
                alert(d.innerHTML);
            }
            function test2() {
                var divs = $('myDiv', 'myOtherDiv');
                for (i = 0; i < divs.length; i++) {
                    alert(divs[i].innerHTML);
                }
            }
        </script>
<div id="myDiv">
    <p>
        This is a paragraph
    </p>
</div>
<div id="myOtherDiv">
    <p>
        This is another paragraph
    </p>
</div>
<input type="button" value="Test1" onclick="test1();" /> <br />
<input type="button" value="Test2" onclick="test2();" /> <br />