<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
    <head>
        <title>$</title>
        <script type="text/javascript" language="javascript"
         src="prototype.js" ></script>
        <script type="text/javascript" language="javascript">
        function test1() {
            var div = $("div1"); // 单个参数
            alert(div.innerHTML);
        }
        
        function test2() {
            var divs = $("div1", "div2"); // 多个参数
            for (var i = 0; i < divs.length; i++) {
                alert(divs[i].innerHTML);
            }
        }
        </script>
    </head>
    <body>
    <div id="div1">
        div1
    </div>
    <div id="div2">
        div2
    </div>
    <input type="button" value="click1" onclick="test1()" />
    <input type="button" value="click2" onclick="test2()" />
    </body>
</html>