javascript练习:813选择与改变事件

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>New Web Project</title>
        <script language="javascript">
            function strCon(str)//连接字符串
            {
                if(str!="请选择")
                {
                    form1.text.value = "你选择的是 "+str;
                }    
                else
                {
                    form1.text.value = "";
                }
            }
        </script>
    </head>
    <body>
        <form name="form1" id="form1" method="post" action=""><!--表单-->
            <label>
                <textarea name="text" cols="50" rows="10" onselect="alert('你行复制吗?');"></textarea>
                <p>
                    <select name="select1" onchange="strCon(this.value)">
                        <option value="请选择">请选择</option>
                        <option value="北京">北京</option>
                        <option value="广州">广州</option>
                        <option value="上海">上海</option>
                    </select>
                </p>
            </label>
        </form>
    </body>
</html>
原文地址:https://www.cnblogs.com/KeenLeung/p/2993230.html