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javascript积累

1. 某个ID的元素是否存在
 if(window.document.getElementById('someCtl')!=null)
    { 
        window.document.getElementById('tmenu').style.display =  ""; 
    }
    else
    {
        window.document.getElementById('tmenu').style.display =  "none"; 
    }

 

2.日期比较

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script language="javascript">
    function check()
    {
        try
        {
            var strdt1=document.getElementById("dt1").value.replace("-","/");
            var strdt2=document.getElementById("dt2").value.replace("-","/");            
            var dt1=new Date(Date.parse(strdt1));
            var dt2=new Date(Date.parse(strdt2));
            alert(dt1>dt2);
        }
        catch(e)
        {
            alert("格式错误"+e);
        }
    }
</script>
</head>

<body>
<form onSubmit="return check();">
<input name="dt1" id="dt1"  value="2007-9-9" />
<input name="dt2" id="dt2" value="2007-10-10"/>
<input type="submit" value="提交" />
</form>
</body>
</html>

3.javascript读取select中选择项的value值 
document.form1.select1.options[document.form1.select1.selectedIndex].value 

posted on 2007-12-19 08:33  厦门刀客  阅读(222)  评论(0)    收藏  举报

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