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JS判斷不能為空實(shí)例代碼

 更新時(shí)間：2013年11月26日 16:11:30   作者：  
這篇文章主要介紹了JS判斷不能為空實(shí)例代碼，有需要的朋友可以參考一下
復(fù)制代碼 代碼如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html"; charset="utf-8">
        <title>短信系統(tǒng)</title>
<script language="javascript">       
        function formcheck(){
            if(document.form.zhanghao.value==""){
                alert("號碼不能為空！");
                this.form1.zhanghao.focus();
                return false;
            }else if(document.form.email.value==""){
                alert("內(nèi)容不能為空！")
                this.form1.eamil.focus();
                return false;
            }else form1.submit(); 
}
        </script>
    </head>

    <body>
        <form name="form" method="post" action="sendmail.php" class="formg">
            <table>
                <h2>
                    <tr>
                        <th colspan="8" class="CTitle">發(fā)送短信</th>
                    </tr>
                </h2>

                <body>

                        <tr bgcolor="#eeeeee">
                            <td align="center">號&nbsp;&nbsp;&nbsp;碼:</td>
                            <td><textarea name="content" cols="80" rows="15" id="zhanghao" class="formh"></textarea></td>
                        </tr>
                        <tr bgcolor="#eeeeee">
                            <td align="center">內(nèi)&nbsp;&nbsp;&nbsp;容:</td>
                            <td><textarea name="content" cols="80" rows="15" id="email" class="formh"></textarea></td>
                        </tr>

                        <tr bgcolor="#eeeeee" align="center">
                <td height="25" colspan="2">
                    <input type="button" name="Submit" value="發(fā)&nbsp;送" class="button" onClick="javascript：formcheck();">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                    <input type="reset" name="Submit2" value="重&nbsp;置" class="button">
                </td>
                        </tr>
                </body>
            </table>
        </form>
    </body>
</html>

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