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  • javascript: with 表单验证

    <html>

    <head>

    <script type="text/javascript">

    function validate_required(field,alerttxt)

    {

    with (field)

      {

      if (value==null||value=="")

        {alert(alerttxt);return false}

      else {return true}

      }

    }

    function validate_form(thisform)

    {

    with (thisform)

      {

      if (validate_required(email,"Email must be filled out!")==false)

        {email.focus();return false}

      }

    }

    </script>

    </head>

    <body>

    <form action="submitpage.htm" onsubmit="return validate_form(this)" method="post">

    Email: <input type="text" name="email" size="30">

    <input type="submit" value="Submit">

    </form>

    </body>

    </html>

    补充:

      with (object) 
           statements

    例:

    x = Math.cos(3 * Math.PI) + Math.sin(Math.LN10) 
    y = Math.tan(14 * Math.E) 
          当使用 with 语句时: 
       with (Math){ 
       x = cos(3 * PI) + sin (LN10)  
       y = tan(14 * E) 
     } 

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  • 原文地址:https://www.cnblogs.com/refe/p/4918120.html
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