javascript代码理解

来源:互联网 发布:淘宝流量钱包怎么开通 编辑:程序博客网 时间:2024/06/06 18:41
<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>
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