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[Java教程]邮箱格式验证demo


<html><head><script type="text/javascript">  function validate_email(field, alerttxt) {    with (field) {      apos = value.indexOf("@")      dotpos = value.lastIndexOf(".")      if (apos < 1 || dotpos - apos < 2) {        alert(alerttxt);        return false       }      else {        return true       }    }  }  function validate_form(thisform) {    with (thisform) {      if (validate_email(email, "Not a valid e-mail address!") == 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>