AJAX 用户唯一性验证实现代码
用ajax实现用户名的检测，提示是否重复的实现代码。
从数据库my中的username用户表里验证：
checkusername.html：
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check_it.php：
$username = $_POST["username"];
$conn = mysql_connect("localhost:3306","root","123");
mysql_select_db("my",$conn);
$sql = "select * from username where username = '$username'";
$result = mysql_query($sql,$conn);
$num = mysql_fetch_array($result);
if($num > 0){
printf("can't use");
}
else{
printf("It can use");
}
?>
checkusername.html：
复制代码 代码如下:
check_it.php：
复制代码 代码如下:
$username = $_POST["username"];
$conn = mysql_connect("localhost:3306","root","123");
mysql_select_db("my",$conn);
$sql = "select * from username where username = '$username'";
$result = mysql_query($sql,$conn);
$num = mysql_fetch_array($result);
if($num > 0){
printf("can't use");
}
else{
printf("It can use");
}
?>
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