1,ajax分为$.ajax(),$.get(),$.post(),$.getJSON() 几种形式,实例如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | <html><meta http-equiv="Content-Type" content="text/html;charset=utf-8"><script type="application/javascript" src="../js/jquery-1.7.2.js"></script><script type="application/javascript">$(document).ready(function(){ $("#ajaxBut").click(function(){ $.ajax({ 'type':'get', 'url':'test4.php', 'dateType':'json', 'data':$("input").serialize(), 'success':function(ret){ alert(ret); } }); }); $("#getBut").click(function(){ $.get("test4.php",$("input").serialize(),function(ret){ alert(ret); }); }); $("#postBut").click(function(){ $.post("test5.php",$("input").serialize(),function(ret){ alert(ret); }); }); $("#jsonBut").click(function(){ $.getJSON("test4.php",$("input").serialize(),function(ret){ alert(ret); }); });});</script><body><form> <h1>user Login</h1> username:<input type="text" name="user" id="user" /><br/> password:<input type="password" name="password" id="password"/><br/> <input type="button" name="but" id = "ajaxBut" value="ajaxLogin" /> <input type="button" name="but" id = "postBut" value="postLogin" /> <input type="button" name="but" id = "getBut" value="getLogin" /> <input type="button" name="but" id = "jsonBut" value="jsonLogin" /></form></body></html> |
test4.php
1 2 3 4 5 6 7 8 | <?php$username = $_GET['user'];$password = $_GET['password'];$ret = "fail";if($username == 'zhangsan' && $password == '123'){ $ret = "success";}echo json_encode($ret); |
test5.php
1 2 3 4 5 6 7 8 | <?php$username = $_POST['user'];$password = $_POST['password'];$ret = "fail";if($username == 'zhangsan' && $password == '123'){ $ret = "success";}echo json_encode($ret); |
2,ajax跨域获取数据,使用到jsonp,实例如下:
1 2 3 4 5 | $.getJSON("http://www.ganji.com/test6.php?callback=?", $("input").serialize() , function(data){ if(data){ console.log(data); }}); |
test6.php
1 2 3 4 5 6 7 8 9 | $str = 'OK';$callback = $_GET('callback'); if (!empty($callback)) { header("content-type: application/x-javascript; charset=UTF-8"); echo $callback . '(' . $str . ')'; } else { echo $str; }} |

本文通过具体示例介绍了Ajax的各种形式(如$.ajax()、$.get()、$.post()等)及其在用户登录验证中的应用,并展示了如何利用JSONP实现Ajax跨域数据获取。
297

被折叠的 条评论
为什么被折叠?



