<span><span> 1</span> <span>var</span> user = form.name.<span>value; </span><span> 2</span> <span>var</span> password = form.password.<span>value; </span><span> 3</span> <span>var</span> url = "chkname.php?user="+user+"&password="+password;<span>//</span><span>以前只知道ajax用于对用户名的检测,原来还可以对密码进行检测。</span> <span> 4</span> xmlhttp.open("GET",url,<span>true</span><span>); </span><span> 5</span> xmlhttp.onreadystatechange = <span>function</span><span>(){ </span><span> 6</span> <span>if</span>(xmlhttp.readyState == 4<span>){ </span><span> 7</span> <span>var</span> msg = xmlhttp.<span>responseText; </span><span> 8</span> <span>if</span>(msg == '1'<span>){ </span><span> 9</span> alert('用户名或密码错误!!'<span>); </span><span>10</span> form.password.<span>select(); </span><span>11</span> form.check.value = ''<span>; </span><span>12</span> <span> code(form); </span><span>13</span> <span>return</span> <span>false</span><span>; </span><span>14</span> }<span>if</span>(msg == "3"<span>){ </span><span>15</span> alert("用户名被占用,请重新输入!"<span>); </span><span>16</span> <span>return</span> <span>false</span><span>; </span><span>17</span> }<span>else</span><span>{ </span><span>18</span> alert('欢迎光临'<span>); </span><span>19</span> location.<span>reload(); </span><span>20</span> <span> } </span><span>21</span> <span> } </span><span>22</span> <span> } </span><span>23</span> xmlhttp.send(<span>null</span><span>); </span><span>24</span> <span>return</span> <span>false</span>;</span>
最初のステップには jq js ファイルが必要です
< ;html>
Ajax については知っていますが、JSP については半分しか経験がありません。