js报错不运行

<head>
    <title>Title</title>

    <script src="jquery.js"/>  错误原因是将此句改为<script src="jquery.js"></script>
    <script>

function jsonp() {

alert("*******");

$a.jax({

type: “get”,

url: “http://192.168.200.73/redis/jsonpredis?action=111&callback=?”,

processData: false,

datatype: “json”,

success: function (data) {

alert(data.lookerid);

             }
             });
        }
    </script>
</head>