奇怪的。来自远程json的自动完成数据

Question

<script type="text/javascript">
$('.search').autocomplete({
    delay: 500,
    minLength: 3,
    source: function(request, response) {
        $.getJSON('/rest.json', { q: request.term }, function(result) {
            response($.map(result, function(item) {
                return {label:item.label, searchLink:item.searchLink};
            }));
        });
    },
     select:function(e,ui) { location.href = ui.item.searchLink; }
});
</script>

使用此代码.autocomplete工作有些奇怪：它显示来自json数据的所有行。 Json内容：

[{"label":"link to find 1", "searchLink":"http://blala.xom"},
{"label":"link to find 2", "searchLink":"http://blala.xom"},
{"label":"link to find 3", "searchLink":"http://blala.xom"}]

结果是下一个： ResultImage