以下解决方案，它利用 jQuery UI Autocomplete 就足够了-当然，根据您的特定要求，可能需要进一步调整.

The following solution, which utilises jQuery UI Autocomplete, should suffice - of course it might need some further tweaking depending on your specific requirements.

标记:

<input id="autocomplete"/>
<br />
<input id="submit" type="submit" disabled="disabled"/>

脚本:

var source = ['One', 'Two', 'Three', 'Four'];

$("input#autocomplete").autocomplete({
    source: source,
    select: function(event, ui) {
        $("#submit").removeAttr("disabled");
    }
}).keyup(function() {
    var $parentContext = $(this);
    var matches = $.grep(source, function(n, i) {
        return $parentContext.val().toLowerCase() == n.toLowerCase();
    });
    $("#submit").attr("disabled", !matches.length);
});

演示: http://jsfiddle.net/karim79/Ezbns/

进一步阅读:

• http://jqueryui.com/demos/autocomplete/
• http://api.jquery.com/jQuery.grep/

• http://jqueryui.com/demos/autocomplete/
• http://api.jquery.com/jQuery.grep/