第一种方法

 var bdkeyword = "";
    $(".indexSearch input").keyup(function (e) {
        if (e.keyCode == 13) {
            window.open($(".indexSearch .btn").attr("href"), "_blank");
        } else {
            $(".indexSearch .btn").attr("href", "https://www.baidu.com/s?ie=utf-8&wd=" + $(this).val());
        }
    });
    var keyword = "";
    $(".indexSearch input").bind("input", function (e) {
        var that = $(this);
        if (keyword != that.val()) {
            var text = that.val();
            $.ajax({
                url: "https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su?wd=" + text + "&cb=getvalue",
                dataType: "jsonp",
                type: "post",
                jsonp: "cb",
                success: function (data) {
                    if (data) {
                        laytpl($("#keywordList").html()).render(data, function (html) {
                            if (html.trim() != "") {
                                $(".selectul").show().html(html);
                            } else {
                                $(".selectul").hide().html("");
                            }
                        });
                    }
                },
                error: function (err) {
                }
            });
        }
    });

直接调用百度接口然后输出数据到

<script id="keywordList" type="text/html">
    {{#layui.each(d.s, function(index, item){}}
    <li>
        <a href="/go/?url=https://www.baidu.com/s?ie=utf-8&wd={{item}}" class="target" rel="external nofollow" target="_blank">{{item}}</a>
    </li>
    {{#})}}
</script>

第二种是自己写一个api接口 PHP代码如下

<?php
$word=$_GET["wd"];
$html = getArray($word);
$res = getHtmlByContent($html);
$result = array('p'=>'false','q'=>$word,'s' =>$res);
echo json_encode($result);
/**
 * getHtmlByContent 
 * 
 * @param mixed $html 
 * @access public
 * @return void
 */
function getHtmlByContent($html){
    preg_match_all('/<table cellpadding="0">.*<\/table>/',$html,$res);
//  print_r($res[0][0]);
    preg_match_all('/<th>.*?<\/th>/',$res[0][0],$result);
    $result = $result[0];
    if(!empty($result) && is_array($result)){
        foreach($result as $k=>$v){
            $result[$k] = strip_tags($v);
        }   
    }   
    //print_r($result);
    return $result;
}


/**
 * getArray 
 * 
 * @param mixed $kw 
 * @access public
 * @return void
 */
function getArray($kw){
    $url="http://www.baidu.com/s?wd=".$kw;
    $curl=curl_init();
    curl_setopt($curl,CURLOPT_URL,$url);
    curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
    //curl_setopt($curl, CURLOPT_POSTFIELDS, $curlPost);
    $data = curl_exec($curl);
    $data = preg_replace("/[\r\n\t]+/","",$data);
    return $data;

}

服务器配置差的情况下 方法1明显快于方法二