<div class="header-search">
      <form id="form" action="http://m.baidu.com/s" method="get" accept-charset="utf-8" class="clearfix" autocomplete="off">
        <a>
          <span class="search-media"></span>
        </a>
        <input id="searchData" type="text" placeholder="搜索一下" name="word" @keyup="listenWords" @input="listenInput" @focus="listenInput" />
        <span class="del">×</span>
        <a @click="gotoSearch">
          <span class="icon-search icon-sign"></span>
        </a>
      </form>
    </div>
    <div id="pagesZone" class="clearfix">
      <div id="auto"></div>
      <span class="engi">快速搜索：</span>
      <img src="/UploadFiles/2021-04-02/google.png">



fillUrls: function() {
        var that = this;
        var strdomin = document.getElementById("searchData").value;
        window.status = "请求中";
        this.$http.jsonp("http://suggestion.baidu.com/su", {  //请求参数
          params: {
           wd: strdomin
          },
          jsonp: 'cb'
        }).then(function(res){
          window.status = "请求结束";
          that.autoDisplay(JSON.parse(res.body).s);
        },function(){
          console.log("error");
        });
      },

      autoDisplay: function(autoStr) {
        var searchText = document.getElementById('searchData');
        var autoNode = document.getElementById('auto'); //缓存对象（弹出框）
        var that = this;
        var docWidth = document.body.clientWidth || document.documentElement.clientWidth;
        var pagesZone = document.getElementById('pagesZone');
        if (autoStr.length == 0) {
          console.log("false");
          autoNode.style.display = "none";
          return false;
        }
        autoNode.innerHTML = "";
        for (var i = 0; i < autoStr.length; i++) {
          //创建节点
          var wordNode = autoStr[i].replace(searchText.value,"<b>"+searchText.value+"</b>");
          var newDivNode = document.createElement('div');
          newDivNode.setAttribute("id",i);
          autoNode.appendChild(newDivNode);
          var wordSpanNode = document.createElement('span');
          wordSpanNode.setAttribute('class','suggText');
          wordSpanNode.innerHTML = wordNode;
          newDivNode.appendChild(wordSpanNode);
          var addNode = document.createElement('span');
          addNode.setAttribute('class','addText');
          addNode.innerHTML = '+';
          newDivNode.appendChild(addNode);
          //鼠标点击文字上屏并搜索
          wordSpanNode.onclick = function () {
            this.highlightindex = this.parentNode.getAttribute('id');
            var comText = autoNode.childNodes[this.highlightindex].firstChild.innerText;
            autoNode.style.display = "none";
            this.highlightindex = -1;
            searchText.value = comText;
            pagesZone.style.display = "none";
            that.gotoSearch();
          };
          //鼠标点击文字上屏
          addNode.onclick = function () {
            this.highlightindex = this.parentNode.getAttribute('id');
            var comText = autoNode.childNodes[this.highlightindex].firstChild.innerText;
            autoNode.style.display = "none";
            this.highlightindex = -1;
            searchText.value = comText;
          };
          //展示
          if (autoStr.length > 0) {
            autoNode.style.display = "block";
          } else {
            autoNode.style.display = "none";
            this.highlightindex = -1;
          }
          //针对手机竖屏时的显示条数控制
          if (docWidth < 500 && i > 3) {
            break;
          }
        }
      },

      close: function() {
        document.getElementById('pagesZone').style.display = 'none';
      },

      listenWords: function(event) {
        console.log("listen keyup");
        var that = this;
        var searchInput = document.getElementById("searchData");
        event = window.event || event;
        if (event.keyCode == 13) {   // enter
          event.preventDefault();
          that.gotoSearch();
        }
        if (event.keyCode == 8) {   // backspace
          console.log(searchInput.value.length);
          if(searchInput.value.length == 0){
            searchInput.blur();
            searchInput.focus();
          }
        }
      },

      listenInput: function() {
        var that = this;
        var searchInput = document.getElementById("searchData");
        var auto = document.getElementById('auto');
        var pagesZone = document.getElementById('pagesZone');
        var del = document.getElementsByClassName('del')[0];
        if (searchInput.value == null || searchInput.value == "") {
          auto.innerHTML = "";
          pagesZone.style.display = "none";
          del.style.display = "none";
          auto.style.display = "none";
          return;
        }
        pagesZone.style.display = "block";
        del.style.display = "block";
        that.fillUrls();
        if (this.highlightindex != -1) {
          this.highlightindex = -1;
        }
      },




多引擎搜索很简单，匹配对应参数就好：
window.location.href = "https://m.zhihu.com/search" + document.getElementById("searchData").value;


百度：https://m.baidu.com/s"external nofollow" href="https://www.google.com/search">https://www.google.com/search"external nofollow" href="https://cn.bing.com/search">https://cn.bing.com/search"external nofollow" href="https://m.zhihu.com/search">https://m.zhihu.com/search"external nofollow" href="http://wap.sogou.com/web/searchList.jsp">http://wap.sogou.com/web/searchList.jsp"external nofollow" href="http://so.m.jd.com/ware/search.action">http://so.m.jd.com/ware/search.action"htmlcode">

var strdomin = document.getElementById("searchData").value;
        window.status = "请求中";
        this.$http.jsonp("http://suggestion.baidu.com/su", {  //请求参数
          params: {
           wd: strdomin
          },
          jsonp: 'cb'
        }).then(function(res){
          window.status = "请求结束";
          that.autoDisplay(JSON.parse(res.body).s);
        },function(){
          console.log("error");
        });



输入框中有文字的时候触发。
其中JSON.parse用于从一个字符串中解析出json对象。s是suggest words。这里传到autoDisplay的参数即关键字提示。
另外将input元素的autocomplete属性设置为off可以关闭自动提示：


<input type="text" name="name" autocomplete="off">



如果所有表单元素都不想使用自动提示功能，只需在表单form上设置autocomplete=off。
最后将获取到的关键字提示放到input下面的节点中即可。
注意：
复制代码 代码如下:<input id="searchData" type="text" placeholder="搜索一下" name="word" @keyup="listenWords" @input="listenInput" @focus="listenInput" />


这里因兼容问题绑定了3个事件，其中listenWords专门针对手机键盘的回车键和回退键：


listenWords: function(event) {
        console.log("listen keyup");
        var that = this;
        var searchInput = document.getElementById("searchData");
        event = window.event || event;
        if (event.keyCode == 13) {   // enter
          event.preventDefault();
          that.gotoSearch();
        }
        if (event.keyCode == 8) {   // backspace
          console.log(searchInput.value.length);
          if(searchInput.value.length == 0){
            searchInput.blur();
            searchInput.focus();
          }
        }
      },



如有更好的方式欢迎讨论。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。