怎么在js实现类似百度的自动补全功能。

jquery ui 有一个autocomplete的插件，可以实现这个功能  在后台传一个 json格式的数组数据过来。JS如下：

$(function() { 
var cache = {}; 
    function split( val ) { 
      return val.split( /,\s*/ ); 
    } 
    function extractLast( term ) { 
      return split( term ).pop(); 
    } 
  
    $( "#tags" ) 
      // don't navigate away from the field on tab when selecting an item 
      .bind( "keydown", function( event ) { 
        if ( event.keyCode === $.ui.keyCode.TAB && 
            $( this ).data( "ui-autocomplete" ).menu.active ) { 
          event.preventDefault(); 
        } 
      }) 
      .autocomplete({ 
        minLength: 1, 
        source: function (request, response) { 
         var term = request.term; 
            if ( term in cache ) { 
              response( cache[ term ] ); 
              return; 
            } 
            $.ajax({ 
                type: "POST", 
                url: mlog.variable.base+"/admin/post/autocomplete?keyword=" +  extractLast( request.term ) , 
                contentType: "application/json; charset=utf-8", 
                dataType: "json", 
                success: function (data) { 
                 cache[ term ] = $.map(data, function(item){ 
         return item.name 
         }); 
                 response( $.ui.autocomplete.filter( 
                 $.map(data, function(item){ 
                 return item.name 
                 }), extractLast( request.term ) ) ); 
                }, 
                error: function () { 
                    alert("补全失败"); 
                } 
            }); 
}, 
        focus: function() { 
          // prevent value inserted on focus 
          return false; 
        }, 
        select: function( event, ui ) { 
          var terms = split( this.value ); 
          terms.pop(); 
          terms.push( ui.item.value ); 
          terms.push( "" ); 
          this.value = terms.join( ", " ); 
          return false; 
        } 
      }); 
  }); 

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<link rel="stylesheet" type="text/css" href="/script/jquery-ui/themes/base/jquery.ui.all.css">