新建index.html文件，直接复制下面代码到新建的文件index.html里面，用浏览器访问，仅用于参考:
<!doctype html><html><meta charset="utf-8"><style>body {margin-left: 0px;margin-top: 0px;margin-right: 0px;margin-bottom: 0px;}.auto_hidden {width:204px;border-top: 1px solid #333;border-bottom: 1px solid #333;border-left: 1px solid #333;border-right: 1px solid #333;position:absolute;display:none;}.auto_show {width:204px;border-top: 1px solid #333;border-bottom: 1px solid #333;border-left: 1px solid #333;border-right: 1px solid #333;position:absolute;z-index:9999; /* 设置对象的层叠顺序 */display:block;}.auto_onmouseover{color:#ffffff;background-color:highlight;width:100%;}.auto_onmouseout{color:#000000;width:100%;background-color:#ffffff;}</style><script language="javascript"><!--var $ = function (id) {return "string" == typeof id ? document.getElementById(id) : id;}var Bind = function(object, fun) {return function() {return fun.apply(object, arguments);}}function AutoComplete(obj,autoObj,arr){this.obj=$(obj); //输入框this.autoObj=$(autoObj);//DIV的根节点this.value_arr=arr; //不要包含重复值this.index=-1; //当前选中的DIV的索引this.search_value=""; //保存当前搜索的字符}AutoComplete.prototype={//初始化DIV的位置init: function(){this.autoObj.style.left = this.obj.offsetLeft + "px";this.autoObj.style.top = this.obj.offsetTop + this.obj.offsetHeight + "px";this.autoObj.style.width= this.obj.offsetWidth - 2 + "px";//减去边框的长度2px},//删除自动完成需要的所有DIVdeleteDIV: function(){while(this.autoObj.hasChildNodes()){this.autoObj.removeChild(this.autoObj.firstChild);}this.autoObj.className="auto_hidden";},//设置值setValue: function(_this){return function(){_this.obj.value=this.seq;_this.autoObj.className="auto_hidden";}},//模拟鼠标移动至DIV时，DIV高亮autoOnmouseover: function(_this,_div_index){return function(){_this.index=_div_index;var length = _this.autoObj.children.length;for(var j=0;j<length;j++){if(j!=_this.index ){_this.autoObj.childNodes[j].className='auto_onmouseout';}else{_this.autoObj.childNodes[j].className='auto_onmouseover';}}}},//更改classnamechangeClassname: function(length){for(var i=0;i<length;i++){if(i!=this.index ){this.autoObj.childNodes[i].className='auto_onmouseout';}else{this.autoObj.childNodes[i].className='auto_onmouseover';this.obj.value=this.autoObj.childNodes[i].seq;}}},//响应键盘pressKey: function(event){var length = this.autoObj.children.length;//光标键"↓"if(event.keyCode==40){++this.index;if(this.index>length){this.index=0;}else if(this.index==length){this.obj.value=this.search_value;}this.changeClassname(length);}//光标键"↑"else if(event.keyCode==38){this.index--;if(this.index<-1){this.index=length - 1;}else if(this.index==-1){this.obj.value=this.search_value;}this.changeClassname(length);}//回车键else if(event.keyCode==13){this.autoObj.className="auto_hidden";this.index=-1;}else{this.index=-1;}},//程序入口start: function(event){if(event.keyCode!=13&&event.keyCode!=38&&event.keyCode!=40){this.init();this.deleteDIV();this.search_value=this.obj.value;var valueArr=this.value_arr;valueArr.sort();if(this.obj.value.replace(/(^/s*)|(/s*$)/g,'')==""){ return; }//值为空，退出try{ var reg = new RegExp("(" + this.obj.value + ")","i");}catch (e){ return; }var div_index=0;//记录创建的DIV的索引for(var i=0;i<valueArr.length;i++){if(reg.test(valueArr[i])){var div = document.createElement("div");div.className="auto_onmouseout";div.seq=valueArr[i];div.onclick=this.setValue(this);div.onmouseover=this.autoOnmouseover(this,div_index);div.innerHTML=valueArr[i].replace(reg,"<strong>$1</strong>");//搜索到的字符粗体显示this.autoObj.appendChild(div);this.autoObj.className="auto_show";div_index++;}}}this.pressKey(event);window.onresize=Bind(this,function(){this.init();});}}//--></script><body><div align="center" style="padding-top:50px"><input type="text" style="width:300px;height:20px;font-size:14pt;" placeholder="请输入a或b模拟效果" id="o" onkeyup="autoComplete.start(event)"></div><div class="auto_hidden" id="auto"><!--自动完成 DIV--></div><script>var autoComplete=new AutoComplete('o','auto',['b0','b12','b22','b3','b4','b5','b6','b7','b8','b2','abd','ab','acd','accd','b1','cd','ccd','cbcv','cxf']);</script></body></html>以上所述就是本文的全部内容了，希望大家能够喜欢。
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