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<script type="text/vbscript">
function getpychar(char) tmp=65536+asc(char) if(tmp>=45217 and tmp<=45252) then getpychar= "A" if(tmp>=45253 and tmp<=45760) then getpychar= "B" if(tmp>=45761 and tmp<=46317) then getpychar= "C" if(tmp>=46318 and tmp<=46825) then getpychar= "D" if(tmp>=46826 and tmp<=47009) then getpychar= "E" if(tmp>=47010 and tmp<=47296) then getpychar= "F" if(tmp>=47297 and tmp<=47613) then getpychar= "G" if(tmp>=47614 and tmp<=48118) then getpychar= "H" if(tmp>=48119 and tmp<=49061) then getpychar= "J" if(tmp>=49062 and tmp<=49323) then getpychar= "K" if(tmp>=49324 and tmp<=49895) then getpychar= "L" if(tmp>=49896 and tmp<=50370) then getpychar= "M" if(tmp>=50371 and tmp<=50613) then getpychar= "N" if(tmp>=50614 and tmp<=50621) then getpychar= "O" if(tmp>=50622 and tmp<=50905) then getpychar= "P" if(tmp>=50906 and tmp<=51386) then getpychar= "Q" if(tmp>=51387 and tmp<=51445) then getpychar= "R" if(tmp>=51446 and tmp<=52217) then getpychar= "S" if(tmp>=52218 and tmp<=52697) then getpychar= "T" if(tmp>=52698 and tmp<=52979) then getpychar= "W" if(tmp>=52980 and tmp<=53640) then getpychar= "X" if(tmp>=53689 and tmp<=54480) then getpychar= "Y" if(tmp>=54481 and tmp<=55289) then getpychar= "Z" end function function getpy(str) Dim i For i=1 to len(str) getpy=getpy&getpychar(mid(str,i,1)) next 
end function </script> <script type="text/javascript"><!--//Author: Don.cnblogs.com //QQ:83458106
var FilterDDL = function (ddlElement) {
this.selectIndex=0; this.ddl=ddlElement; this.letters=["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"]; //初始化 this.init=function(){ for(i=0;i<this.ddl.options.length;i++) { var optionText =this.ddl.options[i].innerText; var py= getpy(optionText.length>0 ? optionText.substring(0,1):""); if(!py)py=""; this.ddl.options[i].py= py;
} this.ddl.onkeydown=this.keydown; }; //接收按键事件 this.keydown=function(){ var object = arguments.callee.object; var changed=false; if(event.keyCode<=90 && event.keyCode>=65) //键入字母 { var keyLetter = object.letters[event.keyCode-65]; var startIndex= keyLetter == object.ddl.options[object.ddl.selectedIndex].py ? object.ddl.selectedIndex+1 : 0; //找到开始位置 for(i=0;i<object.ddl.options.length;i++) //遍历options { var index=i+startIndex; //当前偏移量 if(index>=object.ddl.options.length) //如果超过总长度 index=index-object.ddl.options.length; //从头开始 if(object.ddl.options[index].py == keyLetter) { object.ddl.options[index].selected=true; break; } } } }; this.keydown.object = this;}//--></script><br /><select id="ddlCity" ><option value=""></option><option value="">北京</option><option value="">天津</option><option value="">上海</option><option value="">重庆</option><option value="">石家庄市</option><option value="">唐山市</option><option value="">秦皇岛市</option><option value="">邯郸市</option><option value="">邢台市</option><option 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document.getElementById("ddlCity"); var ddl1=new FilterDDL(ddlCity); ddl1.init();//--></script> </body></html>