JavaScript实现Select下拉框去重功能

Select下拉框去重实现

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>删除select中重复项</title> <style type="text/css"> body{ text-align:center;} div{ width:400px; background:#f1f5fa; margin:auto; border:solid 1px #BFC9DB; padding:10px;} h4{ } a{text-align:right; display:block; font-size:12px;} </style> <script type="text/javascript"> /*定义全局函数$*/ function $(id){ return document.getElementById(id); } /*初始化select*/ function InitialSelectOption(id){ var oSel=$(id); var aOptions=["Wang Hongjian","Wang Hongjian","Nichoal Smith","Nichoal Smith","David Gates","David Gates","David Gates","Wang Hongjian","Wang Hongjian","Nichoal Smith","Nichoal Smith","David Gates","David Gates","David Gates"]; var i=0; oSel.options.length=0; while(i </head> <body> <div> <h4>删除select重复项演示</h4> https://www.jb51.net/ <hr /> <select id="sel" multiple="multiple" size="1"><option>待初始化…</select> <hr /> <button id="btnInital">初始化</button> <button id="btnDistinct">删除重复项</button> </div> </body> </html> 

注意：若引入外部JavaScript文件，需刷新页面方可执行。