1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title></title> 6 <script> 7 function select(){ 8 var content1=document.getElementById("select"); 9 var content2=document.getElementById("input"); 10 content2.value=content1.value; 11 12 } 13 </script> 14 </head> 15 <body> 16 <select id="select" onchange="select()"> 17 <option value="山东" >山东</option> 18 <option value="河北">河北</option> 19 <option value="重庆">重庆</option> 20 <option value="北京">北京</option> 21 </select> 22 <br> 23 <input type="text" id="input"> 24 </body> 25 </html>