<html> <head> <meta charset="utf-8"> <title>无标题文档</title> <style type="text/css"> #div1 { width: 200px; height: 50px; border: 1px solid red; } </style> </head> <body> 姓名：<input type="text" id="txt1" /> 性别：<input type="text" id="txt2" /> <input type="button" id="btn1" value="提交" /> <br> <br> <div id="div1"></div> <script> var otxt1=document.getElementById('txt1'); var otxt2=document.getElementById('txt2'); var odiv1=document.getElementById('div1'); var obtn1=document.getElementById('btn1'); var n1=otxt1.value; var n2=otxt2.value; var d1=odiv1.innerHTML; obtn1.onclick=function() { switch(n2) { case '男': alert('n1+'先生，您好'); break; case '女': d1='n1+'女士，您好'; break; default: d1='n1+'您好'; break; } } </script> </body> </html>