<!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=gb2312" /> <title>编写一个带有两个变量和一个运算符的函数，调用时接收prompt输入</title> <script language="javascript" type="text/javascript"> function account() { var op1=prompt("请输入第一个数：",""); var op2=prompt("请输入第二个数：",""); var sign=prompt("请输入运算符号","") var result; opp1=parseFloat(op1); opp2=parseFloat(op2); switch(sign) { case "+": result=opp1+opp2; alert("两数运算结果为："+result); break; case "-": result=opp1-opp2; alert("两数运算结果为："+result); break; case "*": result=opp1*opp2; alert("两数运算结果为："+result); break; default: result=opp1/opp2; alert("两数运算结果为："+result); break; } } </script> </head> <body> <input name="btn" type="button" value="计算两数运算结果" onclick="account();" /> </body> </html>