<html > <head> <title>无标题文档</title> </head> <body> <p>人民币换日元</p> <label for="textfield"></label> <input type="text" name="textfield" id="t1" /> <input type="submit" name="button" id="button" onclick="change()" value="汇率转换" /> <p id="t2"></p> <script> function change() { var txt1=document.getElementById("t1"); var txt2=document.getElementById("t2"); txt2.innerHTML=huilv(txt1.value,19); } function huilv(a,b) { return a*b; } </script> </body> </html>