<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Math </title> </head> <body> <input name="hah" type="button" value="刷新" onclick="newNum()"/> <script type="text/javascript"> function newNum(){ document.write(Math.random()); } </script> </body> </html>
将 “documen.write”换成“alert”或者“confim”代码就ok了
document.write(document.body.innerHTML);前面加上一句这个。document.write重写了界面,会将原来的全部覆盖掉