js练习1(十秒钟阅读效果)
<html> <head> <title>10秒钟阅读协议效果</title> </head> <body> <input type="button" name="btn" value="" id="btn" /> <script> var n=10; var time; var b=document.getElementById("btn"); b.disabled=true; b.style.width=50; function change(){ b.value=n; n--; if(n<0){ b.value="同意"; b.disabled=false; clearInterval(time); } } time=setInterval("change()",1000); </script> </body> </html>