JS写入cookies，然后得如何读取？

<SCRIPT language=JScript> function setCookie(name,value) { var Days = 30; var exp = new Date(); exp.setTime(exp.getTime() + Days*24*60*60*1000); document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString(); } setCookie('tool','111') </SCRIPT>
 提示：您可以先修改部分代码再运行

<SCRIPT language=JScript> function setCookie(name,value) { var Days = 30; var exp = new Date(); exp.setTime(exp.getTime() + Days*24*60*60*1000); document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString(); } function getCookie(sName) { var pattern=new RegExp(";?"+sName+"=([^;]*);?"); if (pattern.test(document.cookie)) { return unescape(RegExp["$1"]); } return null; } setCookie('tool','111'); alert(getCookie('tool')); </SCRIPT>
 提示：您可以先修改部分代码再运行