javascript讀取cookie

<mce:script language="javascript" type="text/javascript"><!--</p><p> function checkCookie()<br /> {<br /> var cookieStr = document.cookie;<br /> username=getCookie("cdb_auth");<br />if(username==""){<br />alert("你還沒有登入！請登入！");<br />return false;<br />}<br />return "";<br /> } </p><p> function getCookie(c_name){<br /> if (document.cookie.length>0){<br /> c_start=document.cookie.indexOf(c_name + "=");<br /> if (c_start!=-1){<br /> c_start=c_start + c_name.length+1+1 ; //如果是字串要去掉冒號<br /> c_end=document.cookie.indexOf(";",c_start);<br /> if (c_end==-1) {<br /> c_end=document.cookie.length<br /> }<br /> return unescape(document.cookie.substring(c_start,c_end-1));<br /> }<br /> }<br /> return ""<br /> }<br />// --></mce:script>