Javascript读写Cookie代码详解编程语言

function createCookie(name,value,days) { 
    if (days) { 
        var date = new Date(); 
        date.setTime(date.getTime()+(days*24*60*60*1000)); 
        var expires = "; expires="+date.toGMTString(); 
    } 
    else var expires = ""; 
    document.cookie = name+"="+value+expires+"; path=/"; 
} 
 
function readCookie(name) { 
    var nameEQ = name + "="; 
    var ca = document.cookie.split(';'); 
    for(var i=0;i < ca.length;i++) { 
        var c = ca[i]; 
        while (c.charAt(0)==' ') c = c.substring(1,c.length); 
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length); 
    } 
    return null; 
} 
 
function eraseCookie(name) { 
    createCookie(name,"",-1); 
}