JavaScript Cookie 读写删除操作函数详解

读取 Cookie 函数function getCookie( name )
{ 
var start = document.cookie.indexOf( name + "=" );
var len = start + name.length + 1;
if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) {
return null;
} 
if ( start == -1 ) return null;
var end = document.cookie.indexOf( ';', len );
if ( end == -1 ) end = document.cookie.length;
return unescape( document.cookie.substring( len, end ) );
} 
// ---------------------------------------------------- // 
设置 Cookie 函数function setCookie( name, value, expires, path, domain, secure ) {
var today = new Date();
today.setTime( today.getTime() );
if ( expires ) {
expires = expires * 1000 * 60 * 60 * 24;
} 
var expires_date = new Date( today.getTime() + (expires) );
document.cookie = name+'='+escape( value ) +
( ( expires ) ? ';expires='+expires_date.toGMTString() : '' ) + //expires.toGMTString()
( ( path ) ? ';path=' + path : '' ) +
( ( domain ) ? ';domain=' + domain : '' ) +
( ( secure ) ? ';secure' : '' );
} 
// ---------------------------------------------------- // 
删除 Cookie 函数function deleteCookie( name, path, domain )
{ 
if ( getCookie( name ) ) document.cookie = name + '=' +
( ( path ) ? ';path=' + path + '') +
( ( domain ) ? ';domain=' + domain : '' ) +
';expires=Thu, 01-Jan-1970 00:00:01 GMT';
}