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<title>JavaScrip高级教程</title>
<strong>第十一页：读取和编写多重cookies</strong>
<p>上一篇中我们学习了如何将大量的学习包含在一个cookie中．<br>
另一种方法是使用多重cookies．<br>
<br>
保存多重cookies的方法很直观．每一个cookie都有一个名称．<br>
上一个例子中的cookie的名称是my_happy_cookie，我们可以<br>
这样：<br>
var the_cookie ="my_happy_cookie=happiness_and_joy";<br>
<br>
document.cookie =the_cookie;<br>
<br>
要保存多重cookie，只需给每个cookie一个不同的名字．如果<br>
你要加入一个新的cookie，设置document.cookie 时并不会删<br>
除前面已经设置了的cookies，所以：<br>
<br>
var the_cookie ="my_happy_cookie=happiness_and_joy";<br>
<br>
document.cookie = the_cookie;<br>
<br>
var another_cookie= "my_other_cookie=more_joy_more_happiness";<br>
<br>
document.cookie = another_cookie;<br>
<br>
现在你需要访问这两个cookies，有些复杂，所以你需要明了整<br>
个过程．假设你执行了上面的代码，现在想访问<br>
my_happy_cookie．如果你查看document.cookie的内容，你会<br>
看到：<br>
<br>
my_happy_cookie=happiness_and_joy;<br>
my_other_cookie=more_joy_more_happiness;<br>
<br>
这样很直观，但是如果你想访问某个特定的cookie则有些困难．<br>
下面的代码可以帮助你找出某个特定的cookie：<br>
function WM_readCookie(name)<br>
{<br>
<br>
//如果没有cookie则返回false或者取得值并返回该值<br>
if(document.cookie == '')<br>
return false;<br>
else<br>
return<br>
unescape(WM_getCookieValue(name));<br>
}<br>
<br>
<br>
<br>
function WM_getCookieValue(name)<br>
{<br>
<br>
// Declare variables.<br>
<br>
var firstChar,lastChar;<br>
<br>
// Get the entire cookie string.<br>
// (This may have other<br>
name=value pairs in it.)<br>
<br>
var theBigCookie = document.cookie;<br>
<br>
// Grab<br>
just this cookie from theBigCookie string.<br>
<br>
// Find the start of<br>
'name'.<br>
<br>
firstChar = theBigCookie.indexOf(name);<br>
<br>
// If you found it,<br>
<br>
<br>
if(firstChar != -1)<br>
{<br>
<br>
// skip 'name' and '='.<br>
<br>
firstChar +=<br>
name.length + 1;<br>
<br>
// Find the end of the value string (i.e. the next<br>
';').<br>
<br>
lastChar = theBigCookie.indexOf(';', firstChar);<br>
<br>
<br>
if(lastChar == -1) lastChar = theBigCookie.length;<br>
<br>
// Return the<br>
value.<br>
<br>
return theBigCookie.substring(firstChar, lastChar);<br>
<br>
} else<br>
{<br>
<br>
// If there was no cookie, return false.<br>
<br>
return false;<br>
<br>
<br>
<br>
}<br>
<br>
}<br>
<br>
下面我们将学习一下cookies可以做的真正酷的内容。<a href="day2_12.html">>></a></p>
<p><font face="宋体" size="3" color="#000000"><strong>JavaScript高级教程</strong></font><font color="#FF0000" face="宋体" size="3"><br>
</font><font color="#FF0000">第一页</font> <a href="day2_1.html">Javascript高级教程-第2日</a><br>
<font color="#FF0000">第二页</font> <a href="day2_2.html">神奇的字符串处理</a><br>
<font color="#FF0000">第三页</font> <a href="day2_3.html">子字符串</a><br>
<font color="#FF0000">第四页</font> <a href="day2_4.html">分割方法(splitting
method)</a><br>
<font color="#FF0000">第五页</font> <a href="day2_5.html">相关数组</a><br>
<font color="#FF0000">第六页</font> <a href="day2_6.html">相关数组的一个例子</a><br>
<font color="#FF0000">第七页</font> <a href="day2_7.html">介绍cookie</a><br>
<font color="#FF0000">第八页</font> <a href="day2_8.html">深入了解cookies</a><br>
<font color="#FF0000">第九页</font> <a href="day2_9.html">读取cookies</a><br>
<font color="#FF0000">第十页</font> <a href="day2_10.html">复杂的cookies读取</a><br>
<font color="#FF0000">第十一页</font> 读取和编写多重cookies<br>
<font color="#FF0000">第十二页</font> <a href="day2_12.html">再次深入了解cookies</a><br>
<font color="#FF0000">第十三页</font> <a href="day2_13.html">cookie路径和域</a></p>
<p><font size="3">[<a href="day1_1.html">第1课</a>][第2课][<a href="day3_1.html">第3课</a>][<a href="day4_1.html">第4课</a>][<a href="day5_1.html">第5课</a>]</font></p>
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