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<title>JavaScrip高级教程</title>
<strong>第九页：读取cookies</strong>
<p>一旦你在某用户的硬盘上设置了cookie，读取是件很容易的<br>
事．下面是读取cookie范例的代码：</p>
<p>function readCookie()<br>
<br>
{<br>
<br>
var the_cookie = document.cookie;<br>
<br>
var broken_cookie = the_cookie.split(":");<br>
<br>
var the_name = broken_cookie[1];<br>
<br>
var the_name = unescape(the_name);<br>
<br>
alert("Your name is: " + the_name);<br>
<br>
}</p>
<p>第１行很重要．当你的浏览器打开一个网页时，它调用任何和<br>
该网页有关的cookie然后将其载入document.cookie属性．</p>
<p>读取cookie的技巧在于从中抽取出你需要的信息．注意在我们<br>
所设置的cookie是这样的：wm_javascript=username:dave%<br>
20thau．在该函数第１行之后的所有用于从该cookie中提取出<br>
用户名（username）．</p>
<p>var broken_cookie = the_cookie.split(":"); </p>
<p>将cookie在分号处分割成两部分．<br>
var the_name = broken_cookie[1]; </p>
<p>抓取分号后面的内容dave%20thau．<br>
var the_name = unescape(the_name); <br>
取消函数escape()的编码替换．在本例中重新用空格替换了%20．<br>
alert("Your name is: " + the_name); 显示你的姓名．</p>
<p>这个例子使用的cookie只保存了很少的信息：用户名，cookie<br>
最多可以保存多达4kb的信息。<a href="day2_10.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> 读取cookies<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> <a href="day2_11.html">读取和编写多重cookies</a><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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