escape()和unescape()

下面的简单例子中将你的姓名保存为一个cookie：



function setCookie()

{



var

the_name = prompt("What's your name?","");



var the_cookie =

"wm_javascript=username:" + escape(the_name);



document.cookie =

the_cookie;



alert("Thanks, now go to the next

page.");



}



函数中间的两行是关键：

var the_cookie = "wm_javascript=username:" + escape (the_name);



如果我在提示框中输入了"dave thau"，该行代码将生成一个字符串wm_javascript=username:dave%20thau．这就是说我将把一个名为wm_javascript的cookie保存到硬盘．该cookie的值是username:dave%20thau - 函数 escape()将"dave" 和"thau"间的空格用%20做了替换．当我们读取cookie时，我们寻找名为wm_javascript的cookie，然后提取username:dave%20thau，将其用 unescape()解码，去掉username:．

document.cookie = the_cookie;