escape()和unescape()

    下面的簡單例子中將你的姓名保存為一個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.");
    }
    函數(shù)中間的兩行是關鍵：
    var the_cookie = "wm_javascript=username:" + escape (the_name);
    如果我在提示框中輸入了"dave thau"，該行代碼將生成一個字符串wm_javascript=username:dave%20thau．這就是說我將把一個名為wm_javascript的cookie保存到硬盤．該cookie的值是username:dave%20thau - 函數(shù) escape()將"dave" 和"thau"間的空格用%20做了替換．當我們讀取cookie時，我們尋找名為wm_javascript的cookie，然后提取username:dave%20thau，將其用 unescape()解碼，去掉username:．
    document.cookie = the_cookie;