JS操作Cookie写入和读取实例代码

var u = "value=123"; 
document.cookie = u; 
 
读取cookie实例,读取value的值！ 
 代码如下:

var c_name="value"; // 变量名 
if (document.cookie.length > 0) { 
c_start = document.cookie.indexOf(c_name + "=") 
if (c_start != -1) { 
c_start = c_start + c_name.length + 1 
c_end = document.cookie.indexOf(";", c_start) 
if (c_end == -1) c_end = document.cookie.length 
// document.write(document.cookie.substring(c_start,c_end)+"<br>"); 
var sss= unescape(document.cookie.substring(c_start, c_end)) // 取出值 
alert(sss) 
} 
}