JS操作Cookie書き込みとインスタンスコードの読み込み

 
  
var u = "value=123"; 
  
document.cookie = u; 
  
 
 

 
  
var c_name="value"; //     
  
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)+"
"); 
  
var sss= unescape(document.cookie.substring(c_start, c_end)) //     
  
alert(sss) 
  
} 
  
}