Js gets the specific implementation of the specified cookie

 
var cookieName = "cookie The name "; 
var cookieValue = null;//Returns the value of the cookie
if (document.cookie && document.cookie != '') { 
var cookies = document.cookie.split(';');//Cut all the obtained cookies into an array
for (var i = 0; i < cookies.length; i++) { 
var cookie = cookies[i];//Gets an array of cookies for a certain index
if (cookie.substring(0, cookieName.length + 2).trim() == cookieName.trim() + "=") {//If the cookie exists, the value of the cookie is pulled out
cookieValue = cookie.substring(cookieName.length + 2, cookie.length); 
break 
} 
} 
} 
if (cookieValue != "" && cookieValue != null) {//If the specified cookie value exists
alert(cookieValue); 
} else {<span style="font-family: Arial, Helvetica, sans-serif;">//If the value of the cookie is null </ span>
alert("not cookie!!!"); 
} 

 
//Remove the blank space
String.prototype.trim = function () { 
return this.replace(new RegExp("(^[\s]*)|([\s]*$)", "g"), ""); 
}