The specific implementation of js to obtain the specified cookie_javascript skills

var cookieName = "cookie name";
var cookieValue = null;//Return the value of the cookie
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');//will get Cut all cookies into arrays
for (var i = 0; i < cookies.length; i ) {
var cookie = cookies[i];//Get the cookies array of a certain subscript
if ( cookie.substring(0, cookieName.length 2).trim() == cookieName.trim() "=") {//If the cookie exists, take out the cookie value
cookieValue = cookie.substring( cookieName.length 2, cookie.length);
break
}
}
}
if (cookieValue != "" && cookieValue != null) {//If the specified cookie exists Value
alert(cookieValue);
} else {//If the cookie value is empty
alert("not cookie!!!");
}

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