Js读取Cookies

//Js读取Cookies
function getCookie(name, key) {
    var nameValue = "";
    var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
    if (arr = document.cookie.match(reg)) {
        nameValue = decodeURI(arr[2]);
    }
    if (key != null && key != "") {
        reg = new RegExp("(^| |&)" + key + "=([^(;|&|=)]*)(&|$)");
        if (arr = nameValue.match(reg)) {
            return decodeURI(arr[2]);
        }
        else return "";
    }
    else {
        return nameValue;
    }
}