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JS对cookies、localStorage、sessionStorage三种数据操作例子；

<script type="application/x-javascript">
    
    function c(str) {
        console.log(str);
    }

    var doc = document;

    var button = document.getElementById("button");

    button.addEventListener("click",function(){
        test1();
        test2();
        test3();


    },false)

    function test1(){

        cookieUtils.set("name","a001");
        cookieUtils.set("pwd","123456");
        cookieUtils.set("age","23");

        c(cookieUtils.get("pwd"));
       // c(cookieUtils.del("pwd"));

        c(doc.cookie);
    }

    function test2(){
        sessionStorageUtils.set("name","a001");
        sessionStorageUtils.set("pwd","123456");
        sessionStorageUtils.set("age","23");

        c(sessionStorageUtils.get("name"))
        c(sessionStorageUtils.get("pwd"))
        c(sessionStorageUtils.get("age"))

        //c(sessionStorageUtils.del("age"))

        c(sessionStorageUtils.get("age"))
    }

    function test3(){
        localStorageUtils.set("name","a001");
        localStorageUtils.set("pwd","123456");
        localStorageUtils.set("age","23");

        c(localStorageUtils.get("name"))
        c(localStorageUtils.get("pwd"))
        c(localStorageUtils.get("age"))

        //c(localStorageUtils.del("age"))

        c(localStorageUtils.get("age"))
    }


    var cookieUtils = {
        set:function(name,value,expires,path,domain,secure){
            if(name.length <= 0){
                alert("至少需要指定一个名字");
                return false;
            }

            var cookieText = encodeURIComponent(name) + "=" + encodeURIComponent(value);

            if(expires instanceof Date){
                cookieText += "; expires=" + expires.toUTCString();
            }
            if(path){
                cookieText += "; path="+path;
            }
            if(domain){
                cookieText +="; domain="+domain;
            }
            if(secure){
                cookieText +="; "+secure;
            }

            document.cookie = cookieText;
            return true;

        },
        get:function(name){
            var cookieText = encodeURIComponent(name) + "=";
            var cookieValue = "";

            var start = document.cookie.indexOf(cookieText);

            if(start > -1){
                var end = document.cookie.indexOf(";",start);
                if(end == -1){
                    end = document.cookie.length;
                }

                cookieValue = encodeURIComponent(document.cookie.substring(start + cookieText.length,end));

            }
            return cookieValue;

        },
        del:function(name){
            this.set(name,"",new Date(0));
        }

    }

    var sessionStorageUtils = {
        set:function(name,value){
            if(name.length <= 0){
                alert("至少需要指定一个名字");
                return false;
            }

            sessionStorage.setItem(name,value);

            return true;

        },
        get:function(name){
            return sessionStorage.getItem(name);
        },
        del:function(name){
            sessionStorage.removeItem(name);
            return true;
        }
    }

    var localStorageUtils = {
        set:function(name,value){
            if(name.length <= 0){
                alert("至少需要指定一个名字");
                return false;
            }

            localStorage.setItem(name,value);

            return true;
        },
        get:function(name){
            return localStorage.getItem(name);
        },
        del:function(name){
            localStorage.removeItem(name);
            return true;
        }
    }


</script>