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cookie的跨頁面傳值問題仿購物車案例

大家都知道cookie的特性, cookie生效在同一個域名下,cookie儲存量有限,cookie主要用於記錄使用者的一些資訊,例如記錄使用者的登入資訊使使用者一段時間內不用登入,它有伺服器建立,並放在客戶端。

跨頁面傳值定義:統指WEB頁面之間的傳值,包括簡單的頁面表單傳值和頁面程式中的變數傳值

以下仿寫cookie的跨頁面傳值問題仿購物車案例,把list介面選定的數值跳轉帶到shopCar介面。

list介面:

<!doctype html>
<html lang="en">

    <head>
        <meta charset="UTF-8">
        <title>Document</title>
        <style>
            * {
                margin: 0 auto;
            }
            
            .content {
                width: 800px;
                height: 100px;
                background: #f9f9f9;
                border-radius: 5px;
                box-shadow: 0 3px 10px #666;
                margin: 50px auto;
            }
            
            .picwarp {
                width: 120px;
                height: 98px;
                border: 1px solid #fff;
                float: left;
            }
            
            .picwarp img {
                width: 100%;
                height: 100%;
            }
            
            .warp:after {
                content: '';
                display: block;
                clear: both;
            }
            
            .warp input {
                display: block;
                float: right;
                background: none;
                border: 2px solid #fff;
                border-radius: 2px;
                width: 80px;
                height: 30px;
                margin-top: 30px;
                margin-right: 30px;
            }
            
            .car {
                float: right;
                position: relative;
                width: 80px;
                height: 40px;
                color: red;
                font-size: 30px;
                font-weight: bold;
                right: -100px;
                top: -40px;
                background-image: url(images/1.png);
                background-size: 100% 90%;
                background-repeat: no-repeat;
            }
            
            .text {
                float: left;
            }
            
            .text h4 {
                padding-left: 40px;
                padding-top: 20px;
            }
            
            .text h3 {
                padding-top: 15px;
                padding-left: 40px;
                color: red;
            }
        </style>
        <script src='cookie.js'></script>
        <script>
            window.onload = function() {
                var add = document.getElementById('add');
                var redu = document.getElementById('reduce');
                var num = 0;
                var res = document.getElementById('num');
                var buy = document.getElementById('buy');
                add.onclick = function() {
                    num++
                    res.innerHTML = num;
                }

                redu.onclick = function() {
                    if(num > 0) {
                        num--
                        res.innerHTML = num;
                    }
                }
                buy.onclick = function() {
                    var resNum = res.innerHTML;
                    cookie.setCookie('num', resNum);
                    window.location.href = 'shopCar.html'

                }
            }
        </script>
    </head>

    <body>
        <div class="content">
            <div class="warp">
                <div class="picwarp">
                    <img src="images/2.png" alt="">
                </div>
                <div class="text">
                    <h4>ins小清新玫瑰感化客廳裝飾花瓶</h4>
                    <h3>售價:18</h3>
                </div>
                <input type="button" id="buy" value='立即購買'>
                <input type="button" id='add' value='增加'>
                <input type="button" id='reduce' value='減少'>
            </div>

            <div class="car">
                <span class='num' id='num'>0</span>
            </div>

        </div>
    </body>
</html>

shopCar介面:

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    
    <style>
    #div1{
        width: 859px;
        height: 100px;
        line-height: 100px;
        border: 2px solid #b6b6b6;
        color: blueviolet;
        margin: 80px auto;
    
        font-size: 18px;
        text-align: center;
        
    }

    body{
        background:#f9f9f9;
    }
    
    </style>
</head>
<body>
    <div id='div1'></div>
</body>
<script src='cookie.js'></script>
    <script>
    window.onload=function(){
        var num=cookie.getCookie('num')
        var oDiv=document.getElementById('div1');
        if(num=='0'){
            oDiv.innerHTML='你沒有選中任何商品';
            setTimeout(function(){
                window.location.href='list.html'

            },1000)

        }else{

            oDiv.innerHTML='我知道我要買'+num+'束漂亮的花朵!!心情美美噠!!!'+'<img src="images/2.png">';

        }
    }
    </script>
</html>

封裝的cookie.js

var cookie={
    setCookie:function(name,value,date){
        var d=new Date();
        d.setTime(d.getTime()+date);
        document.cookie=name+'='+value+';expires='+d;
    },
    getCookie:function(name){
        var arr=document.cookie.split('; ');
        for(var i = 0 ; i < arr.length; i ++){
            var arr2=arr[i].split('=');
            if(arr2[0]==name){
                return arr2[1];
            }
        }

        return '';
    },
    removeCookie:function(name){
        cookie.setCookie(name,'',-1)
    }

}

效果:


5640239-7b84e9c0bec8543f.gif

原文作者:祈澈姑娘;技術部落格:https://www.jianshu.com/u/05f416aefbe1
90後前端妹子,愛程式設計,愛運營,愛折騰。 堅持總結工作中遇到的技術問題,堅持記錄工作中所所思所見,歡迎大家一起探討交流。