首页手记最完美的购物车页面js，可全选，计算总价，传列表套字典。

最完美的购物车页面js，可全选，计算总价，传列表套字典。

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JQuery JavaScript 前端工具

<html>
<head>
<meta charset="gb2312">
<title>购物车功能</title>
</head>
<body>
<!--这块是用的兄弟结点，节点元素不一样只改动span，看页面布局-->
<input class="check" type="checkbox" id="count_1" onclick="count(1)" product_id="101">产品一
    单价<span id="price_1">10</span>
    数量<span id="num_1">1</span>
<br>

<input class="check" type="checkbox" id="count_2" onclick="count(2)" product_id="102">产品二
    单价<span id="price_2">20</span>
    数量<span id="num_2">2</span>
<br>

<input class="check" type="checkbox" id="count_3" onclick="count(3)" product_id="103">产品三
    单价<span id="price_3">30</span>
    数量<span id="num_3">3</span>
<br>

<input class="check" type="checkbox" id="count_4" onclick="count(4)" product_id="104">产品四
    单价<span id="price_4">40</span>
    数量<span id="num_4">4</span>
<br>

<br><br><br><br>
合计：￥<span id="total">0</span>
<input type="checkbox" id="allcheck">全选<br><br>
<button onclick="pay()">结算</button>

<script class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://cdn.bootcss.com/jquery/1.11.1/jquery.min.js"></script>
</body>
<script>

// 全选/反选 功能
$('#allcheck').click(function(){
    if(document.getElementById("allcheck").checked){
        var oneCheck = $(".check");
        for(var i=0;i<oneCheck.length;i++){
            oneCheck[i].checked = true;
            oneCheck.eq(i).attr("checked","checked");
        }
        setPrice();
    }else{
        var oneCheck = $(".check");
        for(var i=0;i<oneCheck.length;i++){
            oneCheck[i].checked = false;
            oneCheck.eq(i).attr("checked",false);
        }
        // 反选总价清零
        $('#total').html(0);
    }
});

// 计算所有选中产品总价
function setPrice(){
    var total = 0;
    var checkTrue = $(".check");
    for(var i=0;i<checkTrue.length;i++){
        total = parseInt(total) + parseInt(checkTrue.eq(i).next("span").html() * checkTrue.eq(i).next("span").next("span").html())
    }
    $('#total').html(total);
}

// 单选计算总合计
function count(id){
    var total = $('#total').html();
    if(document.getElementById("count_"+id).checked){
        $('#count_'+id).attr("checked","checked");
        total = parseInt(total) + parseInt($('#price_'+id).html() * $('#num_'+id).html());
        $('#total').html(total);
    }else{
        $('#count_'+id).attr("checked",false);
        total = parseInt(total) - parseInt($('#price_'+id).html() * $('#num_'+id).html());
        $('#total').html(total);
    }
}

// 结算选中商品(列表套字典的形式传到后台)
function pay(){
    var checkTrue = $(".check");
    var buylist = new Array();
    var product = "";
    for (var i=0;i<checkTrue.length;i++){
        if($(".check").eq(i).attr("checked") == "checked"){
            product = '{"product_id":'+$(".check").eq(i).attr("product_id")+',"number":'+checkTrue.eq(i).next("span").next("span").html()+'}';
            buylist.push(product);
        }
    }
    if(buylist.length > 0){
        buylist = '[' + buylist +']';
        console.log(buylist);
    }else{
        alert("未选中商品");
    }
}
</script>
</html>

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