个人练习-jq 计算总价

大概思路：单个勾选、全选、取消全选、点击加减时都要计算

1、先遍历每一个 li ,判断是否被勾选

2、如果已勾选，则将该条进行计算

3、最后的总价就是每个勾选后的计算结果进行累加，取小数位两位

效果图如下：

html代码：

<div class="s_wrap">
    <ul class="price_list">
        <li>
            <p class="check"></p>
            <p class="name">儿童 防蓝光眼镜 护目镜 钛架 电脑办公玩手机 5078</p>
            <div class="feed_in">
                <p class="minus">-</p>
                <label><input name="price" type="number" value="1"></label>
                <p class="plus">+</p>
            </div>
            <p class="unit_price">￥<span>100.00</span>元</p>
        </li>
        <li>
            <p class="check"></p>
            <p class="name">止咳枇杷颗粒</p>
            <div class="feed_in">
                <p class="minus">-</p>
                <label><input name="price" type="number" value="1"></label>
                <p class="plus">+</p>
            </div>
            <p class="unit_price">￥<span>50.00</span>元</p>
        </li>
    </ul>

    <div class="clr">
        <p class="select"><span id="cancelAll">取消</span><span id="checkAll">全选</span></p>
        <p class="total">合计 <span id="totalPrice">0.00</span></p>
    </div>

</div>

css 代码：

.fl{float: left;}
.fr{float: right;}
.clr{*zoom: 1;}
.clr:after{content:".";display:block;height:0;clear:both;visibility:hidden;}

.s_wrap{ width: 960px; min-height: 100px; border:1px solid #ddd; margin: 30px auto 0 auto; background: #fff; padding:20px; border-radius:2px; }
.price_list li{ margin-bottom: 10px; line-height: 32px; zoom: 1; font-size: 14px; color: #333; }
.price_list li:after{ display: block; height: 0; clear: both; visibility: hidden; content: "."; }
.check{ float: left; width: 26px; height: 26px; border:1px solid #ddd; margin-top: 3px; cursor: pointer; }
.check_on{ background: url("images/duigou.png") no-repeat center; }
.name{ padding-left: 30px; float: left; width: 350px; }
.unit_price{ float: left; color: #f60; }
.feed_in{ float: left; width: auto; height: 30px; line-height: 30px; border:1px solid #ddd; margin:0 30px; border-radius:3px; }
.feed_in p{ float: left; width: 30px; height: 30px; text-align: center; font-size: 18px; cursor: pointer; }
.feed_in label{ display: block; float: left; }
.feed_in input{ width: 40px; height: 30px; line-height: 30px; text-align: center; border:0; border-left: 1px solid #ddd; border-right: 1px solid #ddd; }
.total{ float: right; width: 300px; padding:10px 0; font-size: 16px; color: #333; text-align: right; padding-right: 320px; }
.total span{ color: #f60; }
.select{ float: left; padding-top: 8px; width: 300px; font-size: 14px; color: #333; }
.select span{ display: inline-block; width: 40px; line-height: 30px; text-align: center; vertical-align: middle; cursor: pointer; }
.select span:hover{ color: #f60; }

jq代码：

$(document).ready(function(){

    $(".check").click(function(){
        $(this).toggleClass("check_on");//点击选择
        upDataPrice2();
    });

    //点击减的时候计算总价
    $(".minus").click(function(){
        var that = $(this);
        var minusVal = that.parents("div.feed_in").find("input[name='price']").val();
        var i = parseInt(minusVal);
        if(minusVal > 1 ){
            i = i -1;
            var minusNum = that.parents("div.feed_in").find("input[name='price']");
            minusNum.val(i);
        }
        var check = $(this).parents("li").find(".check");
        upDataPrice2();

    });

    //点击加的时候计算总价
    $(".plus").click(function(){
        var that = $(this);
        var plusVal = that.parents("div.feed_in").find("input[name='price']").val();
        var i = parseInt(plusVal);
        if(plusVal < 35 ){
            i = i + 1;
            var plusNum = that.parents("div.feed_in").find("input[name='price']");
            plusNum.val(i);
        }else{
            alert("最多购买35件")
        }
        var check = $(this).parents("li").find(".check");
        upDataPrice2();
    });

    //全选
    $("#checkAll").click(function(){
        $(".price_list li").each(function(){
            var allCheck = $(this).find(".check");
            if(allCheck.hasClass("check_on")){
                return;
            }else{
                allCheck.addClass("check_on");
            }
        });
        upDataPrice2();
    });

    //取消全选
    $("#cancelAll").click(function(){
        $(".price_list li").each(function(){
            var allCheck = $(this).find(".check");
            if(allCheck.hasClass("check_on")){
                allCheck.removeClass("check_on");
            }
        });
        upDataPrice2();
    });

});

//计算总价函数
function upDataPrice2(){
    var totalPrice = 0;
    var count = $(".feed_in input[name='price']");
    var price = $(".unit_price span");
    $(".price_list li").each(function(i){
        var sCheck = $(this).find(".check");
        if(sCheck.hasClass("check_on")){
            var countNum = $(count[i]).val();
            var priceNum = $(price[i]).text();
            totalPrice += countNum * priceNum;
        }
    });
    $("#totalPrice").text(totalPrice.toFixed(2));
}