<div class="catbox">    <table id="cartTable">        <thead>        <tr>            <th><label>                <input class="check-all check" type="checkbox">&nbsp;&nbsp;全选</label></th>            <th>商品</th>            <th>单价</th>            <th>数量</th>            <th>小计</th>            <th>操作</th>        </tr>        </thead>        <tbody>        <tr class="on">            <td class="checkbox"><input class="check-one check" type="checkbox"></td>            <td class="goods"><img src=http://www.mamicode.com/"" alt=""><span>Casio/卡西欧 EX-TR350</span></td>            <td class="price">5999.88</td>            <td class="count"><span class="reduce"></span>                <input class="count-input" type="text" value=http://www.mamicode.com/"1">                <span class="add">+</span></td>            <td class="subtotal">5999.88</td>            <td class="operation"><span class="delete">删除</span></td>        </tr>        <tr class="on">            <td class="checkbox"><input class="check-one check" type="checkbox"></td>            <td class="goods"><img src=http://www.mamicode.com/"" alt=""><span>Canon/佳能 PowerShot SX50 HS</span></td>            <td class="price">3888.50</td>            <td class="count"><span class="reduce"></span>                <input class="count-input" type="text" value=http://www.mamicode.com/"1">                <span class="add">+</span></td>            <td class="subtotal">3888.50</td>            <td class="operation"><span class="delete">删除</span></td>        </tr>        <tr class="on">            <td class="checkbox"><input class="check-one check" type="checkbox"></td>            <td class="goods"><img src=http://www.mamicode.com/"" alt=""><span>Sony/索尼 DSC-WX300</span></td>            <td class="price">1428.50</td>            <td class="count"><span class="reduce"></span>                <input class="count-input" type="text" value=http://www.mamicode.com/"1">                <span class="add">+</span></td>            <td class="subtotal">1428.50</td>            <td class="operation"><span class="delete">删除</span></td>        </tr>        <tr class="on">            <td class="checkbox"><input class="check-one check" type="checkbox"></td>            <td class="goods"><img src=http://www.mamicode.com/"" alt=""><span>Fujifilm/富士 instax mini 25</span></td>            <td class="price">640.60</td>            <td class="count"><span class="reduce"></span>                <input class="count-input" type="text" value=http://www.mamicode.com/"1">                <span class="add">+</span></td>            <td class="subtotal">640.60</td>            <td class="operation"><span class="delete">删除</span></td>        </tr>        </tbody>    </table>    <div class="foot" id="foot">        <label class="fl select-all"><input type="checkbox" class="check-all check">&nbsp;&nbsp;全选</label>        <a class="fl delete" id="deleteAll" href=http://www.mamicode.com/"javascript:;">删除</a>        <div class="fr closing" onclick="getTotal();">结 算</div>        <input type="hidden" id="cartTotalPrice">        <div class="fr total">合计：￥<span id="priceTotal">11957.48</span></div>        <div class="fr selected" id="selected">已选商品<span id="selectedTotal">4</span>件<span class="arrow up">︽</span><span class="arrow down">︾</span></div>        <div class="selected-view">            <div id="selectedViewList" class="clearfix"><div><img src=http://www.mamicode.com/"http://www.jq22.com/demo/jquery-guc20151105/images/1.jpg"><span class="del" index="0">取消选择</span></div><div><img src=http://www.mamicode.com/"http://www.jq22.com/demo/jquery-guc20151105/images/2.jpg"><span class="del" index="1">取消选择</span></div><div><img src=http://www.mamicode.com/"http://www.jq22.com/demo/jquery-guc20151105/images/3.jpg"><span class="del" index="2">取消选择</span></div><div><img src=http://www.mamicode.com/"http://www.jq22.com/demo/jquery-guc20151105/images/4.jpg"><span class="del" index="3">取消选择</span></div></div>            <span class="arrow">◆<span>◆</span></span> </div>    </div></div>

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<script>    /**     * Created by an www.jq22.com     */    window.onload = function () {        if (!document.getElementsByClassName) {            document.getElementsByClassName = function (cls) {                var ret = [];                var els = document.getElementsByTagName(‘*‘);                for (var i = 0, len = els.length; i < len; i++) {                    if (els[i].className.indexOf(cls + ‘ ‘) >=0 || els[i].className.indexOf(‘ ‘ + cls + ‘ ‘) >=0 || els[i].className.indexOf(‘ ‘ + cls) >=0) {                        ret.push(els[i]);                    }                }                return ret;            }        }        var table = document.getElementById(‘cartTable‘); // 购物车表格        var selectInputs = document.getElementsByClassName(‘check‘); // 所有勾选框        var checkAllInputs = document.getElementsByClassName(‘check-all‘) // 全选框        var tr = table.children[1].rows; //行        var selectedTotal = document.getElementById(‘selectedTotal‘); //已选商品数目容器        var priceTotal = document.getElementById(‘priceTotal‘); //总计        var deleteAll = document.getElementById(‘deleteAll‘); // 删除全部按钮        var selectedViewList = document.getElementById(‘selectedViewList‘); //浮层已选商品列表容器        var selected = document.getElementById(‘selected‘); //已选商品        var foot = document.getElementById(‘foot‘);        // 更新总数和总价格，已选浮层        function getTotal() {            var seleted = 0;            var price = 0;            var HTMLstr = ‘‘;            for (var i = 0, len = tr.length; i < len; i++) {                if (tr[i].getElementsByTagName(‘input‘)[0].checked) {                    tr[i].className = ‘on‘;                    seleted += parseInt(tr[i].getElementsByTagName(‘input‘)[1].value);                    price += parseFloat(tr[i].cells[4].innerHTML);                    HTMLstr += ‘<div><img src="http://www.mamicode.com/‘ + tr[i].getElementsByTagName(‘img‘)[0].src + ‘"><span class="del" index="‘ + i + ‘">取消选择</span></div>‘                }                else {                    tr[i].className = ‘‘;                }            }            selectedTotal.innerHTML = seleted;            priceTotal.innerHTML = price.toFixed(2);            selectedViewList.innerHTML = HTMLstr;            if (seleted == 0) {                foot.className = ‘foot‘;            }        }        // 计算单行价格        function getSubtotal(tr) {            var cells = tr.cells;            var price = cells[2]; //单价            var subtotal = cells[4]; //小计td            var countInput = tr.getElementsByTagName(‘input‘)[1]; //数目input            var span = tr.getElementsByTagName(‘span‘)[1]; //-号            //写入HTML            subtotal.innerHTML = (parseInt(countInput.value) * parseFloat(price.innerHTML)).toFixed(2);            //如果数目只有一个，把-号去掉            if (countInput.value =http://www.mamicode.com/= 1) {                span.innerHTML = ‘‘;            }else{                span.innerHTML = ‘-‘;            }        }        // 点击选择框        for(var i = 0; i < selectInputs.length; i++ ){            selectInputs[i].onclick = function () {                if (this.className.indexOf(‘check-all‘) >= 0) { //如果是全选，则吧所有的选择框选中                    for (var j = 0; j < selectInputs.length; j++) {                        selectInputs[j].checked = this.checked;                    }                }                if (!this.checked) { //只要有一个未勾选，则取消全选框的选中状态                    for (var i = 0; i < checkAllInputs.length; i++) {                        checkAllInputs[i].checked = false;                    }                }                getTotal();//选完更新总计            }        }        // 显示已选商品弹层        selected.onclick = function () {            if (selectedTotal.innerHTML != 0) {                foot.className = (foot.className == ‘foot‘ ? ‘foot show‘ : ‘foot‘);            }        }        //已选商品弹层中的取消选择按钮        selectedViewList.onclick = function (e) {            var e = e || window.event;            var el = e.srcElement;            if (el.className==‘del‘) {                var input =  tr[el.getAttribute(‘index‘)].getElementsByTagName(‘input‘)[0]                input.checked = false;                input.onclick();            }        }        //为每行元素添加事件        for (var i = 0; i < tr.length; i++) {            //将点击事件绑定到tr元素            tr[i].onclick = function (e) {                var e = e || window.event;                var el = e.target || e.srcElement; //通过事件对象的target属性获取触发元素                var cls = el.className; //触发元素的class                var countInout = this.getElementsByTagName(‘input‘)[1]; // 数目input                var value = http://www.mamicode.com/parseInt(countInout.value); //数目                //通过判断触发元素的class确定用户点击了哪个元素                switch (cls) {                    case ‘add‘: //点击了加号                        countInout.value = http://www.mamicode.com/value + 1;                        getSubtotal(this);                        break;                    case ‘reduce‘: //点击了减号                        if (value > 1) {                            countInout.value = value - 1;                            getSubtotal(this);                        }                        break;                    case ‘delete‘: //点击了删除                        var conf = confirm(‘确定删除此商品吗？‘);                        if (conf) {                            this.parentNode.removeChild(this);                        }                        break;                }                getTotal();            }            // 给数目输入框绑定keyup事件            tr[i].getElementsByTagName(‘input‘)[1].onkeyup = function () {                var val = parseInt(this.value);                if (isNaN(val) || val <= 0) {                    val = 1;                }                if (this.value != val) {                    this.value =http://www.mamicode.com/ val;                }                getSubtotal(this.parentNode.parentNode); //更新小计                getTotal(); //更新总数            }        }        // 点击全部删除        deleteAll.onclick = function () {            if (selectedTotal.innerHTML != 0) {                var con = confirm(‘确定删除所选商品吗？‘); //弹出确认框                if (con) {                    for (var i = 0; i < tr.length; i++) {                        // 如果被选中，就删除相应的行                        if (tr[i].getElementsByTagName(‘input‘)[0].checked) {                            tr[i].parentNode.removeChild(tr[i]); // 删除相应节点                            i--; //回退下标位置                        }                    }                }            } else {                alert(‘请选择商品！‘);            }            getTotal(); //更新总数        }        console.log("\u767e\u5ea6\u641c\u7d22\u3010\u7d20\u6750\u5bb6\u56ed\u3011\u4e0b\u8f7d\u66f4\u591aJS\u7279\u6548\u4ee3\u7801");        // 默认全选        checkAllInputs[0].checked = true;        checkAllInputs[0].onclick();    }</script>