最少代码实现购物车所有功能
话不多说，直接复制下面代码...
<!doctype html> <html> <head> <meta charset="utf-8"> <title>购物车</title> </head> <body> <table class="box"> <tr> <td class="all"><input type="checkbox" />全选</td> <td>商品</td> <td>单价（元）</td> <td>数量</td> <td>小计（元）</td> <td>操作</td> </tr> <tr> <td colspan="6"> <table class="list"> <tr> <td class="pitch"><input type="checkbox" /></td> <td>樱桃（Cherry）MX Board 6.0 G80-3930背光机械键盘 黑色</td> <td class="price">1299.00</td> <td> <div class="quantity"> <span class="num_up">+</span> <var class="num">1</var> <span class="num_down">-</span> </div> </td> <td class="total">1299.00</td> <td class="remove"> <a href="javascript:void(0)">删除</a> </td> </tr> <tr> <td class="pitch"><input type="checkbox" /></td> <td>闪迪(SanDisk) Z410系列 240G 固态硬盘</td> <td class="price">499.00</td> <td> <div class="quantity"> <span class="num_up">+</span> <var class="num">1</var> <span class="num_down">-</span> </div> </td> <td class="total">499.00</td> <td class="remove"> <a href="javascript:void(0)">删除</a> </td> </tr> </table> </td> </tr> <tr> <td class="picths_num">已选择<span>0</span>件</td> <td colspan="5">总价<span class="priceAll">0.00</span></td> </tr> </table> </body> <script> //1.全选按钮 点击｛ // 1.选中所有宝贝，如果所有宝贝为选中状态，则变为不选中 // 2.已选中宝贝数量发生改变 // 3.总价发生改变 // ｝ //2.排序 按钮点击｛ // 默认，宝贝列表，价格从⬆️到⬇️排序 // 然后从⬇️到⬆️排序 // ｝ //3.宝贝按钮选中框 点击｛ // 1.没有选中状态，变为选中状态 // 2.有选中状态，变为没选中状态 // 3.计算数量＊单价 // 4.总价发生改变 // 5.已选中宝贝数量发生改变； // ｝ // 4.宝贝数量按钮 点击｛ // 1.按＋ 则数量＋1 // 2.按－ 则数量－1 // 3.为0的时候，删除当前宝贝 // 4.小计发生改变 // 5.选中框发生改变 // 6.总价发生改变 // 7.已选中宝贝发生改变 // ｝ // 5.删除 按钮 点击｛ // 1.删除当前宝贝的列表项 // 2.总价发生改变 // 3.已选宝贝发生改变 // ｝ // data 数据 // var data = { // to:"上海", // list:[{ // name:"樱桃（Cherry）MX Board 6.0 G80-3930背光机械键盘 黑色", // num:1, // price:1299.00 // },{ // name:"闪迪(SanDisk) Z410系列 240G 固态硬盘", // num:1, // price:499.00, // }] // }; // 全选按钮 var allBtn = document.querySelector(".all input"); // 排序按钮 var sort = document.querySelector(".sort input"); // 宝贝选中按钮 var pitchs = document.querySelectorAll(".list .pitch input"); // 宝贝数量加按钮 var num_up = document.querySelectorAll(".list .num_up"); // 宝贝数量减按钮 var num_down = document.querySelectorAll(".list .num_down"); // 宝贝数量 var num = document.querySelectorAll(".list .num"); // 小计 var total = document.querySelectorAll(".list .total"); // 删除按钮 var remove = document.querySelectorAll(".list .remove"); // 单价 var price = document.querySelectorAll(".list .price"); // 全选按钮状态开关 var allBtn_on = true; // 增加按钮的数量纪录; var addNum = 0; // 减少按钮的数量纪录; var minNum = 0; // 总价 var priceAll = document.querySelector(".priceAll"); var allPrice = 0; // 行数 var tr = document.querySelectorAll(".list tr"); // 已选中宝贝的数量 var picths_num = document.querySelector(".picths_num span"); // 宝贝数量的长度 var length = pitchs.length; for(var i = 0; i < length; i++) { pitchs[i].index = i; num_up[i].index = i; num_down[i].index = i; remove[i].index = i; pitchs[i].onclick = function() { if(this.checked) { picths_num.innerHTML = ++picths_num.innerHTML; allPrice += Number(total[this.index].innerHTML); priceAll.innerHTML = allPrice; } else { picths_num.innerHTML = --picths_num.innerHTML; allPrice -= Number(total[this.index].innerHTML); priceAll.innerHTML = allPrice; } } num_up[i].onclick = function() { addNum = 0; allPrice = 0; var shuliang = num[this.index].innerHTML; shuliang++; num[this.index].innerHTML = shuliang; total[this.index].innerHTML = shuliang * (price[this.index].innerHTML); if(!pitchs[this.index].checked) { pitchs[this.index].checked = true; } for(var i = 0; i < pitchs.length; i++) { if(pitchs[i].checked) { addNum++; allPrice += Number(total[i].innerHTML); } } picths_num.innerHTML = addNum; priceAll.innerHTML = allPrice; } num_down[i].onclick = function() { addNum = 0; allPrice = 0; var shuliang = num[this.index].innerHTML; shuliang--; if(shuliang < 1) { // 执行删除操作 allPrice = 0; tr[this.index].className = "hanmy"; pitchs[this.index].checked = false; tr[this.index].style.display = "none"; if(document.querySelectorAll(".hanmy").length != tr.length) { for(var i = 0; i < tr.length; i++) { if(!tr[i].className && pitchs[i].checked) { removeNum++; picths_num.innerHTML = removeNum; allPrice += Number(total[i].innerHTML); } } } else { console.log("1"); removeNum = 0; allPrice = 0; picths_num.innerHTML = removeNum; picths_num.innerHTML = removeNum } priceAll.innerHTML = allPrice; } else { num[this.index].innerHTML = shuliang; total[this.index].innerHTML = shuliang * (price[this.index].innerHTML); if(!pitchs[this.index].checked) { pitchs[this.index].checked = true; } for(var i = 0; i < pitchs.length; i++) { if(pitchs[i].checked) { addNum++; allPrice += Number(total[i].innerHTML); } } picths_num.innerHTML = addNum; priceAll.innerHTML = allPrice; } } var removeNum = 0; remove[i].onclick = function() { allPrice = 0; tr[this.index].className = "hanmy"; pitchs[this.index].checked = false; tr[this.index].style.display = "none"; if(document.querySelectorAll(".hanmy").length != tr.length) { for(var i = 0; i < tr.length; i++) { if(!tr[i].className && pitchs[i].checked) { removeNum++; picths_num.innerHTML = removeNum; allPrice += Number(total[i].innerHTML); } } } else { console.log("1"); removeNum = 0; allPrice = 0; picths_num.innerHTML = removeNum; picths_num.innerHTML = removeNum } priceAll.innerHTML = allPrice; } } allBtn.onclick = function() { for(var i = 0; i < pitchs.length; i++) { pitchs[i].checked = this.checked; } if(allBtn_on) { picths_num.innerHTML = pitchs.length; for(var j = 0; j < total.length; j++) { allPrice += Number(total[j].innerHTML); } priceAll.innerHTML = allPrice; allBtn_on = false; } else { picths_num.innerHTML = 0; allPrice = 0; priceAll.innerHTML = 0; allBtn_on = true; } } // var html = ""; // // 价格排序开关 // var price_on = true; // sort.onclick=function(){ // html = ""; // var list = data.list; // if(price_on){ // list = up(data.list); // price_on = false; // }else{ // list = down(data.list); // price_on = true; // } // for(var i = 0;i<list.length;i++){ // html +="<tr>"+ // "<td class='pitch'>"+ // "<input type='checkbox'/></td>"+ // "<td>"+list[i].name+"</td>"+ // "<td class='price'>"+list[i].price+"</td>"+ // "<td>"+ // "<div class='quantity'>"+ // "<span class='num_up'>+</span>"+ // "<var class='num'>"+list[i].num+"</var>"+ // "<span class='num_down'>-</span>"+ // "</div>"+ // "</td>"+ // "<td class='total'>"+list[i].price+"</td>"+ // "<td class='remove'>"+ // "<a href='javascript:void(0)'>删除</a>"+ // "</td>"+ // "</tr>"; // } // document.querySelector(".list").innerHTML = html; // } function up(list) { return list.sort(function(a, b) { return a.price - b.price; }); } function down(list) { return list.sort(function(a, b) { return b.price - a.price; }); } </script> </html>