js 购物车的实现

购物车原理：创建一个构造函数，把涉及到的项目写成方法，然后把这些方法放到构造函数的原型对象上，通过按钮绑定，调用原型对象上的方法，实现对涉及项目的改变

html代码：

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>购物车</title>

     <script src="./js/gouwu.js"></script>

     <link rel="stylesheet" href="./css/gouwu.css">

 </head>

 <body>

     <table>

         <thead>

             <tr>

                 <th class="tdone">序号</th>

                 <th class="tdtwo">商品名称</th>

                 <th class="tdthree">数量</th>

                 <th class="tdfour">单价</th>

                 <th class="tdfive">小计</th>

                 <th class="tdsix">操作</th>

             </tr>

         </thead>

         <tbody>

             <tr class="trclass">

                 <td class="tdone xuhao">1</td>

                 <td class="tdtwo ">烤煎饼</td>

                 <td class="tdthree"><span class="jiajie"><input type="button" value="-"><span class="num">0</span><input type="button" value="+"></span></td>

                 <td class="tdfour"><span>单价：</span><span class="unit">2</span></td>

                 <td class="tdfive"><span>小计：</span><span class="subtal">0</span></td>

                 <td class="tdsix"><button class="del">删除</button></td>

             </tr>

               <tr class="trclass">

                 <td class="tdone xuhao">2</td>

                 <td class="tdtwo">珍珠奶茶</td>

                 <td class="tdthree"><span class="jiajie"><input type="button" value="-"><span class="num">0</span><input type="button" value="+"></span></td>

                 <td class="tdfour"><span>单价：</span><span class="unit">3.5</span></td>

                 <td class="tdfive"><span>小计：</span><span class="subtal">0</span></td>

                 <td class="tdsix"><button class="del">删除</button></td>

             </tr>

               <tr class="trclass">

                 <td class="tdone xuhao">3</td>

                 <td class="tdtwo">羊肉串</td>

                 <td class="tdthree"><span class="jiajie"><input type="button" value="-"><span class="num">0</span><input type="button" value="+"></span></td>

                 <td class="tdfour"><span>单价：</span><span class="unit">1.5</span></td>

                 <td class="tdfive"><span>小计：</span><span class="subtal">0</span></td>

                 <td class="tdsix"><button class="del">删除</button></td>

             </tr>

               <tr>

                 <td class="tdone xuhao">4</td>

                 <td class="tdtwo">牛肉</td>

                 <td class="tdthree"><span class="jiajie"><input type="button" value="-"><span class="num">0</span><input type="button" value="+"></span></td>

                 <td class="tdfour"><span>单价：</span><span class="unit">10</span></td>

                 <td class="tdfive"><span>小计：</span><span class="subtal">0</span></td>

                 <td class="tdsix"><button class="del">删除</button></td>

             </tr>

               <tr class="trclass">

                 <td class="tdone xuhao">5</td>

                 <td class="tdtwo">烧刀子</td>

                 <td class="tdthree"><span class="jiajie"><input type="button" value="-"><span class="num">0</span><input type="button" value="+"></span></td>

                 <td class="tdfour"><span>单价：</span><span class="unit">1.8</span></td>

                 <td class="tdfive"><span>小计：</span><span class="subtal">0</span></td>

                 <td class="tdsix"><button class="del">删除</button></td>

             </tr>

              <tr class="trclass">

                 <td class="tdone xuhao">6</td>

                 <td class="tdtwo">水煮鱼</td>

                 <td class="tdthree"><span class="jiajie"><input type="button" value="-"><span class="num">0</span><input type="button" value="+"></span></td>

                 <td class="tdfour"><span>单价：</span><span class="unit">15</span></td>

                 <td class="tdfive"><span>小计：</span><span class="subtal">0</span></td>

                 <td class="tdsix"><button class="del">删除</button></td>

             </tr>

              <tr class="trclass">

                 <td class="tdone xuhao">7</td>

                 <td class="tdtwo">花生米</td>

                 <td class="tdthree"><span class="jiajie"><input type="button" value="-"><span class="num">0</span><input type="button" value="+"></span></td>

                 <td class="tdfour"><span>单价：</span><span class="unit">3</span></td>

                 <td class="tdfive"><span>小计：</span><span class="subtal">0</span></td>

                 <td class="tdsix"><button class="del">删除</button></td>

             </tr>

             <tr><td   colspan="6"; class="talast"><span>商品一共 <span class="goods_num">0</span> 件; 共计花费 <span class="pricetal">0</span> 元; 其中最贵的商品单价是 <span class="pricest">0</span> 元</span></td></tr>

         </tbody>

     </table>

 </body>

 </html>

css代码：

     table{

         width:50%;

         position:relative;

         margin:30px auto;

         border-collapse: collapse;

         border:1px solid gray;

     }

     th{

         background: cornflowerblue;

         height:2.5em;

     }

     .tdone{

         width:10%;

     }

     .tdtwo{

         width:20%;

     }

      .tdthree{

         width:20%;

     }

      .tdfour{

         width:20%;

     }

      .tdfive{

         width:20%;

     }

     .tdsix{

         width:10%;

     }

     td{

         height:2em;

         text-align: center;

         border:1px solid #ccc;

     }

     .num{

         display:inline-block;

         width:3em;

     }

     input{

         height:2em;

     }

     .talast{

         text-align: left;

     }

js代码：

 window.onload = function(){

     function cart(){

         this.abtn = document.querySelectorAll('input');

         this.ogood_num = document.querySelector('.goods_num');

         this.opricetal = document.querySelector('.pricetal');

         this.opricest = document.querySelector('.pricest');

         this.totalnum = 0;

     };

      //小计:  商品数量 * 商品单价

     cart.prototype.getsubtotal = function(goodsnum,unitprice){

         return parseInt(goodsnum) * parseFloat(unitprice) ;

     };

     // 计算商品的总计花费

     cart.prototype.gettotal = function(){

         var asubtotal = document.querySelectorAll('.subtal');

         var res = 0;

         for(var i=0,len=asubtotal.length;i<len;i++){

             res += parseFloat(asubtotal[i].innerHTML);

         };

         return res;

     };

     // 寻找购物车中已经选中的产品的最大单价

     cart.prototype.compareMaxunit = function(){

         var anum = document.querySelectorAll('.num');

         var aunit = document.querySelectorAll('.unit');

         var temp = 0;

         for(var i=0,len=anum.length;i<len;i++){

             if(anum[i].innerHTML!=0){

                 if(temp<parseFloat(aunit[i].innerHTML)){

                     temp = parseFloat(aunit[i].innerHTML);

                 }

             }

         };

         return temp;

     };

     // 点击“+”号按钮触发的购物车商品数量，花费，最大价格的变动

     cart.prototype.plus = function(obtn){

         var onum = obtn.parentNode.querySelector('.num');

         var n = parseInt(onum.innerHTML);

         onum.innerHTML = ++n ;

         this.totalnum++;

         var oUnit = obtn.parentNode.parentNode.parentNode.querySelector('.unit');

         var osubtotal = obtn.parentNode.parentNode.parentNode.querySelector('.subtal');

         osubtotal.innerHTML = this.getsubtotal(onum.innerHTML,oUnit.innerHTML);

         this.ogood_num.innerHTML = this.totalnum;

         this.opricetal.innerHTML = this.gettotal();

         this.opricest.innerHTML = this.compareMaxunit();

     };

     // 点击“-”号按钮触发的购物车商品数量，花费，最大价格的变动

      cart.prototype.minus = function(obtn){

         var onum = obtn.parentNode.querySelector('.num');

         if(parseInt(onum.innerHTML)>0){

             var n = parseInt(onum.innerHTML);

             onum.innerHTML = --n ;

             this.totalnum--;

             var oUnit = obtn.parentNode.parentNode.parentNode.querySelector('.unit');

             var osubtotal = obtn.parentNode.parentNode.parentNode.querySelector('.subtal');

             osubtotal.innerHTML = this.getsubtotal(onum.innerHTML,oUnit.innerHTML);

             this.ogood_num.innerHTML = this.totalnum;

             this.opricetal.innerHTML = this.gettotal();

             this.opricest.innerHTML = this.compareMaxunit();

         }

     };

     // 获取已买商品的总计数量

     cart.prototype.getNumbertal = function(){

          var anum = document.querySelectorAll('.num');

          var res_num = 0;

          for(var i =0;i<anum.length;i++){

              res_num += parseInt( anum[i].innerHTML ) ;

          }

          return res_num ;

     }

     // 删除按钮触发的购物车商品数量，花费，最大价格的变动

     cart.prototype.del = function(obtn){

         var odel = obtn.parentNode.parentNode;

         var oparent = odel.parentNode;

         oparent.removeChild(odel);

         this.ogood_num.innerHTML = this.getNumbertal();

         this.opricetal.innerHTML = this.gettotal();

         this.opricest.innerHTML = this.compareMaxunit();

         this.xuhaosort();

     }

     // 购物车序号重新排序

     cart.prototype.xuhaosort = function(){

         var axuhao = document.querySelectorAll('.xuhao');

         for(var i=0,len=axuhao.length;i<len;i++){

             axuhao[i].innerHTML = i+1;

         }

     }

     // 绑定“+”，“-”，删除按钮的点击事件

     cart.prototype.bind = function(){

         var that = this ;

         for(var i=0;i<this.abtn.length;i++){

             if(i%2 !=0){

                 this.abtn[i].onclick = function(){

                     that.plus(this);

                 }

             }else{

                  this.abtn[i].onclick = function(){

                     that.minus(this);

                 }

             }

         };

         var delbtn = document.querySelectorAll('.del');

         for(var i=0;i<delbtn.length;i++){

             delbtn[i].onclick = function(){

                 that.del(this);

             }

         }

     };

     var oCart = new cart();

     oCart.bind();

 }

运行结果：

点击“-”号按钮结果：

点击“+”号按钮结果：

点击“删除”按钮结果：

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