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js简易版购物车功能如何实现

本文实例为大家分享了js购物车功能的具体代码,供大家参考,具体内容如下 <!DOCTYPE html> <html> <head> <...

本文实例为大家分享了js购物车功能的具体代码,供大家参考,具体内容如下

<!DOCTYPE html>
<html>

  <head>
    <meta charset="UTF-8">
    <title></title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }

      li {
        list-style: none;
      }

      li {
        float: left;
        width: 200px;
        border: 1px #000 solid;
        margin: 10px;
      }

      li img {
        width: 200px;
      }

      p {
        height: 20px;
        border-bottom: 1px #333 dashed;
      }

      #bus {
        width: 600px;
        border: 1px #000 solid;
        height: 300px;
        clear: both;
      }

      .box1 {
        float: left;
        width: 200px;
      }

      .box2 {
        float: left;
        width: 200px;
      }

      .box3 {
        float: left;
        width: 200px;
      }

      #allMoney {
        float: right;
      }
    </style>
    <script>
      window.onload = function() {
        var oList = document.getElementById(‘list‘);
        var aLi = oList.getElementsByTagName(‘li‘);
        var oBus = document.getElementById(‘bus‘);

        var obj = {};
        var iNum = 0;
        var allMoney = 0;

        for (var i = 0; i < aLi.length; i++) {
          aLi[i].ondragstart = function(ev) {
            //点击拖拽元素的时候,就设置数据,以后放到购物车的时候数据就可以传过去了
            var ev = ev || window.event;
            var aP = this.getElementsByTagName(‘p‘);
            ev.dataTransfer.setData(‘title‘, aP[0].innerHTML);
            ev.dataTransfer.setData(‘price‘, aP[1].innerHTML);
            ev.dataTransfer.setDragImage(this, 0, 0);
          }
        }

        oBus.ondragover = function(ev) {
          //阻止鼠标默认事件
          var ev = ev || event;
          ev.preventDefault();
        };
        oBus.ondrop = function(ev) {
          var ev = ev || event;
          var title = ev.dataTransfer.getData(‘title‘);
          var price = ev.dataTransfer.getData(‘price‘);  

          if(!obj[title]){

            var oP = document.createElement(‘p‘);
            var oSpan = document.createElement(‘span‘);
            oSpan.className = ‘box1‘;
            oSpan.innerHTML = 1;
            oP.appendChild(oSpan);

            var oSpan = document.createElement(‘span‘);
            oSpan.className = ‘box2‘;
            oSpan.innerHTML = title;
            oP.appendChild(oSpan);

            var oSpan = document.createElement(‘span‘);
            oSpan.className = ‘box3‘;
            oSpan.innerHTML = price;
            oP.appendChild(oSpan);

            oBus.appendChild(oP);

            obj[title] = 1;
          }else{
            var box1 = document.getElementsByClassName(‘box1‘);
            var box2 = document.getElementsByClassName(‘box2‘);
            for(var i=0;i<box2.length;i++){
              if(box2[i].innerHTML == title){
                box1[i].innerHTML = parseInt(box1[i].innerHTML) + 1;
              };
            };

          };
          //总价
          if(!allMoney){
            allMoney = document.createElement(‘div‘);
            allMoney.id = ‘allMoney‘;
          }
          iNum += parseInt(price);
          allMoney.innerHTML = ‘¥‘+iNum;
          oBus.appendChild(allMoney);
        };
      };
    </script>
  </head>

  <body>
    <ul id="list">
      <li draggable="true">
        <img src="img/img1.jpg" />
        <p>javascript语言精粹</p>
        <p>40¥</p>
      </li>
      <li draggable="true">
        <img src="img/img2.jpg" />
        <p>javascript权威指南</p>
        <p>120¥</p>
      </li>
      <li draggable="true">
        <img src="img/img3.jpg" />
        <p>精通javascript</p>
        <p>35¥</p>
      </li>
      <li draggable="true">
        <img src="img/img4.jpg" />
        <p>DOM编程艺术</p>
        <p>45¥</p>
    </ul>
    <div id="bus"></div>
  </body>

</html>