06/005 sum.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script src="vue.js"></script>
</head>

<body>
    <div id="test">
        <div v-for="(index, item) in items">
            <div>
              <span style="background-color: yellow; width: 80px; display: inline-block;">{{item.name}}</span>
                <input type="text" v-model="item.value" lazy number>
            </div>
        </div>
        计算后：{{total}}
    </div>
    <script>
    Vue.config.debug = true
    var vm = new Vue({
        el: "#test",
        data: {
            items: [{
                name: '安全手套',
                value: 100
            }, {
                name: '手电筒',
                value: 200
            }, {
                name: '雨鞋',
                value: 300
            }]

        },
        computed: {
            total: function() {
                self = this;
                var tmp = 0;
                for (var i = 0; i < self.items.length; ++i) {
                    tmp = tmp + self.items[i].value;
                }
                return tmp;
            }
        }

    })
    </script>
</body>

</html>