12.2 VUE学习之-if判断,实践加减input里的值 

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>vue</title>
    <link rel="stylesheet" href="">
    <!--<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>-->
    <!--<script type="text/javascript" src="../js/jquery-2.1.4.min.js"></script>-->
    <script type="text/javascript" src="../js/vue.js"></script>

</head>
<body>
    <div id="vue">
        <div>
            <span v-if="num > 0" v-on:click="dec(num)">-</span>
            <input v-model="num" type="text">
            <span v-on:click="inc(num)">+</span>
        </div>
    </div>
</body>
<script type="text/javascript">
    var app = new Vue({
        el: "#vue",
        methods:{
            dec:function(num){
                if(app.num>0){
                    app.num=num-1;
                    console.log(app.num);
                }
            },
            inc:function(num){
                app.num=num+1;
                console.log(app.num);
            }
        },
        data:{
            num:0,
        }
    });

</script>
</html>

效果:

posted @ 2019-01-06 12:48  HaimaBlog  阅读(681)  评论(0)  编辑  收藏  举报