vue基础---04计算属性

00.计算属性

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>

    <div id="app">
        <!-- 一般情况下写法:这种每次都会计算，效率低 -->
        <h1>{{firstname+lastname}}</h1>
        <!-- 计算属性 -->
        <h1>{{fullname}}</h1>
    </div>
    <script type="text/javascript">
        var app=new Vue({
            el:"#app",
            data:{
                firstname:"张",
                lastname:"三"
            },
            computed:{//计算属性
                fullname:function(){
                    return this.firstname+this.lastname
                }
            }
        })
    </script>
</body>
</html>

01.列表渲染和计算属性混合使用

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>

    <div id="app">
        <!-- 一般情况下写法:这种每次都会计算，效率低 -->
        <h1>{{firstname+lastname}}</h1>
        <!-- 计算属性 -->
        <h1>{{fullname}}</h1>
    </div>
    <script type="text/javascript">
        var app=new Vue({
            el:"#app",
            data:{
                firstname:"张",
                lastname:"三"
            },
            computed:{//计算属性
                fullname:function(){
                    return this.firstname+this.lastname
                }
            }
        })
    </script>
</body>
</html>

posted @ 2021-09-10 11:49 !ment 阅读(72) 评论(0) 编辑收藏举报

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vue基础---04计算属性