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vue26-2.0循环

2024-10-04 13:32:02   217人阅读

        
3. 循环
    2.0里面默认就可以添加重复数据

    arr.forEach(function(item,index){

    });

    去掉了隐式一些变量
        $index    $key

    之前:
        v-for="(index,val) in array"
    现在:
        v-for="(val,index) in array"


4. 可以添加重复数据：track-by="id"
    变成
        <li v-for="(val,index) in list" :key="index">
   :key="index"是为了提升循环性能
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>智能社——http://www.zhinengshe.com</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <style>

    </style>
    <script src="vue1.0.js"></script>
    <script>
        window.onload=function(){
            new Vue({
                el:‘#box‘,
                data:{
                    list:[‘width‘,‘height‘,‘border‘]
                },
                methods:{
                    add(){
                        this.list.push(‘background‘);
                    }
                }
            });
        };
    </script>
</head>
<body>
    <div id="box">
        <input type="button" value="添加" @click="add">
        <ul>
            <li v-for="val in list" track-by="$index">
                {{val}}
            </li>
        </ul>
    </div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>智能社——http://www.zhinengshe.com</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <style>

    </style>
    <script src="vue.js"></script>
    <script>
        window.onload=function(){
            new Vue({
                el:‘#box‘,
                data:{
                    list:[‘width‘,‘height‘,‘border‘]
                },
                methods:{
                    add(){
                        this.list.push(‘background‘);
                    }
                }
            });
        };
    </script>
</head>
<body>
    <div id="box">
        <input type="button" value="添加" @click="add">
        <ul>
            <li v-for="(val,index) in list">
                {{val}} {{index}}
            </li>
        </ul>
    </div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>智能社——http://www.zhinengshe.com</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <style>

    </style>
    <script src="vue.js"></script>
    <script>
        window.onload=function(){
            new Vue({
                el:‘#box‘,
                data:{
                    list:{//json
                        a:‘apple‘,
                        b:‘banana‘,
                        c:‘cell‘
                    }
                },
                methods:{
                }
            });
        };
    </script>
</head>
<body>
    <div id="box">
        <input type="button" value="添加">
        <ul>
            <li v-for="(val,key) in list">
                {{val}} {{key}}
            </li>
        </ul>
    </div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>智能社——http://www.zhinengshe.com</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <style>

    </style>
    <script src="vue.js"></script>
    <script>
        window.onload=function(){
            new Vue({
                el:‘#box‘,
                data:{
                    list:[‘width‘,‘height‘,‘border‘]
                },
                methods:{
                    add(){
                        this.list.push(‘background‘);
                    }
                }
            });
        };
    </script>
</head>
<body>
    <div id="box">
        <input type="button" value="添加" @click="add">
        <ul>
            <li v-for="(val,index) in list" :key="index">
                {{val}} {{index}}
            </li>
        </ul>
    </div>
</body>
</html>

 

vue26-2.0循环


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