事件绑定与修饰符

1 事件绑定
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <!-- 绑定click事件到search() -->
        <button v-on:click="search()">
            search
        </button>
        <!-- 简写:绑定click事件到find() -->
        <button @click="find()">find</button>
    </div>

    <script src="vue.min.js"></script>

    <script>
        new Vue({
            el: '#app',
            data: { //无关紧要的数据
                result:"result"
            },
            methods:{ 
                search(){
                    console.log("search...");
                },
                find() {
                    console.log("find...");
                }
            }
        })
    </script>
</body>

</html>
2 修饰符

修饰符其实是狸猫换***，阻止事件绑定的行为，转为指定的行为。其实有点类似于java中的拦截器，或者增强，具体参考下列代码。

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <!-- 修饰符将组织submit执行，转而执行onsubmit -->
        <form action="save" v-on:submit.prevent="onsubmit">
            <input type="text" v-model="user.username">
            <!-- button按钮的效果是执行submit -->
            <button type="submit">保存</button>
        </form>
    </div>
    <script src="vue.min.js"></script>
    <script>
        new Vue({
            el: '#app',
            data: {
                user:{}
            },
            methods:{
                onsubmit(){
                    if(this.user.username) {
                        console.log("save successfully!")
                    } else{
                        alert("please input the user name.");
                    }
                }
            }
        })
    </script>
</body>

</html>