@click vs onclick

onclick可以由JS引擎直接识别，在全局寻找对应处理方法。
@click是vue语法糖，由vue在自己的methods里寻找对应处理方法。

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
    <script src="https://cdn.staticfile.org/vue/2.4.2/vue.min.js"></script>
    <script src="https://unpkg.com/element-ui/lib/index.js"></script>
</head>

<body>
    <div id="app">
        <button @click="vueClick()">vueClick</button>
        <button onclick="domClick()">domClick</button>
    </div>
    <script>
        const app = new Vue({
            el: "#app",
            data() {
                return {
                    visible: false
                }
            },
            methods: {
                vueClick() {
                    console.log("vueClick");
                },
                domClick() {
                    console.log("domClick");
                }
            }
        })

        function vueClick() {
            alert("vueClick");
        }

        function domClick() {
            alert("domClick");
        }
    </script>
</body>

</html>
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结果：打印vueClick、警告domClick