自定义指令
加载或刷新页面时直接获取焦点
<!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>
</head>
<body>
<div id="app">
<input ref="inp" type="text">
<button>搜索</button>
</div>
<script src="https://unpkg.com/vue@next"></script>
<script>
const app = Vue.createApp({
mounted(){//要拿到dom，所以必须是mounted
this.$refs.inp.focus();//获取input的dom节点并聚焦
}
});
app.mount("#app")
</script>
</body>
</html>
但每次这么写比较麻烦，可以用自定义指令的方式
以下的vue自带的指令
<!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>
</head>
<body>
<div id="app">
<input v-focus type="text">
<button>搜索</button>
</div>
<script src="https://unpkg.com/vue@next"></script>
<script>
const app = Vue.createApp({});
app.directive("focus",{//自定义指令 第一个参数是指令名
mounted(el){//el是挂载这个指令的dom节点
el.focus();//聚焦
}
})
app.mount("#app")
</script>
</body>
</html>
