<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>自定义指令</title>
<script type="text/javascript" src="../vue.js"></script>
</head>
<body>
<div id="root">
<h2>当前的n值是：<span v-text="n"></span></h2>
<h2>放大10倍的n值是：<span v-big="n"></span></h2>
<button @click="n++">n+1</button>
<hr/>
<input type="text" v-fbind:value="n" >
</div>
<script type="text/javascript">
Vue.config.productionTip = false // 组织开发环境提示
// 创建Vue实例
const x = new Vue({
el: '#root',
data: {
n: 1,
},
directives: {
// big函数何时会被调用？1.指令与元素成功绑定时；2.指令所在模板被重新解析时
big(element, binding) {
element.innerText = binding.value * 10
},
fbind: {
// 绑定时调用
bind(element, binding){
element.value = binding.value
},
// 渲染时调用
inserted(element, binding){
element.focus()
},
// 重新渲染时调用
update(element, binding){
element.value = binding.value
element.focus()
}
}
}
})
</script>
</body>
</html>