三种指令
系统指令
自定义全局指令
自定义局部指令
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<p ref="pTag">Hello Vue</p>
<button @click="hint">Click</button>
<br>
<p v-upper-text="msg"></p>
<p v-lower-text="msg"></p>
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.5.0/vue.js"></script>
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/moment.js/2.29.1/moment.js"></script>
<script>
//自定义全局指令
Vue.directive('upper-text',function(el,bingding) {
el.innerHTML = bingding.value.toUpperCase()
})
new Vue({
el:"#app",
data:{
msg:'I Love You ! Hello Vue '
},
// 局部自定义指令
directives:{
'lower-text':function(el,bingding){
el.textContent = bingding.value.toLowerCase()
}
},
methods: {
hint(){
// 内置指令
alert(this.$refs.pTag.innerHTML)
}
}
})
</script>
</body>
</html>