# directive 用法
TIP 官方文档：https://cn.vuejs.org/v2/api/#Vue-directive
<html>
<head>
<title>directive 用法</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="root">
<div v-loading="isLoading">{{data}}</div>
<button @click="update">更新</button>
</div>
<script>
Vue.directive('loading', {
update(el, binding, vnode) {
if (binding.value) {
const div = document.createElement('div')
div.innerText = '加载中...'
div.setAttribute('id', 'loading')
div.style.position = 'absolute'
div.style.left = 0
div.style.top = 0
div.style.width = '100%'
div.style.height = '100%'
div.style.display = 'flex'
div.style.justifyContent = 'center'
div.style.alignItems = 'center'
div.style.color = 'white'
div.style.background = 'rgba(0, 0, 0, .7)'
document.body.append(div)
} else {
document.body.removeChild(document.getElementById('loading'))
}
}
})
new Vue({
el: '#root',
data() {
return {
isLoading: false,
data: ''
}
},
methods: {
update() {
this.isLoading = true
setTimeout(() => {
this.data = '用户数据'
this.isLoading = false
}, 3000)
}
}
})
</script>
</body>
</html>
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