vue中的自定义指令通过Vue.directive来实现,主要完成内置指令不能完成的一些事情
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Vue入门之自定义指令</title>
<script src=/Other/doc/vue-family/"https_/cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>/index.html
</head>
<body>
<div id="app">
<div v-test="color">
{{num}}
</div>
</div>
<button onclick="unbindApp()">解绑</button>
<script type="text/javascript">
// 解绑
function unbindApp() {
app.$destroy();
}
// 自定义指令
Vue.directive("test",{
//1-被绑定
bind:function (el, binding, vnode) {
console.log("1-bind 被绑定");
console.log("el:",el);
console.log("binding:",binding);
console.log("vnode:",vnode);
el.style.color = binding.value;
},
//2-被插入
inserted:function (el, binding, vnode) {
console.log("2-inserted 被插入");
},
//3-更新
update:function (el, binding, vnode) {
console.log("3-update 更新");
},
//4-更新完成
componentUpdated:function (el, binding, vnode) {
console.log("4-componentUpdated 更新完成");
},
//5-解绑
unbind:function (el, binding, vnode) {
console.log("5-unbind 解绑");
}
});
var app = new Vue({
el:'#app',
data:{
num: 123,
color:'red'
}
})
</script>
</body>
</html>
(1)chrome打开控制器查看
(2)控制台输入“app.num=’通过控制台设置的新name’”
(3)点击解绑按钮
自定义指令有五个生命周期(也叫钩子函数),分别是bind、inserted、update、componentUpdated、unbind,说明如下: