console
<!DOCTYPE html>
<html lang="en">
<head>
<title>Vue.directive 自定义指令</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.21/dist/vue.js">
</script>
</head>
<body>
<h1>Vue.directive 自定义指令</h1>
<hr>
<div id="app">
<div v-jsdirective="color">{{num}}</div>
<p><button @click="add">Add</button></p>
</div>
<p><button onclick="unbind()">解绑</button></p>
<script type="text/javascript">
function unbind(params) {
app.$destroy();
}
// jsdirective标识v-jsdirective会自动省略v-
// el表示所在元素<div>10</div>
// binding是一个对象，包含元素未处理前的很多值
Vue.directive("jsdirective", {
bind: function (el, binding) { //被绑定
console.log('1 - bind');
console.log(el);
console.log(binding);
console.log(binding.name);
console.log(binding.rawName);
console.log(binding.value);
console.log(binding.expression);
el.style = "color:" + binding.value;
},
inserted: function () { //绑定到节点
console.log('2 - inserted');
},
update: function () { //组件更新
console.log('3 - update');
},
componentUpdated: function () { //组件更新完成
console.log('4 - componentUpdated');
},
unbind: function () { //解绑
console.log('5 - unbind');
}
})
var app = new Vue({
el: '#app',
data: {
num: 10,
color: "red",
},
methods: {
add: function () {
this.num++;
}
},
})
</script>
</body>
</html>