实例生命周期
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var vm = new Vue({
data: {
a: 1
},
created: function () {
// `this` 指向 vm 实例
console.log('a is: ' + this.a)
}
})
// -> "a is: 1"
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There are also other hooks which will be called at different stages of the instance’s lifecycle, for example mounted, updated, and destroyed. All lifecycle hooks are called with their this context pointing to the Vue instance invoking it. You may have been wondering where the concept of “controllers” lives in the Vue world and the answer is: there are no controllers. Your custom logic for a component would be split among these lifecycle hooks.
也有一些其它的钩子，在实例生命周期的不同阶段调用，如 mounted、 updated 、destroyed 。钩子的 this 指向调用它的 Vue 实例。一些用户可能会问 Vue.js 是否有“控制器”的概念？答案是，没有。组件的自定义逻辑可以分布在这些钩子中。
生命周期图示
下图说明了实例的生命周期。你不需要立马弄明白所有的东西，不过以后它会有帮助。
