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<ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#vue的实例对象与生命周期"><span class="post-toc-number">1.</span> <span class="post-toc-text">vue的实例对象与生命周期</span></a></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#实例对象"><span class="post-toc-number">2.</span> <span class="post-toc-text">实例对象</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#data"><span class="post-toc-number">2.1.</span> <span class="post-toc-text">data</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#computed"><span class="post-toc-number">2.2.</span> <span class="post-toc-text">computed</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#介绍"><span class="post-toc-number">2.2.1.</span> <span class="post-toc-text">介绍</span></a></li></ol></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#methods"><span class="post-toc-number">2.3.</span> <span class="post-toc-text">methods</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#watch"><span class="post-toc-number">2.4.</span> <span class="post-toc-text">watch</span></a></li></ol></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#总结"><span class="post-toc-number">3.</span> <span class="post-toc-text">总结</span></a></li></ol>
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vue学习笔记
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<strong>Feax</strong>
<span>6月 18, 2017</span>
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<h2 id="vue的实例对象与生命周期"><a href="#vue的实例对象与生命周期" class="headerlink" title="vue的实例对象与生命周期"></a>vue的实例对象与生命周期</h2><ul>
<li><p>beforeCreate</p>
<blockquote>
<p>在实例初始化之后,数据观测(data observer) 和 event/watcher 事件配置之前被调用。</p>
</blockquote>
</li>
<li><p>created</p>
<blockquote>
<p>实例已经创建完成之后被调用。在这一步,实例已完成以下的配置:数据观测(data observer),属性和方法的运算, watch/event 事件回调。然而,挂载阶段还没开始,$el 属性目前不可见。</p>
</blockquote>
</li>
<li><p>beforeMount</p>
<blockquote>
<p>在挂载开始之前被调用:相关的 render 函数首次被调用。</p>
</blockquote>
</li>
<li><p>mounted</p>
<blockquote>
<p>el 被新创建的 vm.$el 替换,并挂载到实例上去之后调用该钩子。如果 root 实例挂载了一个文档内元素,当 mounted 被调用时 vm.$el 也在文档内。</p>
</blockquote>
</li>
<li><p>beforeUpdate</p>
<blockquote>
<p>数据更新时调用,发生在虚拟 DOM 重新渲染和打补丁之前。 你可以在这个钩子中进一步地更改状态,这不会触发附加的重渲染过程。</p>
</blockquote>
</li>
<li><p>updated</p>
<blockquote>
<p>由于数据更改导致的虚拟 DOM 重新渲染和打补丁,在这之后会调用该钩子。<br>当这个钩子被调用时,组件 DOM 已经更新,所以你现在可以执行依赖于 DOM 的操作。然而在大多数情况下,你应该避免在此期间更改状态,因为这可能会导致更新无限循环。<br>该钩子在服务器端渲染期间不被调用。</p>
</blockquote>
</li>
<li><p>beforeDestroy</p>
<blockquote>
<p>实例销毁之前调用。在这一步,实例仍然完全可用。</p>
</blockquote>
</li>
<li><p>destroyed</p>
<blockquote>
<p>Vue 实例销毁后调用。调用后Vue 实例指示的所有东西都会解绑定,所有的事件监听器会被移除,所有的子实例也会被销毁。 该钩子在服务器端渲染期间不被调用。</p>
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<h2 id="实例对象"><a href="#实例对象" class="headerlink" title="实例对象"></a>实例对象</h2><h3 id="data"><a href="#data" class="headerlink" title="data"></a>data</h3><ul>
<li>类型是Object或者Function。<pre><code class="js">&gt; var vm = new Vue({
data: data
})
</code></pre>
</li>
</ul>
<h3 id="computed"><a href="#computed" class="headerlink" title="computed"></a>computed</h3><h4 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h4><p>Vue的计算属性computed)的属性会自动混入Vue的实例中。所有 getter 和 setter 的 this 上下文自动地绑定为 Vue 实例。这就很强大了,再计算属性中定义的函数里面可以直接使用指向了 vue 实例的 this</p>
<h3 id="methods"><a href="#methods" class="headerlink" title="methods"></a>methods</h3><ul>
<li>类型: { [key: string]: Function }</li>
</ul>
<p>methods 将被混入到 Vue 实例中。可以直接通过 VM 实例访问这些方法,或者在指令表达式中使用。方法中的 this 自动绑定为 Vue 实例。</p>
<h3 id="watch"><a href="#watch" class="headerlink" title="watch"></a>watch</h3><ul>
<li>类型: { [key: string]: string | Function | Object }</li>
</ul>
<p>一个对象键是需要观察的表达式值是对应回调函数。值也可以是方法名或者包含选项的对象。Vue 实例将会在实例化时调用 $watch(),遍历 watch 对象的每一个属性。</p>
<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>Vue的实例封装的还是挺有艺术性的很符合开发者的思维规范它的生命周期也非常清晰使用起来也非常方便。MVVM双向绑定思想也是吊的可以</p>
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