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<!DOCTYPE html>
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<title> Chelseasc </title>
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<h1 class="post-title">
<a class="post-link" href="/2018/05/21/倒计时返回/"></a>
</h1>
<div class="post-meta">
<span class="post-time">
2018-05-21
</span>
</div>
</header>
<div class="post-content">
<p>title: 倒计时返回<br>date: 2017-04-01 20:36:00</p>
<h2 id="categories-JS"><a href="#categories-JS" class="headerlink" title="categories: JS"></a>categories: JS</h2><p>模仿一下工行app里倒计时返回的效果，倒计时结束按钮才可用</p>
<p><img src="http://oyd0q85o6.bkt.clouddn.com/setInterval.gif" alt="image"></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line">//默认不可点击</span><br><span class="line"><div class="title"></span><br><span class="line"> <a href="http://baidu.com" onclick="return false;" class="modal-ok"></span><br><span class="line"> >返回<span id="set_time">(10s)</span></span><br><span class="line"> </a></span><br><span class="line"></div></span><br><span class="line"> </span><br><span class="line"></span><br><span class="line"><script></span><br><span class="line"> /**</span><br><span class="line"> *计时器</span><br><span class="line"> */</span><br><span class="line"> var $set_time = $("#set_time");</span><br><span class="line"> var i = 10; //初始化倒计时秒数</span><br><span class="line"> var timer = setInterval(function () {</span><br><span class="line"> i--;</span><br><span class="line"> $set_time.text("(" + i + "s)");</span><br><span class="line"> if (i < 1) { //倒计时结束</span><br><span class="line"> $set_time.text("");</span><br><span class="line"> $set_time.parent(".modal-ok").css({ "background": "#0187d6", "color": "#fff", "border": "1px solid #0187d6" });</span><br><span class="line"> $set_time.parent(".modal-ok").removeAttr('onclick', 'return false;');</span><br><span class="line"> clearInterval(timer); //清楚计时器</span><br><span class="line"> }</span><br><span class="line"> }, 1000);</span><br><span class="line"></script></span><br></pre></td></tr></table></figure>
<p>setInterval()函数会不停的调用函数，直到执行clearInterval()为止才会终止。</p>
</div>
</article>
<article class="post">
<header class="post-header">
<h1 class="post-title">
<a class="post-link" href="/2018/03/05/两种方式给input输入的值转换为大写（或小写）/">两种方式给input输入的值转换为大写（或小写）</a>
</h1>
<div class="post-meta">
<span class="post-time">
2018-03-05
</span>
<div class="post-category">
<a href="/categories/vue/">vue</a>
</div>
</div>
</header>
<div class="post-content">
<p>1.事件</p>
<p>input里 加v-on:input=”handleFocus”</p>
<div class="read-more">
<a href="/2018/03/05/两种方式给input输入的值转换为大写（或小写）/" class="read-more-link">阅读更多</a>
</div>
</div>
</article>
<article class="post">
<header class="post-header">
<h1 class="post-title">
<a class="post-link" href="/2018/03/03/scoped/">scoped属性及css作用域问题</a>
</h1>
<div class="post-meta">
<span class="post-time">
2018-03-03
</span>
<div class="post-category">
<a href="/categories/vue/">vue</a>
</div>
</div>
</header>
<div class="post-content">
<p>在Vue中，使用scoped后父组件的样式不会渗透到子组件中。</p>
<p>scoped虽然在某些情况下会降低css解析效率，但是它可以优雅的实现样式私有化，它通过使用PostCSS(github上的介绍：PostCSS is a tool for transforming CSS with JS plugins. These plugins can support variables and mixins, transpile future CSS syntax, inline images, and more.)来实现转换，效果如下：</p>
<div class="read-more">
<a href="/2018/03/03/scoped/" class="read-more-link">阅读更多</a>
</div>
</div>
</article>
<article class="post">
<header class="post-header">
<h1 class="post-title">
<a class="post-link" href="/2018/03/01/属性覆盖/">JS对象的属性覆盖</a>
</h1>
<div class="post-meta">
<span class="post-time">
2018-03-01
</span>
<div class="post-category">
<a href="/categories/JS/">JS</a>
</div>
</div>
</header>
<div class="post-content">
<p> 在js中每个对象都有一个私有属性（[[Prototype]]），并指向它的原型对象（prototype），这个原型对象也有自己的prototype，层层向上直到指向的原型为null。</p>
<p> 何为属性覆盖呢？先来看一组现象：<br>
<div class="read-more">
<a href="/2018/03/01/属性覆盖/" class="read-more-link">阅读更多</a>
</div>
</div>
</article>
<article class="post">
<header class="post-header">
<h1 class="post-title">
<a class="post-link" href="/2018/01/23/element-ui Tree树形控件清空勾选项/">element-ui Tree树形控件清空勾选项</a>
</h1>
<div class="post-meta">
<span class="post-time">
2018-01-23
</span>
<div class="post-category">
<a href="/categories/vue/">vue</a>
</div>
</div>
</header>
<div class="post-content">
<p>现在有一个需求是清除Tree里已选项，简单的方法就是反选，再保存就好了。但是这样做很显然产品经理是不会同意的 (?⊙? ⊙?)，下面的方式可以实现一键清除。</p>
<p><img src="http://oyd0q85o6.bkt.clouddn.com/element-tree.png" alt="image"><br>
<div class="read-more">
<a href="/2018/01/23/element-ui Tree树形控件清空勾选项/" class="read-more-link">阅读更多</a>
</div>
</div>
</article>
<article class="post">
<header class="post-header">
<h1 class="post-title">
<a class="post-link" href="/2018/01/03/Maximum Continuous Subsequence Sum/">【数据结构与算法】最大子序列和</a>
</h1>
<div class="post-meta">
<span class="post-time">
2018-01-03
</span>
<div class="post-category">
<a href="/categories/数据结构/">数据结构</a>
</div>
</div>
</header>
<div class="post-content">
<p>最大子序列和</p>
<p>方法一：暴力 O(N3)</p>
<p>算出所有子列和，再求最大的</p>
<div class="read-more">
<a href="/2018/01/03/Maximum Continuous Subsequence Sum/" class="read-more-link">阅读更多</a>
</div>
</div>
</article>
<article class="post">
<header class="post-header">
<h1 class="post-title">
<a class="post-link" href="/2017/10/23/vue数据添加单个删除批量删除/">vue.js之数据添加、单个删除和批量删除</a>
</h1>
<div class="post-meta">
<span class="post-time">
2017-10-23
</span>
<div class="post-category">
<a href="/categories/vue/">vue</a>
</div>
</div>
</header>
<div class="post-content">
<p>如图所示，我们要分别实现一个实际应用中非常常见的功能： 数据动态添加、重置、单个删除和整个删除，且删除之前出现提示框确认是否删除。（结合了<strong>bootstrap</strong>）</p>
<p><img src="http://oyd0q85o6.bkt.clouddn.com/vue02.gif" alt="vue02"></p>
<div class="read-more">
<a href="/2017/10/23/vue数据添加单个删除批量删除/" class="read-more-link">阅读更多</a>
</div>
</div>
</article>
<article class="post">
<header class="post-header">
<h1 class="post-title">
<a class="post-link" href="/2016/09/12/奇技淫巧：中缀表达式&前缀后缀表达式/">奇技淫巧：中缀表达式&前缀后缀表达式</a>
</h1>
<div class="post-meta">
<span class="post-time">
2016-09-12
</span>
<div class="post-category">
<a href="/categories/数据结构/">数据结构</a>
</div>
</div>
</header>
<div class="post-content">
<p>不推荐 但可以提高考试效率的技巧：</p>
<p>问：写出a+b*c-d/e的前缀及后缀表达式</p>
<p>前缀解法：</p>
<ol>
<li>按照运算符的优先级对所有的运算单位加括号，于是得到 ( (a+ (b*c) ) - (d/e) )</li>
<li>把运算符移到对应括号前面，得到 -( +*(a (bc) ) /(de) )</li>
<li>去掉所有成对的括号，得到 - +*a bc /de 即前缀表达式</li>
</ol>
<p>后缀解法：</p>
<ol>
<li>按照运算符的优先级对所有的运算单位加括号，于是得到 ( (a+ (b*c) ) - (d/e) )</li>
<li>把运算符移到对应括号后面，得到 ( (a (bc) * ) + (de)/ )-</li>
<li>去掉所有成对的括号，得到 a bc *+ de/- 即后缀表达式</li>
</ol>
</div>
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