index.html

---
layout: page
title: ZFX的学习笔记
description: "向着目标前进，加油"
header-img: "/img/home-bg.jpg"
---

<!-- 网站主页 -->
{% for post in paginator.posts %}
<div class="post-preview">
    <a href="{{ post.url | prepend: site.baseurl }}">
        <h2 class="post-title">
            {{ post.title }}
        </h2>
        {% if post.subtitle %}
        <h3 class="post-subtitle">
            {{ post.subtitle }}
        </h3>
        {% endif %}
		{% if post.description %}
        <div class="post-content-preview">
            {% if post.description %}
			{{ post.description }}
			{% endif %}
        </div>
		{% endif %}
    </a>
    <p class="post-meta">
        发表时间：{{ post.date | date: "%Y-%m-%d" }}&nbsp;浏览量：<span id="{{ post.url }}" class="leancloud_visitors" data-flag-title="{{ post.title }}"> - </span>次.&nbsp;字数：{{ post.content | number_of_words }}
    </p>
</div>
<hr>
{% endfor %}
<script src="//unpkg.com/leancloud-storage@4.12.2/dist/av-min.js"></script>
<script>
    AV.init({
      appId: "b6xbX21qO1uIQJAVuRHfOXQe-gzGzoHsz",
      appKey: "Dx4XP9hYgFhPhBsPEjf50Is0",
      serverURL: "https://leancloud.zfxkj.top"
    });
    var name='Counter';

    function createRecord(Counter){
      // 设置 ACL
      var acl = new AV.ACL();
      acl.setPublicReadAccess(true);
      acl.setPublicWriteAccess(true);
      // 获得span的所有元素
      var elements=document.getElementsByClassName('leancloud_visitors');
      // 一次创建多条记录
      var allcounter=[];
      for (var i = 0; i < elements.length ; i++) {
        // 若某span的内容不包括 '-' ，则不必创建记录
        if(elements[i].textContent.indexOf('-') == -1){
          continue;
        }
        var title = elements[i].getAttribute('data-flag-title');
        var url = elements[i].id;

        var newcounter = new Counter();
        newcounter.setACL(acl);
        newcounter.set("title", title);
        newcounter.set("url", url);
        newcounter.set("time", 0);

        allcounter.push(newcounter);
        // 顺便更新显示span为默认值0
        elements[i].textContent=0;
      }
      // 判断是否需要新建记录
      if(allcounter.length == 0){
        return;
      }
      AV.Object.saveAll(allcounter).then(function (todo) {
        // 成功保存记录之后
        console.log('创建记录成功！');
      }, function (error) {
        // 异常错误 
        console.error('创建记录失败: ' + error.message);
      });
    }

    function showCount(Counter){
      // 是否需要创建新纪录的标志（添加一篇新文章）
      var flag=false;
      var query = new AV.Query(name);
      query.greaterThanOrEqualTo('time', 0);
      query.find().then(function (results) {
        // 当获取到的记录为0时置默认值
        if(results.length==0){
          $('.leancloud_visitors').text('-');
          flag=true;
          console.log('返回查询记录为空');
          // 如果获取到空记录就创建新记录
          createRecord(Counter);
          return;
        }
        // 将获取到的数据设置为text
        for (var i = 0; i < results.length; i++) {
          var item = results[i];
          var url = item.get('url');
          var time = item.get('time');
          try {
            var element = document.getElementById(url);
            // 删除原字符串中的空格
            if(element.textContent.replace(/\s+|&nbsp;/ig,'') == '-' || parseInt(element.textContent) < time){
              element.textContent = time;
            }
          } catch (error) {
            // console.log("获取"+url+"的网页元素出错："+error);
          }
        }
        // 当某个span含有默认值时说明需要创建记录
        if($('.leancloud_visitors').text().indexOf("-") != -1){
          flag=true;
        }
        // 当获取的记录数与span个数不吻合时
        if(results.length != $('.leancloud_visitors').length){
          flag=true;
        }
        if(flag){
          createRecord(Counter);
        }
      }, function (error) {
        console.log('query error:'+error.message);
      });
    }

    $(function() {
      var Counter = AV.Object.extend(name);
      showCount(Counter);
    });
</script>

<!-- Pager -->
<ul class="pager">

  {% if paginator.previous_page %}
  <li class="home previous">
    {% if paginator.previous_page == 1 %}
    <a href="{{ site.BASE_PATH }}/">&larr; 上一页</a>
    {% else %}
    <a href="{{ site.BASE_PATH }}/{{ site.paginate_path | replace: ':num', paginator.previous_page }}">&larr; 上一页</a>
    {% endif %}
  </li>
  {% else %}
  <li class="home previous disabled">
    <a>&larr; 上一页</a>
  </li>
  {% endif %}

  <li>
    <span class="page_number">页面: {{ paginator.page }} of {{ paginator.total_pages }}</span>
  </li>

  {% if paginator.next_page %}
  <li class="home next">
    <a href="{{ site.BASE_PATH }}/{{ site.paginate_path | replace: ':num', paginator.next_page }}">下一页 &rarr;</a>
  </li>
  {% else %}
  <li class="home next disabled">
    <a>下一页 &rarr;</a>
  </li>
  {% endif %}

</ul>

<br>