给文章的高亮代码加上点击运行

发表于

为了方便在文章插入一些简单的前端代码可以直接运行，加上一个点击运行的按钮；另一方面也让自己好好写写代码 。

效果如下

  • 鼠标放上去会显示出运行的按钮
  • 点击运行单个：运行当前的代码块
  • 点击运行全部：会同时载入文章中所有的代码块
  • 点击运行同组：会运行连续的兄弟代码块

ps: 只在详情页显示运行按钮!! 写这几行 ES5 的代码真不容易 !!

测试分组第一组：

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<div class="test">
    <h1 class="ymm">嘿嘿嘿嘿</h1>
    <h2>HTML 功能测试</h2>
    <button id="button">我是 Button1</button>
</div>
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.ymm {
    color: red;
}
.test {
    position: relative;
    padding: 20px;
    background-color: #ccc;
}
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// button1
var a = '1111';
setTimeout(() => {
    console.log(`独立作用域：a = ${a}`);
}, 200);
document.getElementById('button').addEventListener('click', function() {
    alert('Button1 (*^▽^*)');
    console.log('Button1 (*^▽^*)');
});
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测试分组第二组：

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<div class="test">
    <h2>多个HTML 节点测试 </h2>
    <button id="button2">我是 Button2</button>
</div>
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// button2
var a = '22222';
setTimeout(() => {
    console.log(`独立作用域：a = ${a}`);
}, 200);
document.getElementById('button2').addEventListener('click', function() {
    alert('Button2 (*^▽^*)');
    console.log('Button2 (*^▽^*)');
});
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使用

实现：

  1. 通过遍历对应的代码块，提取代码字符串，
  2. open一个新窗口把需要执行的代码加进去
  3. 新窗口内注入一个自定义js用来解析需要执行的代码，也可以自己eval执行

页面执行：

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var onlineRun = {
  init: function () {
    var domList = this.getAllHighlightJqDom();
    var that = this;

    // 创建btn按钮
    if (domList.length > 0) {
      this.insertBtnCss();
      domList.each(function(index, dom) {
        that.createBtn(dom);
      });

      this.bindEvents();
    }
  },

  insertStyleCode: function(code) {
    var style = window.document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = code;
    window.document.getElementsByTagName('head').item(0).appendChild(style);
  },

  insertBtnCss: function () {
    var cssCode = '.runBtn{position: absolute;bottom: 5px; right: 5px; margin-left: 20px;width: 60px; text-align: center; background: #000;font-size: 12px; cursor: pointer; opacity: 0;color:#FFF;transition: 0.3s ease;visibility: hidden;}';
    cssCode += '.runBtn:hover{opacity: 1!important;}';
    cssCode += '.highlight:hover .runBtn{opacity: 0.4;visibility: visible;}';
    this.insertStyleCode(cssCode);
  },

  getCode: function (jqDom) {
    var codeArr = [];
    // 兼容 数组
    var addItem = function (item) {
      var type = item.className.replace(/highlight\s+/, '');
      codeArr.push({
        type: type,
        code: $(item).find('.code')[0].innerText
      });
    };
    if (jqDom instanceof Array) {
      jqDom.forEach(function (item) {
        addItem(item);
      });
    } else {
      jqDom.each(function (index, item) {
        addItem(item);
      });
    }

    return codeArr;
  },
  runCodeFn: function (codeObj) {
    var openWindow = window.open("", "", "");
    openWindow.opener = null; // 父级窗口

    // 插入vConsole / jQuery、layer
    var scripts = ['https://cdn.bootcss.com/vConsole/3.3.4/vconsole.min.js', window.libUri.jquery, window.libUri.layer];
    var promiseArr = scripts.map(function (item) {
      return window.loadScript(item, {
        async: false,
        container: openWindow
      });
    });

    // 保证公共js 先执行完
    window.Promise.all(promiseArr).then(function () {
      codeObj = [
        {
          type: 'charset',
          code: 'utf-8',
        },{
          type: 'link',
          code: 'https://cdn.bootcss.com/normalize/8.0.1/normalize.min.css',
        },{
          type: 'link',
          code: window.libUri.customCssUri,
        }
      ].concat(codeObj);

      // 插入待执行代码字符串
      var jsCode = openWindow.document.createElement('script');
      jsCode.text = 'var runCodeObj = ' +  JSON.stringify(codeObj);
      openWindow.document.body.appendChild(jsCode);

      // 加载自定义js
      window.loadScript(window.libUri.customJsUri, {
        async: false,
        container: openWindow
      });
      openWindow.document.title = '在线运行';
      openWindow.document.close();
    });
  },
  bindEvents: function () {
    var that = this;
    $(window.document).on('click', '.js_runItem', function () {
      var codeObj = that.getCode($(this).parent());
      that.runCodeFn(codeObj);
    });
    $(window.document).on('click', '.js_runAllItem', function () {
      var codeObj = that.getCode(that.getAllHighlightJqDom());
      that.runCodeFn(codeObj);
    });
    $(window.document).on('click', '.js_runNearItem', function (event) {
      var codeObj = that.getCode(that.getNearHighlightJqDom($(event.currentTarget).parent()));
      that.runCodeFn(codeObj);
    });
  },
  getNearHighlightJqDom: function($currentCodeBlock) {
    // 获取附近的可运行高亮代码
    var checkDom = function ($dom) {
      return $dom.hasClass('js') || $dom.hasClass('css') || $dom.hasClass('html');
    };

    var nodeArr = [$currentCodeBlock[0]];
    // 向下查找
    var $next = $currentCodeBlock.next();
    while ($next.length > 0) {
      if (checkDom($next)) {
        nodeArr.push($next[0]);
        // $currentCodeBlock.add($next); // todo: 无法add ?
        $next = $next.next();
      } else {
        break;
      }
    }

    // 向上查找
    var $perv = $currentCodeBlock.prev();
    while ($perv.length > 0) {
      if (checkDom($perv)) {
        nodeArr.unshift($perv[0]); // 保持顺序
        // $currentCodeBlock.add($perv[0]);
        $perv = $perv.prev();
      } else {
        break;
      }
    }

    return nodeArr;
  },
  getAllHighlightJqDom: function() {
    // css html js
    if (!this.highlightList) {
      this.highlightList = $('.highlight.css, .highlight.js, .highlight.html');
    }
    return this.highlightList;
  },
  createBtn: function (parentDom) {
    var btns = [
      {
        className: 'runBtn runNearItem js_runNearItem',
        text: '运行同组',
        title: '运行当前代码块以及连续的兄弟代码块',
      },
      {
        className: 'runBtn runAllBtn js_runAllItem',
        text: '运行全部',
        title: '运行所有代码块',
      },
      {
        className: 'runBtn js_runItem',
        text: '运行单个',
        title: '运行当前代码块',
      }
    ];

    var tempFragment = window.document.createDocumentFragment();
    btns.forEach(function (item, index) {
      var btnItemDom = window.document.createElement('span');
      btnItemDom.className = item.className;
      btnItemDom.title = item.title;
      btnItemDom.innerText = item.text;
      btnItemDom.style.bottom = 25 * index + 'px';
      tempFragment.appendChild(btnItemDom);
    });

    parentDom.style.position = 'relative';
    parentDom.appendChild(tempFragment);
  }
};

// 需要的时候执行这个
// onlineRun.init();
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新窗口执行：

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/**
 * Created by Liu.Jun on 2019/11/9 12:38 上午.
 */

// from: https://github.com/jserz/js_piece/blob/master/DOM/ParentNode/prepend()/prepend().md
(function (arr) {
  arr.forEach(function (item) {
    item.prepend = item.prepend || function () {
      var argArr = Array.prototype.slice.call(arguments),
        docFrag = document.createDocumentFragment();

      argArr.forEach(function (argItem) {
        var isNode = argItem instanceof Node;
        docFrag.appendChild(isNode ? argItem : document.createTextNode(String(argItem)));
      });

      this.insertBefore(docFrag, this.firstChild);
    };
  });
})([Element.prototype, Document.prototype, DocumentFragment.prototype]);

var MyFragment = function (parentDom) {
  this.fragment = window.document.createDocumentFragment();
  this.parentDom = String(parentDom) === parentDom ? window.document.getElementsByTagName(parentDom).item(0) : parentDom;
};
MyFragment.prototype.append = function (dom) {
  this.fragment.appendChild(dom);
};
MyFragment.prototype.prepend = function (dom) {
  this.fragment.prepend(dom);
};

MyFragment.prototype.insertPage = function () {
  this.parentDom.appendChild(this.fragment);
};

var genCodeStrategy = {
  charset: function() {
    var meta = window.document.createElement('meta');
    meta.content = 'text/html;charset=utf-8';
    return meta;
  },
  css: function (code) {
    var style = window.document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = code;
    return style;
  },
  js: function (code) {
    var js = window.document.createElement('script');
    // 各代码块独立作用域
    js.text = code;
    return js;
  },
  script: function (src) {
    var script = window.document.createElement('script');
    script.src = src;
    return script;
  },
  link: function(href) {
    var link = window.document.createElement('link');
    link.href = href;
    link.rel = 'stylesheet';
    link.type = 'text/css';
    return link;
  },
  html: function (code) {
    var dom = window.document.createElement('div');
    dom.classList.add('section');
    dom.innerHTML = code;
    return dom;
  }
};

var customObj = {
  init: function(runCodeObj) {
    this.layerId = null;

    this.initDoctype();

    this.fragmentObj = this.initRunCode(runCodeObj);

    // 头部代码同步先插入
    this.fragmentObj.headFragment.insertPage();

    // 初始化 vConsole
    this.vConsole = this.initConsole();
    this.vConsole.hideSwitch();

    this.openConsole();
    this.vConsole.show();

    // JS 等部分需要后执行
    this.fragmentObj.bodyFragment.insertPage();

    // 底部按钮
    this.insertSwitchBtn();
  },
  initDoctype: function() {
    // prepend polyfill IE不兼容
    window.document.insertBefore(window.document.implementation.createDocumentType('html', '', ''), window.document.documentElement);
  },
  insertSwitchBtn: function() {
    var that = this;
    var btn = window.document.createElement('span');
    btn.className = 'vc-switch showConsole';
    btn.innerText = 'vConsole';
    window.document.getElementById('__vconsole').appendChild(btn);

    $(btn).on('click', function () {
      if (that.layerId) {
        window.layer.close(that.layerId);
      } else {
        that.openConsole();
      }
    });
  },
  initRunCode: function(runCodeObj) {
      var headFragment = new MyFragment('head');
      var bodyFragment = new MyFragment('body');

      runCodeObj.forEach(function (item) {
        var type = item.type;
        var code = item.code;
        var domItem = genCodeStrategy[type](code);
        if (type === 'js') {
          bodyFragment.append(domItem);
        } else if (type === 'html') {
          bodyFragment.prepend(domItem);
        } else {
          headFragment.append(domItem);
        }
      });

      return {
        headFragment: headFragment,
        bodyFragment: bodyFragment,
      };
  },
  initConsole: function () {
    return new window.VConsole({
      defaultPlugins: ['network', 'storage']
    });
  },
  openConsole: function() {
    var that = this;
    that.layerId = window.layer.open({
      title: 'vConsole',
      type: 1,
      area: ['400px', '560px'],
      shadeClose: true,
      resize: true,
      offset: 'rt',
      anim: -1,
      isOutAnim: false,
      shade: 0,
      content: $(that.vConsole.$dom).find('.vc-panel'),
      end: function () {
        that.layerId = null;
      }
    });
  }
};

// 需要的地方执行
// customObj.init(window.runCodeObj);
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