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Example code for JavaScript filter keywords

黄舟Original: 2017-03-20 14:22:531385browse

This article mainly introduces the JavaScript method of filtering keywords. Has very good reference value. Let’s take a look at it with the editor below

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Without further ado, please look at the code ：

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <style>
  em { font-size: 16px; color: red; }
 </style>
</head>
<body>
 <p id="cont">习近平哈哈哈周永康嘿嘿嘿中共哟西啪啪啪</p>
 <script>
  //================================= 可用状态代码 =====================================
//  var arr = [&#39;习近平&#39;,&#39;周永康&#39;,&#39;中共&#39;, &#39;嘿嘿&#39;],
//   arrText = arr.join(&#39;|&#39;),
//   var params = document.querySelector(&#39;#cont&#39;);
//
//  // 替换关键字
//  params.innerHTML = params.innerHTML.replace(new RegExp(arrText, "ig"), "<em>$&</em>");
//  var arr = [];
//  console.log(arr);

//================================= 修改后的代码 =====================================
  /**
   * 过滤关键字
   * @param keyArr 需要过滤的关键字数组
   * @param ele 过滤的节点
   */
  function filterContent(keyArr, ele) {
   /**
    * 一个程序的标准准则
    * 1. 可用, 可以实现核心的需求
    * 2. 健壮, 兼容性处理, 边界处理, 异常处理, 用户输入校验
    * 3. 可靠, 任何时候都要有返回值
    * 4. 宽容, 对需求宽容, 对调用着宽容, 对维护者宽容
    * 5. 精益求精, 可靠的注释...
    */
   try {
    // 检测是否为 undefined 或者为一个数组，或者数组长度是否大于 1, 这里的返回 -1 只是为了有返回值, 也可以不写
    if (keyArr === &#39;undefined&#39; || !(keyArr instanceof Array) || keyArr.length < 1) return -1;
    // 将数组里面的元素以 | 进行合并方便进行正则比较, 如 张三|李四
    var arrTxt = keyArr.join(&#39;|&#39;),
     regObj = new RegExp(arrTxt, &#39;ig&#39;);
    // 替换关键字
    ele.innerHTML = ele.innerHTML.replace(regObj, "<em>$&</em>");
   } catch (e) {
    console.log(&#39;出错啦~&#39; + e);
   }

  }
  // 调用
  var arr = [&#39;习近平&#39;,&#39;周永康&#39;,&#39;中共&#39;];
  var params = document.querySelector(&#39;#cont&#39;);
  filterContent(arr, params);
 </script>
</body>
</html>

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