javascript - 如何在查找与搜索框匹配的文本时打开描述 p 标签，否则应禁用 p 标签

Question

我必须创建一个搜索内容，其中包含搜索框、标题和段落描述。默认情况下，描述被禁用，当我输入一些与描述文本匹配的文本时，描述段落标签应该打开。一些匹配的演示是这样的:

[ fiddle ][1]

但默认情况下，p 标签应被禁用，并且仅当搜索文本匹配时才可见。

function highlightSearch() {
    var text = document.getElementById("query").value;
    var query = new RegExp("(\\b" + text + "\\b)", "gim");
    var e = document.getElementById("searchtext").innerHTML;
    var enew = e.replace(/(<span>|<\/span>)/igm, "");
    document.getElementById("searchtext").innerHTML = enew;
    var newe = enew.replace(query, "<span>$1</span>");
    document.getElementById("searchtext").innerHTML = newe;
	
}

#searchtext span{
    background-color:#FF9;
    color:#555;
}

div {
    padding: 10px; 
}

<div><h2>Find and highlight text in document</h2>
<form action="" method="" id="search" name="search">
<input name="query" id="query" type="text" size="30" maxlength="30">
<input name="searchit" type="button" value="Search" onClick="highlightSearch()">
</form></div>
<div id="searchtext">
<p>JavaScript is the programming language of the Web. The overwhelming majority of
modern websites use JavaScript, and all modern web browsers—on desktops, game
consoles, tablets, and smart phones—include JavaScript interpreters, making Java-
Script the most ubiquitous programming language in history. JavaScript is part of the
triad of technologies that all Web developers must learn: HTML to specify the content
of web pages, CSS to specify the presentation of web pages, and JavaScript to specify
the behavior of web pages. This book will help you master the language.</p>
  
<p>If you are already familiar with other programming languages, it may help you to know
that JavaScript is a high-level, dynamic, untyped interpreted programming language
that is well-suited to object-oriented and functional programming styles. JavaScript
derives its syntax from Java, its first-class functions from Scheme, and its prototypebased
inheritance from Self. But you do not need to know any of those languages, or
be familiar with those terms, to use this book and learn JavaScript.</p>
  
<p>The name "JavaScript" is actually somewhat misleading. 
  <span>Except</span> 
  for a superficial syntactic
resemblance, JavaScript is completely different from the Java programming language.
And JavaScript has long since outgrown its scripting-language roots to become
a robust and efficient general-purpose language. The latest version of the language (see
the sidebar) defines new features for serious large-scale software development.</p>
  
</div>

Answer 1

请尝试下面的 JS -

  
function highlightSearch() {
        var text = document.getElementById("query").value;
 
         if ($("#searchtext").has(":contains("+text+")").length) { 
           $('#searchtext').show();
          }
        else 
           {
             $('#searchtext').hide();
            }
      var query = new RegExp("(\\b" + text + "\\b)", "gim");
        var e = document.getElementById("searchtext").innerHTML;
        var enew = e.replace(/(<span>|<\/span>)/igm, "");
        document.getElementById("searchtext").innerHTML = enew;
        var newe = enew.replace(query, "<span>$1</span>");
        document.getElementById("searchtext").innerHTML = newe;
    	
    }

#searchtext span{
        background-color:#FF9;
        color:#555;
    }

    div {
        padding: 10px; 
    }
#searchtext {
display:none;  
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>