这个主题的代码高亮功能集成的是 Google Code Prettify ，开始只是想着调整下高亮代码的显示色彩，于是体验了几个 Google Code Prettify 的 css 样式。接下来又想起了增加行号、增加复制代码和增加展开收缩代码功能，在一番折腾下还是实现了。现将实现方法记录如下：

1.确保 functions.php 文件中引用了 Prettify.js 文件，我是删除了原主题对 Prettify.js 的引用，而是在 static 文件夹下新建了一个 code-features.js 文件，将 Prettify.js 代码和为实现展开收缩以及复制代码功能而增加的自定义代码放在了一起。

在 functions.php 文件中引用 code-features.js 文件。

展开复制
if ( get_theme_mod( 'biji_setting_prettify', true ) ) {
	wp_enqueue_script( 'code-features', get_template_directory_uri() . '/static/code-features.js', [], THEME_VERSION, true );
}

code-features.js 文件代码记录如下：

展开复制
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                navigator.clipboard.writeText(codeText).then(function() {
                    button.textContent = "已复制";
                    setTimeout(function() {
                        button.textContent = "复制";
                    }, 2000);
                }).catch(function(err) {
                    console.error("复制失败", err);
                });
            });
        });
    }
}
document.addEventListener("DOMContentLoaded", function() {
    bindCodeFeatures();
});

2.修改主题 functions.php 文件中的代码高亮代码为：

展开复制
// 代码高亮
function dangopress_esc_html( $content ) {
    if ( ! get_theme_mod( 'biji_setting_prettify', true ) ) {
        return $content;
    }
    if ( ! is_feed() || ! is_robots() ) {
        $content = preg_replace( '/<code(.*?)>/i', "<code class=\"prettyprint\" \$1>", $content );
    }
    $regex = '/(<code.*?>)(.*?)(<\/code>)/sim';
    return preg_replace_callback( $regex, function ( $matches ) {
        $tag_open  = $matches[1];
        $content   = $matches[2];
        $tag_close = $matches[3];
        $content   = esc_html( $content );
        return '<div class="code-container">' .
               '<div class="code-toolbar">' .
               '<button class="toggle-code">展开</button>' .
               '<button class="copy-code">复制</button>' .
               '</div>' .
               '<div class="code-content">' .
               $tag_open . $content . $tag_close .
               '</div>' .
               '</div>';
    }, $content );
}
add_filter( 'the_content', 'dangopress_esc_html', 2 );
add_filter( 'comment_text', 'dangopress_esc_html', 2 );

3.添加并调整 CSS 样式，需要结合自身主题进行必要的修改。如下样式为集成了精简后的 Prettify.css 和为了适配主题暗黑模式以及实现展开收缩功能而增加的一些必要 css 代码，仅供参考。

展开复制
body pre{border:none!important;padding:0!important;box-shadow:0 0 0 1px rgba(188,195,206,.2) inset;font-size:85%; background: rgba(188, 195, 206, 0.1)}
body pre code{padding-right:0.8rem}
.pln { color: #000 }.dark .pln { color: #fff }
.str { color: #080 }.dark .str { color: #ffa0a0 }
.kwd { color: #008 }.dark .kwd { color: #8BC34A }
.com { color: #800 }.dark .com { color: #87ceeb }
.typ { color: #606 }.dark .typ { color: #98fb98 }
.lit { color: #066 }.dark .lit { color: #cd5c5c }
.pun, .opn, .clo { color: #660 }.dark .pun { color: #fff }
.tag { color: #008 }.dark .tag { color: #f0e68c }
.atn { color: #606 }.dark .atn { color: #bdb76b }
.atv { color: #080 }.dark .atv { color: #ffa0a0 }
.dec, .var { color: #606 } .dark .dec { color: #98fb98 }
.fun { color: red }
.code-toolbar{display:flex;justify-content:space-between;background:#eef0f3}
.dark .code-toolbar{background:#3b4351}
.code-toolbar button{color:#3b4351;border:none;padding:0.2rem 0.5rem;cursor:pointer}
.dark .code-toolbar button{background:#303742;color:#abb8c3}
.code-content {max-height:0;overflow:auto}
.code-content.expanded{max-height:none}

4.适配该主题开启 PJAX。修改主题的 script.js 文件中的 after() 方法：通过调用 bindCodeFeatures() 来重新绑定展开/收缩和复制功能。

展开复制
after() {
	$vm.sleep(100).then(() => {
		$vm.animation = 'animation-end';
		$vm.overload();
		if (document.getElementById('map')) {
			initializeMap();
		}
		// 重新绑定
		bindCodeFeatures();
	});
//其它代码
}