goja-core/src/main/java/goja/core/kits/lang/Strs.java
public static String escapeHtml(CharSequence cs) {
        if (null == cs)
            return null;
        char[] cas = cs.toString().toCharArray();
        StringBuilder sb = new StringBuilder();
        for (char c : cas) {
            switch (c) {
                case '&':
                    sb.append("&amp;");
                    break;
                case '<':
                    sb.append("&lt;");
                    break;
                case '>':
                    sb.append("&gt;");
                    break;
                case '\'':
                    sb.append("&#x27;");
                    break;
                case '"':
                    sb.append("&quot;");
                    break;
                default:
                    sb.append(c);
            }
        }
        return sb.toString();
    }
public static String escapeHtml(CharSequence cs) {
        if (null == cs)
            return null;
        char[] cas = cs.toString().toCharArray();
        StringBuilder sb = new StringBuilder();
        for (char c : cas) {
            switch (c) {
                case '&':
                    sb.append("&amp;");
                    break;
                case '<':
                    sb.append("&lt;");
                    break;
                case '>':
                    sb.append("&gt;");
                    break;
                case '\'':
                    sb.append("&#x27;");
                    break;
                case '"':
                    sb.append("&quot;");
                    break;
                default:
                    sb.append(c);
            }
        }
        return sb.toString();
    }
将一个字符串出现的HMTL元素进行转义，比如
<p/>
<pre>
escapeHtml("&lt;script&gt;alert("hello world");&lt;/script&gt;") => "&amp;lt;script&amp;gt;alert(&amp;quot;hello world&amp;quot;);&amp;lt;/script&amp;gt;"
</pre>
<p/>
转义字符对应如下
<ul>
<li>& => &amp;amp;
<li>< => &amp;lt;
<li>>=> &amp;gt;
<li>' => &amp;#x27;
<li>" => &amp;quot;
</ul>

@param cs 字符串
@return 转换后字符串