JSON and HTML tags convert to each other

1. JSON strings in Java contain HTML tags

/**
* JSON contains HTML tags for text
* @param str
* @return
*/
public static string Switchstr (String str) {
str = str.replace ("<", "&lt;");
str = str.replace (">", "&gt;");
str = str.replace ("", "&nbsp;");
str = str.replace ("&", "&amp;");
str = str.replace ("\ n", "<br>");
return str;
}

For example, the JSON string contains HTML tags

String json= "<a href= ' http://www.baidu.com ' > Baidu </a>";
System.out.println (test.switchstr (URL));

Output result: &amp;lt;a&amp;nbsp;href= ' http://www.baidu.com ' &amp;gt; Baidu &amp;lt;/a&amp;gt;

2. The HTML tags in the string in JS are converted to each other

(1) Convert HTML tags to json
function HTMLEncode (str) {
str = str.replace (/&/g, ' &amp; ');
str = str.replace (/</g, ' &lt; ');
str = str.replace (/>/g, ' &gt; ');
str = str.replace (//g, ' &nbsp; ‘);
str = str.replace (/t/g, ' &nbsp;&nbsp; ');
str = str.replace (/x22/g, ' &quot; ');
str = str.replace (/(?: t| |v|r) *n/g, ' <br/> ');
str = str.replace (/x27/g, ' & #39; ');
return str;
}

Example: Parsing a tag in JS into a string
var url = "<a href= ' http://www.baidu.com ' > Baidu </a>";
Alert (HTMLEncode (URL));
Results: &l&<br/>bsp;&<br/>bsp;; A href= ' h&<br/>bsp;&<br/>bsp;&<br/>bsp;&<br/>bsp;p://www.baidu.com ' &AMP;G&AMP;&LT;BR/>bsp;&<br/>bsp;; Baidu &l&<br/>bsp;&<br/>bsp;;/ A&AMP;G&AMP;&LT;BR/>bsp;&<br/>bsp;;

(2) Convert JSON to HTML tags
function HtmlDecode (str) {
str = str.replace (/&amp;/gi, ' & ');
str = str.replace (/&nbsp;/gi, ");
str = str.replace (/&quot;/gi, ' "');
str = str.replace (/& #39;/g, "'");
str = str.replace (/&lt;/gi, ' < ');
str = str.replace (/&gt;/gi, ' > ');
str = str.replace (/<br[^>]*> (?:( RN) |r|n)?/gi, ' n ');
return str;
}

For example: The string in the JSON in JS is converted to HTML tags
var json = "&amp;lt;a&amp;nbsp;href= ' http://www.baidu.com ' &amp;gt; Baidu &amp;lt;/a&amp;gt;";
Alert (HtmlDecode (JSON));
Results: <a href= ' http://www.baidu.com ' > Baidu </a>

JSON and HTML tags convert to each other