binux/background.html

## background.html
<html>
	<head>
	</head>
	<body>
		<script>
			function fetchLocation(callback,ip) {
				var req = new XMLHttpRequest();
				req.open("GET","http://www.youdao.com/smartresult-xml/search.s?type=ip&q="+ip,true);
				req.onload = function() {
					var response = req.responseText;
					var ip = response.match(/<ip>(.*)<\/ip>/)[1];
					var loc = response.match(/<location>(.*)<\/location>/)[1];
					callback({'ip': ip,'loc': loc});
				}
				req.send(null);
			}

			function onRequest(request, sender, callback) {
				if(request.action == 'fetchLocation') {
					fetchLocation(callback, request.ip);
				}
			}

			chrome.extension.onRequest.addListener(onRequest);
		</script>
	</body>
</html>

## ip2loc.js
function onLoad() {
	var fonts = document.getElementsByTagName("font");
	for ( var i = 0,font;font = fonts[i];i++ )
	{
		var result = font.innerText.match(/\[FROM:\D{0,5}(\d+\.\d+\.\d+\.[0-9*]+)\]/);
		if(result && font.lastChild.nodeName != "SPAN")
		{
			var ip = result[1].replace("*","0");

			var span = document.createElement("span");
			span.innerHTML = " [ LOADING... ]";
			span.className = ip;
			font.appendChild(span);

			sendRequest(ip)
		}
	}
}

function sendRequest(ip){
		chrome.extension.sendRequest({'action': 'fetchLocation','ip': ip},showAddress);
}

function showAddress(response){
	var spans = document.getElementsByClassName(response.ip);
	for(var i=0,span;span = spans[i];i++){
		span.innerText = " [" + response.loc + "] ";
	}
}

var IP2LOC_DOCUMENT_HIGHT = 0;
function checkDom() {
    if (IP2LOC_DOCUMENT_HIGHT != document.height ) {
        IP2LOC_DOCUMENT_HIGHT = document.height;
        onLoad();
    }
    setTimeout("checkDom()", 500);
}

checkDom();

## manifest.json
{
	"name": "BYR-BBS-IP2LOCATION",
	"version": "1.3",
	"description": "The first extension that I made.  By Binux[瓒冲厗鍙夎櫕]",

	"background_page": "background.html",
	"content_scripts": [
	{
		"matches": [
			"http://forum.byr.edu.cn/*",
			"http://forum.byr.cn/*",
			"http://bbs.byr.edu.cn/*",
			"http://bbs6.byr.edu.cn/*",
			"http://bbs.byr.cn/*",
			"http://bbs6.byr.cn/*"
		],
		"js": ["ip2loc.js"],
		"all_frames": true
   }
  ],
  "permissions": [
    "http://www.youdao.com/"
  ]
}
	<html>
	<head>
	</head>
	<body>
	<script>
	function fetchLocation(callback,ip) {
	var req = new XMLHttpRequest();
	req.open("GET","http://www.youdao.com/smartresult-xml/search.s?type=ip&q="+ip,true);
	req.onload = function() {
	var response = req.responseText;
	var ip = response.match(/<ip>(.*)<\/ip>/)[1];
	var loc = response.match(/<location>(.*)<\/location>/)[1];
	callback({'ip': ip,'loc': loc});
	}
	req.send(null);
	}

	function onRequest(request, sender, callback) {
	if(request.action == 'fetchLocation') {
	fetchLocation(callback, request.ip);
	}
	}

	chrome.extension.onRequest.addListener(onRequest);
	</script>
	</body>
	</html>
	function onLoad() {
	var fonts = document.getElementsByTagName("font");
	for ( var i = 0,font;font = fonts[i];i++ )
	{
	var result = font.innerText.match(/\[FROM:\D{0,5}(\d+\.\d+\.\d+\.[0-9*]+)\]/);
	if(result && font.lastChild.nodeName != "SPAN")
	{
	var ip = result[1].replace("*","0");

	var span = document.createElement("span");
	span.innerHTML = " [ LOADING... ]";
	span.className = ip;
	font.appendChild(span);

	sendRequest(ip)
	}
	}
	}

	function sendRequest(ip){
	chrome.extension.sendRequest({'action': 'fetchLocation','ip': ip},showAddress);
	}

	function showAddress(response){
	var spans = document.getElementsByClassName(response.ip);
	for(var i=0,span;span = spans[i];i++){
	span.innerText = " [" + response.loc + "] ";
	}
	}

	var IP2LOC_DOCUMENT_HIGHT = 0;
	function checkDom() {
	if (IP2LOC_DOCUMENT_HIGHT != document.height ) {
	IP2LOC_DOCUMENT_HIGHT = document.height;
	onLoad();
	}
	setTimeout("checkDom()", 500);
	}

	checkDom();
	{
	"name": "BYR-BBS-IP2LOCATION",
	"version": "1.3",
	"description": "The first extension that I made. By Binux[瓒冲厗鍙夎櫕]",

	"background_page": "background.html",
	"content_scripts": [
	{
	"matches": [
	"http://forum.byr.edu.cn/*",
	"http://forum.byr.cn/*",
	"http://bbs.byr.edu.cn/*",
	"http://bbs6.byr.edu.cn/*",
	"http://bbs.byr.cn/*",
	"http://bbs6.byr.cn/*"
	],
	"js": ["ip2loc.js"],
	"all_frames": true
	}
	],
	"permissions": [
	"http://www.youdao.com/"
	]
	}