限制你上某些网站的Chrome插件——Website Postponer

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function checkExisted(newUrl){ //检查加入的网址是不是已经在列表中了
	var num = localStorage["count"];
	for(var i=0; i<num; ++i){
		var urli = "url" + i;
		var url = localStorage[urli];
		if(newUrl==url) return true;
	}
	return false;
}
// Saves options to localStorage.
function save_options() {//用户填完信息后，保存选项，保存到localStorage
  var select = document.getElementById("time");  //get the time
  var time = select.children[select.selectedIndex].value;
  var timeshow = select.children[select.selectedIndex].text;
  localStorage["time"] = time;
  localStorage["timeshow"] = timeshow;
  //alert(time);

  var url = document.getElementById("url").value;  //get the url
  if(url){	//url: not null
	var existed = checkExisted(url);
	if(!existed){	// add url when it is not existed in the localStorage
		var num = localStorage["count"];
		var urli = "url" + num;
		localStorage[urli] = url;
		localStorage["count"] = parseInt(num) + 1;
	}

  }

  //alert(url);

  restore_options();
}
// Restores value from localStorage.
function restore_options() {//当打开选项页时，恢复保存的信息
  var timeshow = localStorage["timeshow"];
  document.getElementById("selectedtime").innerHTML = ""; //clear the old time first
  if (timeshow) {
	document.getElementById("selectedtime").innerHTML = timeshow;
  }
  var num = localStorage["count"];
  document.getElementById("weblist").innerHTML = ""; //clear the old weblist first
  for(var i=0; i<num; ++i){
	var urli = "url" + i;
	var url = localStorage[urli];
	if(url) {
		document.getElementById("weblist").innerHTML = document.getElementById("weblist").innerHTML + "</br>" + url;
	}
  }


}

function clear_options() {//清除选项
  var num = localStorage["count"];
  for(var i=0; i<num; ++i){
	var urli = "url" + i;
	localStorage[urli] = "";
	//if(!localStorage[urli]) alert("done");
  }
  localStorage["count"] = 0;
  localStorage["time"] = "";
  localStorage["timeshow"] = "";
  restore_options();
}
//添加事件监听器
document.addEventListener('DOMContentLoaded', function () {
  document.querySelector('#btnSave').addEventListener('click', save_options);  //通过id找到相应元素
  document.querySelector('#btnClear').addEventListener('click', clear_options);
  window.addEventListener('load', restore_options);
});

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//localStorage只初始化一次
if(!localStorage["count"])	//init only once
	localStorage["count"] = 0;  //the total number of urls

// Called when the url of a tab changes.
function showPageAction(url, tabId) {//设置在哪些页面显示图标
  // If the url is:chrome://chrome/extensions
  if (url.indexOf('chrome://chrome/extensions') > -1) {
	// ... show the page action.
	chrome.pageAction.show(tabId);
  }
};
//如果网站在列表中，且时间未到，重定向。目前我是将它重定向到google.ca
function blockWebsite(newUrl, tabId, tab) {
	if(!newUrl) return;
	var num = localStorage["count"];
	var time = localStorage["time"];
	var today=new Date();
	var now=today.getHours();
	for(var i=0; i<num; ++i){
		var urli = "url" + i;
		var url = localStorage[urli];
		if(newUrl.indexOf(url)>-1 && now<time) { //if the website is in the list and the time is less what you set,redirect.
			chrome.tabs.update(tabId, { url: "http://www.google.ca" });	
			break;
		}
	}
}
// Listen for any changes to the URL of any tab.
chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab){
	var myurl = tab.url;
	showPageAction(myurl, tabId); //show pageAction or not
	blockWebsite(myurl, tabId); //if the website is in the list, block it;
});

//open the options page
function openOptions(){
	var url = "options.html";
	var fullUrl = chrome.extension.getURL(url);//chrome-extension://your extension id//options.html	
	chrome.tabs.getAllInWindow(null, function(tabs){
		for(var i in tabs){
			var tab = tabs[i];
			if(tab.url == fullUrl){//如果选项页已经打开了，就定位到那
				chrome.tabs.update(tab.id, {selected: true});
				return;
			}
		}
		//如果选项页没有打开，则打开它
		chrome.tabs.getSelected(null, function(tab){
			chrome.tabs.create({ url: url, index: tab.index+1});
		});
	});
}
//点击图标时，调用openOptions函数
chrome.pageAction.onClicked.addListener(openOptions);