投标警示器,监控界面是否出现用户设定关键字

ProgramAlert.user.js

// ==UserScript==
// @name        ProgrameAlert
// @namespace   net.jacky.p2p
// @description 扫标器
// @include     https://www.zyxr.com/invest/share_program.html*
// @version     1
// @grant       GM_getValue
// @grant       GM_setValue
// @grant       GM_registerMenuCommand
// @grant       GM_xmlhttpRequest
// ==/UserScript==

var $ = function(id){
  return document.getElementById(id);
}
var intervalObj = null;
function init(){
  console.log('-----start');
  console.log('p2p_'+getHost() +"->" +GM_getValue('p2p_'+getHost() ));
  addCmd('添加标的关键字',registerItem);
  var item = GM_getValue('p2p_'+getHost() );
  searchItem(item);
  console.log('-----end')
}

function addCmd(title,func){
  GM_registerMenuCommand(title,func); 
}

function registerItem(){
  var host = getHost();
  var item = window.prompt('添加关键字',GM_getValue('p2p_' +host));
  if(item != null){
  GM_setValue('p2p_'+host,item);
  window.location.reload();
    
  }
}
function getHost(){
  var h = document.location.href;
  h = h.substring( h.indexOf("://")+3);
  var host = h.substring(0,h.indexOf("/"));
  return host;
}

function searchItem(key){
  var t = searchAndAlert(key);
  intervalObj = window.setInterval(t,30 * 1000);
}

function searchAndAlert(key){
  return function(){
    console.log('searching...');
    getWebContent();
    
  }
}
function getWebContent(){
  var url = window.location.href;
  GM_xmlhttpRequest({
  method: "GET",
  url: url,
  onload: function(response) {
    var content = (response.responseText);
    console.log(content);
    var key = GM_getValue('p2p_' +getHost());
    if(content.indexOf(key) > 0){
      alert('出现' + key + '了!');
      window.clearInterval(intervalObj);
    }
  }
});
  return 'GM_xmlhttpRequest';
}
window.addEventListener('load', init,true);