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function leftTrimTstr(str) {
    let strArr = str.split('\n'),
        noStartSpace = strArr.filter(str => /^[^-\s].*/.test(str) && str !== '').length > 0;
    if (strArr.length === 1 || noStartSpace) {
        // 单行字符串，或存在顶格行的多行字符串不作处理
        return str;
    }
    else {
        let spaceArr = strArr.map(str => str.match(/^\s+/)).filter(v => v).map(arr => arr[0]);
        let shortestSpaceLen = Math.min.apply(null, spaceArr.map(space => space.length));

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function getAllCountriesCode() {
    var table = document.getElementsByClassName("v-table-table")[0]
      , trArr = table.firstChild.children
      , codeArr = Array.from(trArr).map(tr=>tr.children[3].firstChild.innerText);
    return codeArr;
}

function code2url(code) {
    return `http://biogeo.ucdavis.edu/data/gadm2.8/shp/${code}_adm_shp.zip`
}

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// parseInt(string, radix);
parseInt('000050',16)

// numObj.toString([radix])
parseInt(44112).toString(16)

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/** 定时任务，每隔一定时间，从任务队列取任务，送给执行函数处理。
 * @param {Array} taskQueue 任务队列
 * @param {Function} execFn 任务处理函数
 * @param {Number} subQueuLen 每次处理的任务数
 * @param {Number} duration 每次处理任务的时间
 */
function taskTimer(taskQueue, execFn, subQueueLen, duration) {
    let numOfSubQueue = Math.ceil(taskQueue.length / subQueueLen), i = 0, timmer, paused = false;
    if(!isArgsValid()){return false}
    function isArgsValid() {

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let app = require('express')(),
    session = require('express-session'),
    cookieParser = require('cookie-parser'),
    http = require('http'),
    io = require('socket.io'),
    store = new session.MemoryStore();

// 添加 session 支持
app.use(session({
    secret: 'test',

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// 生成 zjhou's logo
(function(opt) {
    let OPTION = Object.assign({
        canvasWd: 512,
        canvasHt: 512,
        logoXpos: '',
        logoYpos: '',
        logoSize: 4,
        color: '#000',
        $wrapper: document.querySelector('body')

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class EventObserver {
    constructor() {
        this.observers = [];
    }
    subscribe(fn) {
        this.observers.push(fn);
    }
    unsubscribe(fn) {
        this.observers = this.observers.filter(subscribe => subscribe !== fn);
    }

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// 1. 拿页面
var Get = function(url) {
  const promise = new Promise(function(resolve, reject){
    const handler = function() {
      if (this.readyState !== 4) {
        return;
      }
      if (this.status === 200) {
        resolve(this.response);
      } else {