jation

// Promise, async, await 快速教程
// 包含异步执行顺序控制、异常控制、多异步排序控制

// t1 多异步串行、异常处理
function t1(){
  function stepA(){ 
    return new Promise((resolve, reject) => {
      setTimeout(()=>{
        Math.random() > 0.5 ? resolve('A') : reject('~A~')
      }, 300)

jation

class Task {
	constructor(task, taskParam, delay) {
		this.task = task; // 传入一个需要被执行的函数
		this.taskParam = taskParam; // task的参数，一个或多个参数装载数组里！数组里！数组里！
		this.delay = delay || 0;
	}
	action() {
		// ...
		typeof this.task === 'function' && this.task.apply(null, this.taskParam);
	}

jation

/*
 location.search == '?a=1&b=&c
 return {a:'1',b:''}
 //注意是字符串……
*/ 
function getUrlParams() {
  var qs = location.search.split("+").join(" ");
  var params = {}, tokens, re = /[?&]?([^=]+)=([^&]*)/g;
  while (tokens = re.exec(qs)) params[decodeURIComponent(tokens[1])] = decodeURIComponent(tokens[2]);
  return params;

jation

/*
  e.g.
  levenshteinDistance("aa","a") = 1;
  levenshteinDistance("ab","ab") = 1;
  levenshteinDistance("a","b") = 1;
*/
var levenshteinDistance = function(s, t) {
    var d = []; //2d matrix

    // Step 1

jation

if(typeof Array.isArray==="undefined"){
	Array.isArray = function(args){
		return Object.prototype.toString.call(args) === "[object Array]";
	};
}//else{
	//p("call default isArray()" + Array.isArray(a))
//}