ES6常用数组方法

	var arr = [1,2,3,4,3,4]; 
	var arr2 = [...new Set(arr)];

	let [x,y] = [1,2];
	[y,x] = [x,y];
	console.log(y);

	let arr= "hellomybo";
	console.log(arr[3]);

	 let a1 = [1,2,3].map(function (x) {
	            return x * x;
	 });

	  let a2 = [1,2,3].map(x => x * x);
	
	  console.log(a1,a2);

	var arr1 = ['a', 'b'];
	var arr2 = ['c'];
	var arr3 = ['d', 'e'];

	arr1.concat(arr2, arr3);
	// [ 'a', 'b', 'c', 'd', 'e' ]

	[...arr1, ...arr2, ...arr3]
	// [ 'a', 'b', 'c', 'd', 'e' ]

	let str = "12345678900987654321";

	str.split('').reverse().join('')

	[...str].reverse().join('')

	['a',,'b'].filter(x => true)     // ['a','b']    

	let arr = [1,2,3,4].map(x=>x+1);
	console.log(arr);

var arr = [1, [[2, 3], 4], [5, 6]];

var flat = function* (a) {
  var length = a.length;
  for (var i = 0; i < length; i++) {
    var item = a[i];
    if (typeof item !== 'number') {
      yield* flat(item);
    } else {
      yield item;
    }
  }
};

for (var f of flat(arr)) {
  console.log(f);
}

var arr = new Array(6)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
arr[3] = "James"
arr[4] = "Adrew"
arr[5] = "Martin"

document.write(arr + "<br />")
arr.splice(2,1,"William")
document.write(arr)
输出：
//George,John,Thomas,James,Adrew,Martin
//George,John,William,James,Adrew,Martin