var array1 = [1,2]  //方法一

var array2 = new Array() //方法二
array[0] = 1;
array[1] = 2;

var array1 = [1,2];
var l = array1.length;
//for循环
for(var i=0;i< l;i++){
  console.log(array1 [i]);
}

//for...in 循环
for (x in array1 ){
  console.log(array1 [x]);
}

var arr = [1];
var arr1 = ["herry"]
var arr3 = arr.concat(arr1); //[1,"herry"]

var arr = [1];
var arr1 = "herry";
var arr2 = ["herry"];

//注意向数组中追加的是元素
var l = arr.push(arr1);
console.log(l); //2
console.log(arr) //[1,"herry"]


//数组会以数组形式追加到尾部
var l = arr.push(arr2);
console.log(l); //3
console.log(arr) //[1,"herry",Array(1)["herry"]]

var arr = [1,"herry"];
var del = arr.pop() ;
console.log(del); //"herry"
console.log(arr.length); //1

function sortNumber(a,b)
{
return a - b
}

var arr = new Array(6)
arr[0] = "10"
arr[1] = "5"
arr[2] = "40"
arr[3] = "25"
arr[4] = "1000"
arr[5] = "1"

document.write(arr + "<br />") //10,5,40,25,1000,1
document.write(arr.sort(sortNumber)) //1,5,10,25,40,1000

var arr = [1,2,3,4,5,6];
arr.slice(2); //[3,4,5,6]
console.log(arr); //[1,2,3,4,5,6]

var arr = [1,2,3,4,5,6];
console.log(arr); //[1,2,3,4,5,6]
arr.splice(2,3,"William")
console.log(arr); // [1,2,"William",6]

var arr = [1,2,3];
arr.reverse(); //[3,2,1]

var arr = [1,2,3];
arr.join("-");  //"1-2-3"