var arr=[1,2,3,4,5];console.dir(arr);var pro=Object.getPrototypeOf(arr);console.dir(pro);

来一个个的查看数组的属性，方法

1.Array的静态方法

var arr=[1,2,3,4,5];console.log(Array.isArray(arr))  //true

2.arr的属性

var arr=[1,2,3,4,5];var con=arr.constructor;console.dir(con);var length=arr.length;console.dir(length);

3.arr的方法

  1.concat

var arr=[1,2,3,4,5];var a2=arr.concat("hongda");console.log(a2);var a3=arr.concat(["hong","da","da"]);console.log(a3);var a4=arr.concat("hongda1","hongda2",["hongda3","hongda4"]);console.log(a4);

2.every,some,map,forEach

var arr=["hong","da","da2","da3"];//everyvar result=arr.every(function(value,index,array){  console.log("value:"+value+"       index:"+index+"          array:"+array);  return true;});console.log(result);//somevar result=arr.some(function(value,index,array){  console.log("value:"+value+"       index:"+index+"          array:"+array);  return true;});console.log(result);//mapvar result=arr.map(function(value,index,array){  console.log("value:"+value+"       index:"+index+"          array:"+array);  return value+index;});console.log(result);//forEachvar result=arr.every(function(value,index,array){  console.log("value:"+value+"       index:"+index+"          array:"+array);});console.log(result);

1，filter，按指定函数过滤元素，汇集返回值为true元素组成新的数组，函数值类型为布尔

2，forEach，在每一个元素上执行函数，函数返回类型为空

3，every，贪婪的试图匹配每一个元素，真到有一个返回false为止，函数值类型为布尔

4，some，懒惰的企图找到一个元素合乎要求，只要有一个返回true停止，函数值类型为布尔

5，map，使用同一函数处理每一个元素并返回，汇集返回结果组成新数组，函数返回类型为元素类型

3.filter

var arr = [5, "element", 10, "the", true];var result = arr.filter(    function (value) {        return (typeof value === 'string');    });console.log(result);  //element,the

5.lastIndexOf

var ar = ["ab", "cd", "ef", "ab", "cd"];console.log(ar.lastIndexOf("cd"));  //4

6.reduce

var arr=["hong","da","da2","da3"];var result=arr.reduce(function(previousValue,currentValue,currentIndex,array){ console.log("previousValue:"+previousValue+"          currentValue:"+currentValue+"       currentIndex:"+currentIndex+"          array:"+array);});

var arr=["hong","da","da2","da3"];var result=arr.reduce(function(previousValue,currentValue,currentIndex,array){ console.log("previousValue:"+previousValue+"          currentValue:"+currentValue+"       currentIndex:"+currentIndex+"          array:"+array); return currentValue+currentIndex;});console.log(result);

var arr=["hong","da","da2","da3"];var result=arr.reduce(function(previousValue,currentValue,currentIndex,array){ console.log("previousValue:"+previousValue+"          currentValue:"+currentValue+"       currentIndex:"+currentIndex+"          array:"+array); return previousValue+currentValue;});console.log(result);

 7.reduceRight

var arr=["hong","da","da2","da3"];var result=arr.reduceRight(function(previousValue,currentValue,currentIndex,array){ console.log("previousValue:"+previousValue+"          currentValue:"+currentValue+"       currentIndex:"+currentIndex+"          array:"+array); return previousValue+currentValue;});

8.reverse

var arr=["hong","da","da2","da3"];var result=arr.reverse();console.log(result);console.log(arr);

9.sort

var a = new Array(4, 11, 2, 10, 3, 1);var b = a.sort();document.write(b);document.write("
");// This is ASCII character order.// Output: 1,10,11,2,3,4)// Sort the array elements with a function that compares array elements.b = a.sort(CompareForSort);document.write(b);document.write("
");// Output: 1,2,3,4,10,11.// Sorts array elements in ascending order numerically.function CompareForSort(first, second){    if (first == second)        return 0;    if (first < second)        return -1;    else        return 1; }