<script type="text/javascript">

    //shift:删除原数组的第一项，返回删除元素的值；如果数组为空则返回undefined

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

    var out = arr.shift();

    console.log(arr); //[2,3,4,5]

    console.log(out); //

    var arr = [];

    var out = arr.shift();

    console.log(arr); //[]

    console.log(out); //undefined

    //unshift:将参数添加到原数组开头，返回数组的长度(ie6下返回undefined)

    var arr = [1, 2];

    var out = arr.unshift(-1, 0);

    console.log(arr); //[-1,0,1,2]

    console.log(out); //

    //pop:删除原数组的最后一项，返回数组删除的值；如果数组为空则返回undefined

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

    var out = arr.pop();

    console.log(arr); //[1,2,3,4]

    console.log(out); //

    var arr = [];

    var out = arr.pop();

    console.log(arr); //[]

    console.log(out); //undefined

    //push:将参数添加到原数组的末尾，返回数组的长度

    var arr = [1, 2, 3];

    var out = arr.push(4, 5, 6);

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

    console.log(out); //

    //concat:返回一个将参数添加到原数组中构成的新数组

    var arr = [1, 2, 3];

    var out = arr.concat(4, 5);

    console.log(arr); //[1,2,3]

    console.log(out); //[1,2,3,4,5]

    //splice(start,deleteCount,val1,val2,...):从start位置开始删除原数组deleteCount项，并从该位置起插入val1,val2,...，返回删除的项组成的新数组

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

    var out = arr.splice(2, 2, 7, 8, 9, 10);

    console.log(arr); //[1,2,7,8,9,10,5]

    console.log(out); //[3,4]

    //在清空数组时仅需传递start，如果不删除所有元素，再传递deleteCount

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

    var out = arr.splice(2);

    console.log(arr); //[1,2]

    console.log(out); //[3,4,5]

    //同shift

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

    var out = arr.splice(0, 1);

    console.log(arr); //[2,3,4,5]

    console.log(out); //[1]

    //同unshift

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

    var out = arr.splice(0, 0, 22, -1, 0);

    console.log(arr); //[22,-1,0,1,2,3,4,5]

    console.log(out); //[]

    //同pop

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

    var out = arr.splice(arr.length - 1, 1);

    console.log(arr); //[1,2,3,4]

    console.log(out); //[5]

    //同push

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

    var out = arr.splice(arr.length, 0, 6, 7, 8);

    console.log(arr); //[1,2,3,4,5,6,7,8]

    console.log(out); //[]

    //reverse:将原数组倒序；

    var arr = ['a', 1, {}, [2, 3]];

    console.log(arr); //['a', 1, {}, [2, 3]]

    var out = arr.reverse();

    console.log(arr); //[[2,3],{},1,'a']

    console.log(out); //[[2,3],{},1,'a']

    var arr = [0, 1, 5, 10, 15];

    arr.reverse();

    console.log(arr); //[15,10,5,1,0]

    var arr = [1, 0, 5, 15, 10];

    arr.reverse();

    console.log(arr); //[10,15,5,0,1]

    //sort(orderfunction):sort()为升序排列，但是先调用每个数组项的toString()方法，然后比较字符串来排序，是按ASCII进行比较的；

    //所以跟reverse不同原理不同。sort()不带参数的时候是从字面上对数组排序

    var arr = [0, 1, 5, 10, 15];

    arr.sort();

    console.log(arr); //0,1,10,15,5 ,注意这里是字符串按ASCII进行比较的

    //调用这样的函数就按数值方式排列了

    function sortNumber(a, b) {

        return a - b

    }

    arr.sort(sortNumber);

    console.log(arr);   //0,1,5,10,15

    //slice(start,end):返回从原数组中指定start到end(不包含该元素)之间的项组成的新数组,如只有一个参数，则从start到数组末尾

    var arr = [1, 2, 3, 4, 5, 6, 7, 8];

    var out = arr.slice(2,3);

    console.log(arr); //[1, 2, 3, 4, 5, 6, 7, 8]

    console.log(out); //[3]

    //join(separator):将数组的元素组成一个字符串，以separator为分隔符，省略的话则用默认用逗号为分隔符

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

    var out = arr.join();

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

    console.log(out); //1,2,3,4,5,6

    out = arr.join("");

    console.log(out); //

    out = arr.join("&");

    console.log(out); //1&2&3&4&5&6

</script>