<scripttype="text/javascript">
//shift:刪除原數組的第一項，返回刪除元素的值；如果數組爲空則返回undefined
var arr = [1, 2, 3, 4, 5];
var out = arr.shift();
console.log(arr); //[2,3,4,5]
console.log(out); //1
var arr = [];
var out = arr.shift();
console.log(arr); //[]
console.log(out); //undefined
//unshift:將參數添加到原數組開頭，返回數組的長度(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); //4
//pop:刪除原數組的最後一項，返回數組刪除的值；如果數組爲空則返回undefined
var arr = [1, 2, 3, 4, 5];
var out = arr.pop();
console.log(arr); //[1,2,3,4]
console.log(out); //5
var arr = [];
var out = arr.pop();
console.log(arr); //[]
console.log(out); //undefined
//push:將參數添加到原數組的末尾，返回數組的長度
var arr = [1, 2, 3];
var out = arr.push(4, 5, 6);
console.log(arr); //[1,2,3,4,5,6]
console.log(out); //6
//concat:返回一個將參數添加到原數組中構成的新數組
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,...):從start位置開始刪除原數組deleteCount項，並從該位置起插入val1,val2,...，返回刪除的項組成的新數組
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]
//在清空數組時僅需傳遞start，如果不刪除所有元素，再傳遞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:將原數組倒序；
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()爲升序排列，但是先調用每個數組項的toString()方法，然後比較字符串來排序，是按ASCII進行比較的；
//所以跟reverse不同原理不同。sort()不帶參數的時候是從字面上對數組排序
var arr = [0, 1, 5, 10, 15];
arr.sort();
console.log(arr); //0,1,10,15,5 ,注意這裏是字符串按ASCII進行比較的
//調用這樣的函數就按數值方式排列了
function sortNumber(a, b) {
return a - b
}
arr.sort(sortNumber);
console.log(arr); //0,1,5,10,15
//slice(start,end):返回從原數組中指定start到end(不包含該元素)之間的項組成的新數組,如只有一個參數，則從start到數組末尾
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):將數組的元素組成一個字符串，以separator爲分隔符，省略的話則用默認用逗號爲分隔符
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); //123456
out = arr.join("&");
console.log(out); //1&2&3&4&5&6
</script>
/** 刪除數組中指定索引的數據 **/
Array.prototype.deleteAt = function (index) {
if (index< 0) {
return this;
}
return this.slice(0, index).concat(this.slice(index + 1, this.length));
}
/** 數組洗牌 **/
Array.prototype.random = function () {
var tempArr =[], me = this, t;
while (me.length> 0) {
t = Math.floor(Math.random() * me.length);
tempArr[tempArr.length] = me[t];
me =me.deleteAt(t);
}
return tempArr;
}
Array.prototype.orderRandom = function () {
return this.sort(function () {
return Math.random() > 0.5 ? "-1" : "1";
});
}
/** 數字數組排序 **/
Array.prototype.sortNum = function (i) {
if (!i) {
i = 0;
}
if (i == 1) {
return this.sort(function (a, b) {
return b - a;
});
}
return this.sort(function (a, b) {
return a - b;
});
}
/** 獲取數字數組中的最大項 **/
Array.prototype.getMax = function () {
return this.sortNum(1)[0];
}
/** 獲取數字數組中的最小項 **/
Array.prototype.getMin = function () {
return this.sortNum(0)[0];
}
/** 數組第一次出現指定元素的位置 **/
Array.prototype.indexOf = function (o) {
for (var i = 0; i < this.length;i++) {
if (this[i] == o) {
return i;
}
}
return -1;
}
/** 去除數組中的重複項 **/
Array.prototype.arrUnique = function () {
var reset =[], done = {};
for (var i = 0; i < this.length;i++) {
var temp = this[i];
if (!done[temp]) {
done[temp] = true;
reset.push(temp);
}
}
return reset;
}