使用
- <script language=javascript>
- var isNumeric = function(x) {
- // returns true if x is numeric and false if it is not.
- var RegExp = /^(-)?(\d*)(\.?)(\d*)$/;
- return String(x).match(RegExp);
- }
- var myArray = [1,'two',3,'four',5,'six',7,'eight',9,'ten'];
- var oddArray=myArray.filter(isNumeric); // outputs: 1,3,5,7,9
- var oddArray=myArray.some(isNumeric); // outputs: true
- var oddArray=myArray.every(isNumeric); // outputs: false
- var printArray =function(x, idx){
- document.writeln('['+idx+'] = '+x);
- }
- myArray.forEach(printArray);// outputs: [0] = 1 [1] = two [2] = 3 [3] = four [4] = 5
- myArray.remove(9);
- document.writeln(myArray);
- if (!Array.prototype.every)
- {
- Array.prototype.every = function(fun /*, thisp*/)
- {
- var len = this.length;
- if (typeof fun != "function")
- throw new TypeError();
- var thisp = arguments[1];
- for (var i = 0; i < len; i++)
- {
- if (i in this &&
- !fun.call(thisp, this[i], i, this))
- return false;
- }
- return true;
- };
- }
- if (!Array.prototype.filter)
- {
- Array.prototype.filter = function(fun /*, thisp*/)
- {
- var len = this.length;
- if (typeof fun != "function")
- throw new TypeError();
- var res = new Array();
- var thisp = arguments[1];
- for (var i = 0; i < len; i++)
- {
- if (i in this)
- {
- var val = this[i]; // in case fun mutates this
- if (fun.call(thisp, val, i, this))
- res.push(val);
- }
- }
- return res;
- };
- }
- if (!Array.prototype.forEach)
- {
- Array.prototype.forEach = function(fun /*, thisp*/)
- {
- var len = this.length;
- if (typeof fun != "function")
- throw new TypeError();
- var thisp = arguments[1];
- for (var i = 0; i < len; i++)
- {
- if (i in this)
- fun.call(thisp, this[i], i, this);
- }
- };
- }
- if (!Array.prototype.map)
- {
- Array.prototype.map = function(fun /*, thisp*/)
- {
- var len = this.length;
- if (typeof fun != "function")
- throw new TypeError();
- var res = new Array(len);
- var thisp = arguments[1];
- for (var i = 0; i < len; i++)
- {
- if (i in this)
- res[i] = fun.call(thisp, this[i], i, this);
- }
- return res;
- };
- }
- if (!Array.prototype.some)
- {
- Array.prototype.some = function(fun /*, thisp*/)
- {
- var len = this.length;
- if (typeof fun != "function")
- throw new TypeError();
- var thisp = arguments[1];
- for (var i = 0; i < len; i++)
- {
- if (i in this &&
- fun.call(thisp, this[i], i, this))
- return true;
- }
- return false;
- };
- }
- Array.prototype.sortNum = function() {
- return this.sort( function (a,b) { return a-b; } );
- }
- <!--
- var tmp = [5,9,12,18,56,1,10,42,'blue',30, 7,97,53,33,30,35,27,30,'35','Ball', 'bubble'];
- var thirty=tmp.find(30); // Returns 9, 14, 17
- var thirtyfive=tmp.find('35'); // Returns 18
- var thirtyfive=tmp.find(35); // Returns 15
- var haveBlue=tmp.find('blue'); // Returns 8
- var notFound=tmp.find('not there!'); // Returns false
- var regexp1=tmp.find(/^b/); // returns 8,20 (first letter starts with b)
- var regexp1=tmp.find(/^b/i); // returns 8,19,20 (same as above but ignore case)
- -->
- Array.prototype.find = function(searchStr) {
- var returnArray = false;
- for (i=0; i<this.length; i++) {
- if (typeof(searchStr) == 'function') {
- if (searchStr.test(this[i])) {
- if (!returnArray) { returnArray = [] }
- returnArray.push(i);
- }
- } else {
- if (this[i]===searchStr) {
- if (!returnArray) { returnArray = [] }
- returnArray.push(i);
- }
- }
- }
- return returnArray;
- }
- //随机改变数组的排序
- Array.prototype.shuffle = function (){
- for(var rnd, tmp, i=this.length; i; rnd=parseInt(Math.random()*i), tmp=this[--i], this[i]=this[rnd], this[rnd]=tmp);
- return this;
- }
- <!--var myArray = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15];
- var yourArray = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15];
- document.writeln(myArray.compare(yourArray)); // outputs: true;-->
- Array.prototype.compare = function(testArr) {
- if (this.length != testArr.length) return false;
- for (var i = 0; i < testArr.length; i++) {
- if (this[i].compare) {
- if (!this[i].compare(testArr[i])) return false;
- }
- if (this[i] !== testArr[i]) return false;
- }
- return true;
- }
- //去掉数组中重复的值var a = new Array("5","7","7"); a.unique();
- Array.prototype.unique = function() {
- var data = this || [];
- var a = {}; //声明一个对象,javascript的对象可以当哈希表用
- for (var i = 0; i < data.length; i++) {
- a[data[i]] = true; //设置标记,把数组的值当下标,这样就可以去掉重复的值
- }
- data.length = 0;
- for (var i in a) { //遍历对象,把已标记的还原成数组
- this[data.length] = i;
- }
- return data;
- }
- Array.prototype.addAll = function($array)
- {
- if($array == null || $array.length == 0)
- return;
- for(var $i=0; $i<$array.length; $i++)
- this.push($array[$i]);
- }
- Array.prototype.contains = function($value)
- {
- for(var $i=0; $i<this.length; $i++)
- {
- var $element = this[$i];
- if($element == $value)
- return true;
- }
- return false;
- }
- Array.prototype.indexOf = function($value)
- {
- for(var $i=0; $i<this.length; $i++)
- {
- if(this[$i] == $value)
- return $i;
- }
- return -1;
- }
- if (!Array.prototype.lastIndexOf)
- {
- Array.prototype.lastIndexOf = function(elt /*, from*/)
- {
- var len = this.length;
- var from = Number(arguments[1]);
- if (isNaN(from))
- {
- from = len - 1;
- }
- else
- {
- from = (from < 0)
- ? Math.ceil(from)
- : Math.floor(from);
- if (from < 0)
- from += len;
- else if (from >= len)
- from = len - 1;
- }
- for (; from > -1; from--)
- {
- if (from in this &&
- this[from] === elt)
- return from;
- }
- return -1;
- };
- }
- Array.prototype.insertAt = function($value, $index)
- {
- if($index < 0)
- this.unshift($value);
- else if($index >= this.length)
- this.push($value);
- else
- this.splice($index, 0, $value);
- }
- /**
- * 根据数组的下标来删除元素
- */
- Array.prototype.removeByIndex=function($n) {
- if($n<0){ //如果n<0,则不进行任何操作。
- return this;
- }else{
- return this.slice(0,$n).concat(this.slice($n+1,this.length));
- }
- }
- //依赖indexOf
- Array.prototype.remove = function($value)
- {
- var $index = this.indexOf($value);
- if($index != -1)
- this.splice($index, 1);
- }
- Array.prototype.removeAll = function()
- {
- while(this.length > 0)
- this.pop();
- }
- Array.prototype.replace = function($oldValue, $newValue)
- {
- for(var $i=0; $i<this.length; $i++)
- {
- if(this[$i] == $oldValue)
- {
- this[$i] = $newValue;
- return;
- }
- }
- }
- Array.prototype.swap = function($a, $b)
- {
- if($a == $b)
- return;
- var $tmp = this[$a];
- this[$a] = this[$b];
- this[$b] = $tmp;
- }
- Array.prototype.max = function() {
- return Math.max.apply({}, this);
- }
- Array.prototype.min = function() {
- return Math.min.apply({}, this);
- }
- Array.prototype.splice = function(start, delLen, item){
- var len =this.length;
- start = start<0?0:start>len?len:start?start:0;
- delLen=delLen<0?0:delLen>len?len:delLen?delLen:len;
- var arr =[],res=[];
- var iarr=0,ires=0,i=0;
- for(i=0;i<len;i++){
- if(i<start|| ires>=delLen) arr[iarr++]=this[i];
- else {
- res[ires++]=this[i];
- if(item&&ires==delLen){
- arr[iarr++]=item;
- }
- }
- }
- if(item&&ires<delLen) arr[iarr]=item;
- for(var i=0;i<arr.length;i++){
- this[i]=arr[i];
- }
- this.length=arr.length;
- return res;
- }
- Array.prototype.shift = function(){ if(!this) return[];return this.splice(0,1)[0];}
- //分开添加,关键字shallow copy,如果遇到数组,复制数组中的元素
- Array.prototype.concat = function(){
- var i=0;
- while(i<arguments.length){
- if(typeof arguments[i] === 'object'&&typeof arguments[i].splice ==='function' &&!arguments[i].propertyIsEnumerable('length')){
- // NOT SHALLOW COPY BELOW
- // Array.prototype.concat.apply(this,arguments[i++]);
- var j=0;
- while(j<arguments[i].length) this.splice(this.length,0,arguments[i][j++]);
- i++;
- } else{
- this[this.length]=arguments[i++];
- }
- }
- return this;
- }
- Array.prototype.join = function(separator){
- var i=0,str="";
- while(i<this.length) str+=this[i++]+separator;
- return str;
- }
- Array.prototype.pop = function() { return this.splice(this.length-1,1)[0];}
- Array.prototype.push = function(){
- Array.prototype.splice.apply(this,
- [this.length,0].concat(Array.prototype.slice.apply(arguments))); //这里没有直接处理参数,而是复制了一下
- return this.length;
- }
- Array.prototype.reverse = function(){
- for(var i=0;i<this.length/2;i++){
- var temp = this[i];
- this[i]= this[this.length-1-i];
- this[this.length-1-i] = temp;
- }
- return this;
- }
- Array.prototype.slice = function(start, end){
- var len =this.length;
- start=start<0?start+=len:start?start:0;
- end =end<0?end+=len:end>len?len:end?end:len;
- var i=start;
- var res = [];
- while(i<end){
- res.push(this[i++]);
- }
- return res;
- }
- //arr.unshift(ele1,ele2,ele3....)
- Array.prototype.unshift =function(){
- Array.prototype.splice.apply(this,[0,0].concat(Array.prototype.slice.apply(this,arguments)));
- }