Extension function code of js Array object_javascript skills-JS Tutorial-php.cn

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复制代码 代码如下: 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);

复制代码 代码如下: 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 { 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 { 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 res = new Array(len); var thisp = arguments[1]; for (var i = 0; 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 { 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 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 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 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 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; $i this.push($array[$i]); }

Array.prototype.contains = function($value) { for(var $i=0; $i { var $element = this[$i]; if($element == $value) return true; }

return false; }

Array.prototype.indexOf = function($value) { for(var $i=0; $i { if(this[$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 ? Math.ceil(from) : Math.floor(from); if (from 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 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($n return this; }else{ return this.slice(0,$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; $i { if(this[$i] == $oldValue) { this[$i] = $newValue; return; } } }

Array.prototype.swap = function($a, $b) { if($a == $b) return;

var arr =[],res=[]; var iarr=0,ires=0,i=0;

for(i=0;i if(i =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 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 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 i++; } else{ this[this.length]=arguments[i++]; } } return this; }

Array.prototype.join = function(separator){ var i=0,str=""; while(i 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 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 end =end len?len:end?end:len;

var i=start; var res = []; while(i 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))); }