https://www.posteitaliane.it/contratti/app/prototypes.js

1
2	//SET STYLE IN JS
3var UID = {
4	_current: 0,
5	getNew: function(){
6		this._current++;
7		return this._current;
8	}
9};
10
11HTMLElement.prototype.pseudoStyle = function(element,prop,value){
12	
13	var _this = this;
14	var _sheetId = "pseudoStyles";
15	var _head = document.head || document.getElementsByTagName('head')[0];
16	var _sheet = document.getElementById(_sheetId) || document.createElement('style');
17	_sheet.id = _sheetId;
18	var className = "pseudoStyle" + UID.getNew();
19	
20	_this.className +=  " "+className; 
21	
22	_sheet.innerHTML += " ."+className+":"+element+"{"+prop+":"+value+"}";
23	_head.appendChild(_sheet);
24	return this;
25};
26
27//SUM OF ARRAY BJECT PROPERTY
28Array.prototype.sum = function (prop) {
29    var total = 0
30    for ( var i = 0, _len = this.length; i < _len; i++ ) {
31        total += parseInt(this[i][prop])
32    }
33    return total
34};
35
36//OBJECT FOREACH
37Object.defineProperty(Object.prototype, 'forEach', {
38	value: function (callback) {
39	
40		for(key in this) {
41		
42			if(this.hasOwnProperty(key)) {
43				callback(this[key], key, this);
44			}
45		}
46	}
47});