效果圖：
代碼：
var calculator = function(obj){
this.obj = obj;
this.maxValue = obj.maxValue;
this.minValue = obj.minValue;
this.operationSymbol = obj.operationSymbol;
this.increasing = obj.increasing;
this.init(); //Initialization function
};
calculator.prototype = {
constructor : this,
init : function(){
var _this = this;
if(_this.obj.obj.val() > _this.maxValue || isNaN(_this.obj.obj.val()) != false){
_this.obj.obj.val(_this.maxValue);
return;
}
switch(_this.operationSymbol){
case 'plus':
_this.plus(_this.obj, _this.increasing);
break;
case 'minus':
_this.minus(_this.obj, _this.increasing);
break;
case 'times':
_this.times(_this.obj, _this.increasing);
break;
case 'divide':
_this.divide(_this.obj, _this.increasing);
break;
defaults :
break;
}
},
plus : function(obj,increasing){
var puls_this = this;
puls_this.initValue = parseInt(obj.obj.val());
if(puls_this.initValue >= puls_this.minValue && puls_this.initValue != puls_this.maxValue && isNaN(puls_this.initValue)==false){
obj.obj.val(parseInt(puls_this.initValue + puls_this.increasing));
}
},
minus : function(obj,increasing){
var minus_this = this;
minus_this.initValue = obj.obj.val();
if(minus_this.initValue != minus_this.minValue && isNaN(minus_this.initValue)==false)
obj.obj.val(parseInt(minus_this.initValue - minus_this.increasing));
},
times : function(obj,increasing){
var times_this = this;
times_this.initValue = obj.obj.val();
if(isNaN(times_this.initValue)==false)
obj.obj.val(parseInt(times_this.initValue * times_this.increasing));
},
divide : function(obj,increasing){
var divide_this = this;
divide_this.initValue = obj.obj.val();
if(isNaN(divide_this.initValue) == false)
obj.obj.val(parseInt(divide_this.initValue / divide_this.increasing));
}
};
window.calculator = calculator;
