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发表时间：2011-04-22
截图 :
cal.js
var Class = {} ;
Class.calculation = function(){
var calculation = {} ;
calculation.result = 0 ;
calculation.calculate = function(num1,num2){} ;
calculation.getResult = function(){
return this.result ;
} ;
return calculation ;
} ;
Class.add = function(){
var add = Class.calculation() ;
add.calculate = function(num1,num2){
this.result = num1 + num2 ;
} ;
return add ;
}
Class.subtraction = function(){
var subtraction = Class.calculation() ;
subtraction.calculate = function(num1,num2){
this.result = num1 - num2 ;
} ;
return subtraction ;
}
Class.multiply = function(){
var multiply = Class.calculation() ;
multiply.calculate = function(num1,num2){
this.result = num1 * num2 ;
} ;
return multiply ;
}
Class.divide = function(){
var divide = Class.calculation() ;
divide.calculate = function(num1,num2){
this.result = num1 / num2 ;
} ;
return divide ;
}
Class.calculator = function(num1,num2,op){
var obj = null ;
var num1 = parseInt(num1) || 0 ;
var num2 = parseInt(num2) || 0 ;
if("+" == op){
obj = Class.add() ;
}
else if("-" == op){
obj = Class.subtraction() ;
}
else if("*" == op){
obj = Class.multiply() ;
}
else if("/" == op){
if(0 == num2){
alert("除数不能为零!") ;
return ;
}
obj = Class.divide() ;
}
else{
alert("无效的" + op + "操作符!") ;
return ;
}
obj.calculate(num1,num2) ;
alert("计算结果:" + obj.getResult()) ;
}
测试 :
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>JavaScript面向对象</TITLE>
<script type="text/javascript" src="js-lib/cal.js"></script>
<script type="text/javascript">
window.onload = function(){
document.getElementById("command").onclick = function(){
var n1 = document.getElementById("n1").value ;
var opera = document.getElementById("opera").value ;
var n2 = document.getElementById("n2").value ;
Class.calculator(n1,n2,opera) ;
}
} ;
</script>
</HEAD>
<BODY>
操作数1 : <input type="text" id="n1" /></br></br>
操作符号 : <input size="4" type="text" id="opera" /></br></br>
操作数2 : <input type="text" id="n2" /></br></br>
<input type="button" id="command" value="计算" />
</BODY>
</HTML>
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