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Flyweight.html
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Flyweight.html
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<html><head><title>Flyweight-享元模式</title><meta charset="utf-8"></head>
<body>
<style type="text/css">
.month{width: 200px;height:150px;padding:10px;border: 1px solid green; float: left;margin-right: 5px;margin-bottom: 5px;}
.day{width: 15px;border: 1px solid green;float: left;margin-right: 5px;margin-bottom: 5px;padding: 2px;text-align: center;}
</style>
<script type="text/javascript">
var MyNamespace = window.MyNamespace || {};
// 定义在calendar模块
MyNamespace.calendar = (function(){
function Day(){}
Day.prototype = {
getDom: function(num){
var element = document.createElement('div');
element.className = 'day';
var text = document.createTextNode(num);
element.appendChild(text);
return element;
}
}
var flyWeightDay = new Day();
function Year(year, parent) {
this.element;
this.parent = parent;
this.isLeapYear = !(year%400) || (!(year%4) && (year%100));
this.months = [];
for(var i = 0; i < 12; i++){
this.months.push(new Month(i, this.isLeapYear));
}
this.buildDom();
}
Year.prototype = {
buildDom: function(parent){
this.element = document.createElement('div');
this.element.className = 'year';
for(var i = 0; i < this.months.length; i++){
var month = this.months[i];
month.buildDom();
this.element.appendChild(month.getDom());
}
this.parent.appendChild(this.element);
}
}
function Month(month, isLeapYear){
this.days = [];
this.element;
this.numDay;
switch(month){
case 0:
this.numDay = 31;
break;
case 1:
this.numDay = isLeapYear?29:28;
break;
case 2:
this.numDay = 31;
break;
case 3:
this.numDay = 30;
break;
case 4:
this.numDay = 31;
break;
case 5:
this.numDay = 30;
break;
case 6:
this.numDay = 31;
break;
case 7:
this.numDay = 31;
break;
case 8:
this.numDay = 30;
break;
case 9:
this.numDay = 31;
break;
case 10:
numDay = 30;
break;
case 11:
this.numDay = 31;
break;
}
}
Month.prototype = {
buildDom: function(){
this.element = document.createElement('div');
this.element.className = 'month';
for(var i = 0; i < this.numDay; i++){
this.element.appendChild(flyWeightDay.getDom(i+1));
}
},
getDom: function(){
return this.element;
}
}
return {
Year:Year
}
})();
window.onload = function(){
var body = document.getElementsByTagName('body')[0];
new MyNamespace.calendar.Year(2004, body);
}
/******************************************************
* 非享元版：使用了几百个Day对象，占用内存很大
***************************************/
// var MyNamespace = window.MyNamespace || {};
// // 定义在calendar模块
// MyNamespace.calendar = (function(){
// function Year(year, parent) {
// this.element;
// this.parent = parent;
// this.isLeapYear = !(year%400) || (!(year%4) && (year%100));
// this.months = [];
// for(var i = 0; i < 12; i++){
// this.months.push(new Month(i, this.isLeapYear));
// }
// this.buildDom();
// }
// Year.prototype = {
// buildDom: function(parent){
// this.element = document.createElement('div');
// this.element.className = 'year';
// for(var i = 0; i < this.months.length; i++){
// var month = this.months[i];
// month.buildDom();
// this.element.appendChild(month.getDom());
// }
// this.parent.appendChild(this.element);
// }
// }
// function Month(month, isLeapYear){
// this.days = [];
// this.element;
// var numDay;
// switch(month){
// case 0:
// numDay = 31;
// break;
// case 1:
// numDay = isLeapYear?29:28;
// break;
// case 2:
// numDay = 31;
// break;
// case 3:
// numDay = 30;
// break;
// case 4:
// numDay = 31;
// break;
// case 5:
// numDay = 30;
// break;
// case 6:
// numDay = 31;
// break;
// case 7:
// numDay = 31;
// break;
// case 8:
// numDay = 30;
// break;
// case 9:
// numDay = 31;
// break;
// case 10:
// numDay = 30;
// break;
// case 11:
// numDay = 31;
// break;
// }
// for(var i = 1; i <= numDay; i++){
// this.days.push(new Day(i));
// }
// }
// Month.prototype = {
// buildDom: function(){
// this.element = document.createElement('div');
// this.element.className = 'month';
// for(var i = 0; i < this.days.length; i++){
// var day = this.days[i];
// day.buildDom();
// this.element.appendChild(day.getDom());
// }
// },
// getDom: function(){
// return this.element;
// }
// }
// function Day(num){
// this.num = num;
// this.element;
// }
// Day.prototype = {
// buildDom: function(){
// this.element = document.createElement('div');
// this.element.className = 'day';
// var text = document.createTextNode(this.num);
// this.element.appendChild(text);
// },
// getDom: function(){
// return this.element;
// }
// }
// return {
// Year:Year
// }
// })();
// window.onload = function(){
// var body = document.getElementsByTagName('body')[0];
// new MyNamespace.calendar.Year(2004, body);
// }
</script>
</body>
</html>