js观察者模式2
2015-10-10 11:29
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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
#div1{ width:100px; height:100px; background:red; position:absolute;}
#div2{ width:100px; height:100px; background:yellow; position:absolute; left:100px;}
#div3{ width:100px; height:100px; background:blue; position:absolute; left:200px;}
#div4{ width:100px; height:100px; background:green; position:absolute; left:300px;}
</style>
<script>
//组件开发 : 多组对象，像兄弟之间的关系( 代码复用的一种形式 )
window.onload = function(){
var d1 = new Drag();
d1.init({ //配置参数
id : 'div1'
});
var d2 = new Drag();
d2.init({ //配置参数
id : 'div2'
});
bindEvent(d2 ,'toDown',function(){
document.title = 'hello';
});
bindEvent(d2 ,'toDown',function(){
document.body.style.background = 'black';
});
var d3 = new Drag();
d3.init({ //配置参数
id : 'div3'
});
bindEvent(d3 ,'toDown',function(){
document.title = '妙味';
});
bindEvent(d3 ,'toUp',function(){
document.title = '课堂';
});
var d4 = new Drag();
d4.init({ //配置参数
id : 'div4'
});
bindEvent(d4 ,'toUp',function(){
document.title = 'byebye';
});
};
function Drag(){
this.obj = null;
this.disX = 0;
this.disY = 0;
this.settings = { //默认参数
};
}
Drag.prototype.init = function(opt){
var This = this;
this.obj = document.getElementById(opt.id);
extend( this.settings , opt );
this.obj.onmousedown = function(ev){
var ev = ev || window.event;
This.fnDown(ev);
fireEvent(This , 'toDown');
document.onmousemove = function(ev){
var ev = ev || window.event;
This.fnMove(ev);
};
document.onmouseup = function(){
This.fnUp();
fireEvent(This , 'toUp');
};
return false;
};
};
Drag.prototype.fnDown = function(ev){
this.disX = ev.clientX - this.obj.offsetLeft;
this.disY = ev.clientY - this.obj.offsetTop;
};
Drag.prototype.fnMove = function(ev){
this.obj.style.left = ev.clientX - this.disX + 'px';
this.obj.style.top = ev.clientY - this.disY + 'px';
};
Drag.prototype.fnUp = function(){
document.onmousemove = null;
document.onmouseup = null;
};
function bindEvent(obj,events,fn){
//obj : 楼层
//events : 书架
//fn : 一本书
obj.listeners = obj.listeners || {};
obj.listeners[events] = obj.listeners[events] || [];
obj.listeners[events].push( fn );
//console.log(obj.listeners[events]);
if(obj.nodeType){//可有可无的一段代码，当obj不是dom元素时
if(obj.addEventListener){
obj.addEventListener(events,fn,false);
}
else{
obj.attachEvent('on'+events,fn);
}
}
}
function fireEvent(obj,events){ //主动触发自定义事件
if(obj.listeners && obj.listeners[events]){
for(var i=0;i<obj.listeners[events].length;i++){
obj.listeners[events][i]();
}
}
}
function extend(obj1,obj2){
for(var attr in obj2){
obj1[attr] = obj2[attr];
}
}
</script>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
<div id="div3"></div>
<div id="div4"></div>
</body>
</html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
#div1{ width:100px; height:100px; background:red; position:absolute;}
#div2{ width:100px; height:100px; background:yellow; position:absolute; left:100px;}
#div3{ width:100px; height:100px; background:blue; position:absolute; left:200px;}
#div4{ width:100px; height:100px; background:green; position:absolute; left:300px;}
</style>
<script>
//组件开发 : 多组对象，像兄弟之间的关系( 代码复用的一种形式 )
window.onload = function(){
var d1 = new Drag();
d1.init({ //配置参数
id : 'div1'
});
var d2 = new Drag();
d2.init({ //配置参数
id : 'div2'
});
bindEvent(d2 ,'toDown',function(){
document.title = 'hello';
});
bindEvent(d2 ,'toDown',function(){
document.body.style.background = 'black';
});
var d3 = new Drag();
d3.init({ //配置参数
id : 'div3'
});
bindEvent(d3 ,'toDown',function(){
document.title = '妙味';
});
bindEvent(d3 ,'toUp',function(){
document.title = '课堂';
});
var d4 = new Drag();
d4.init({ //配置参数
id : 'div4'
});
bindEvent(d4 ,'toUp',function(){
document.title = 'byebye';
});
};
function Drag(){
this.obj = null;
this.disX = 0;
this.disY = 0;
this.settings = { //默认参数
};
}
Drag.prototype.init = function(opt){
var This = this;
this.obj = document.getElementById(opt.id);
extend( this.settings , opt );
this.obj.onmousedown = function(ev){
var ev = ev || window.event;
This.fnDown(ev);
fireEvent(This , 'toDown');
document.onmousemove = function(ev){
var ev = ev || window.event;
This.fnMove(ev);
};
document.onmouseup = function(){
This.fnUp();
fireEvent(This , 'toUp');
};
return false;
};
};
Drag.prototype.fnDown = function(ev){
this.disX = ev.clientX - this.obj.offsetLeft;
this.disY = ev.clientY - this.obj.offsetTop;
};
Drag.prototype.fnMove = function(ev){
this.obj.style.left = ev.clientX - this.disX + 'px';
this.obj.style.top = ev.clientY - this.disY + 'px';
};
Drag.prototype.fnUp = function(){
document.onmousemove = null;
document.onmouseup = null;
};
function bindEvent(obj,events,fn){
//obj : 楼层
//events : 书架
//fn : 一本书
obj.listeners = obj.listeners || {};
obj.listeners[events] = obj.listeners[events] || [];
obj.listeners[events].push( fn );
//console.log(obj.listeners[events]);
if(obj.nodeType){//可有可无的一段代码，当obj不是dom元素时
if(obj.addEventListener){
obj.addEventListener(events,fn,false);
}
else{
obj.attachEvent('on'+events,fn);
}
}
}
function fireEvent(obj,events){ //主动触发自定义事件
if(obj.listeners && obj.listeners[events]){
for(var i=0;i<obj.listeners[events].length;i++){
obj.listeners[events][i]();
}
}
}
function extend(obj1,obj2){
for(var attr in obj2){
obj1[attr] = obj2[attr];
}
}
</script>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
<div id="div3"></div>
<div id="div4"></div>
</body>
</html>
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